Topic 12 Practice Test 3 covers Single-Area OSPFv2 and FHRP for Cisco Certified Network Associate 200-301 CCNA and maps to objectives 3.4–3.5. For broader exam preparation, review the Cisco CCNA 200-301 Exam Dumps. Every option includes focused technical reasoning explaining both the networking concept and its fit to the scenario.
Question 1
After a Pioneer change, OSPF hellos are visible in both directions but the interfaces are configured for different areas. What prevents adjacency? Choose ONE.
- OSPF process ID
- OSPF area ID
- HSRP group number
- Device hostname
Correct Answer: B
Correct Answer
Answer B is correct because OSPF neighbors on a link must agree on the area assignment; an area mismatch prevents them from becoming adjacent. For CHG-9199 at Pioneer, the implementation engineer checks Pioneer’s protocol state; CHG-9199 is judged from the observable result at Pioneer. For CHG-9199, this choice fits Pioneer: the implementation engineer gets the required Pioneer outcome and can verify CHG-9199 directly.
Incorrect Answers
Answer A is incorrect because The locally configured process ID does not have to match between routers. For CHG-9199 at Pioneer, the implementation engineer checks Pioneer’s protocol state; CHG-9199 is judged from the observable result at Pioneer. For CHG-9199, this choice fails Pioneer: the implementation engineer leaves the required Pioneer condition unmet and, under t12-pt3-q01, should reject it for chg-9199.
Answer D is incorrect because Hostnames are not exchanged as an OSPF adjacency parameter. For CHG-9199 at Pioneer, the implementation engineer checks Pioneer’s protocol state; CHG-9199 is judged from the observable result at Pioneer. For CHG-9199, this choice fails Pioneer: the implementation engineer leaves the required Pioneer condition unmet and, under t12-pt3-q01, should reject it for chg-9199.
Answer C is incorrect because HSRP group numbering is independent of OSPF neighbor formation. For CHG-9199 at Pioneer, the implementation engineer checks Pioneer’s protocol state; CHG-9199 is judged from the observable result at Pioneer. For CHG-9199, this choice fails Pioneer: the implementation engineer leaves the required Pioneer condition unmet and, under t12-pt3-q01, should reject it for chg-9199.
Question 2
A Summit OSPF link returns to FULL after both sides are configured with identical hello and dead timers. What requirement was restored? Choose ONE.
- Use the same interface description text
- Make the OSPF process IDs identical
- Make the OSPF hello and dead intervals compatible on both ends
- Make the router hostnames identical
Correct Answer: C
Correct Answer
Answer C is correct because OSPF neighbor formation requires matching timer values on a shared network so both routers agree on liveness expectations. For CHG-9216 at Summit, the deployment lead checks Summit’s protocol state; CHG-9216 is judged from the observable result at Summit. For CHG-9216, this choice fits Summit: the deployment lead gets the required Summit outcome and can verify CHG-9216 directly.
Incorrect Answers
Answer B is incorrect because Process IDs are locally significant and need not match. For CHG-9216 at Summit, the deployment lead checks Summit’s protocol state; CHG-9216 is judged from the observable result at Summit. For CHG-9216, this choice fails Summit: the deployment lead leaves the required Summit condition unmet and, under t12-pt3-q02, should reject it for chg-9216.
Answer D is incorrect because OSPF does not require identical hostnames. For CHG-9216 at Summit, the deployment lead checks Summit’s protocol state; CHG-9216 is judged from the observable result at Summit. For CHG-9216, this choice fails Summit: the deployment lead leaves the required Summit condition unmet and, under t12-pt3-q02, should reject it for chg-9216.
Answer A is incorrect because Descriptions are operational labels and do not participate in OSPF adjacency formation. For CHG-9216 at Summit, the deployment lead checks Summit’s protocol state; CHG-9216 is judged from the observable result at Summit. For CHG-9216, this choice fails Summit: the deployment lead leaves the required Summit condition unmet and, under t12-pt3-q02, should reject it for chg-9216.
Question 3
A Vector adjacency forms only after the peer addresses are moved into the same IPv4 subnet. Why was that necessary? Choose ONE.
- The peers must have compatible Layer 3 addressing on the shared link
- The routers must use the same router ID
- The routers must use the same OSPF process ID
- The routers must use the same HSRP priority
Correct Answer: A
Correct Answer
Answer A is correct because OSPFv2 neighbors on a normal shared link need mutually reachable interface addressing in the same subnet in addition to compatible OSPF parameters. For CHG-9233 at Vector, the implementation engineer checks Vector’s protocol state; CHG-9233 is judged from the observable result at Vector. For CHG-9233, this choice fits Vector: the implementation engineer gets the required Vector outcome and can verify CHG-9233 directly.
Incorrect Answers
Answer B is incorrect because Router IDs must be unique rather than identical. For CHG-9233 at Vector, the implementation engineer checks Vector’s protocol state; CHG-9233 is judged from the observable result at Vector. For CHG-9233, this choice fails Vector: the implementation engineer leaves the required Vector condition unmet and, under t12-pt3-q03, should reject it for chg-9233.
Answer C is incorrect because Process IDs can differ because they are locally significant. For CHG-9233 at Vector, the implementation engineer checks Vector’s protocol state; CHG-9233 is judged from the observable result at Vector. For CHG-9233, this choice fails Vector: the implementation engineer leaves the required Vector condition unmet and, under t12-pt3-q03, should reject it for chg-9233.
Answer D is incorrect because HSRP priority has no bearing on OSPF neighbor addressing. For CHG-9233 at Vector, the implementation engineer checks Vector’s protocol state; CHG-9233 is judged from the observable result at Vector. For CHG-9233, this choice fails Vector: the implementation engineer leaves the required Vector condition unmet and, under t12-pt3-q03, should reject it for chg-9233.
Question 4
After setting an explicit OSPF router ID at Yarrow, verification shows the intended 32-bit identifier. What did the command control? Choose ONE.
- ip default-gateway
- router-id under the OSPF process
- service timestamps
- standby priority on the LAN interface
Correct Answer: B
Correct Answer
Answer B is correct because An explicitly configured OSPF router ID overrides automatic router-ID selection and gives the process a deterministic identifier. For CHG-9250 at Yarrow, the deployment lead checks Yarrow’s protocol state; CHG-9250 is judged from the observable result at Yarrow. For CHG-9250, this choice fits Yarrow: the deployment lead gets the required Yarrow outcome and can verify CHG-9250 directly.
Incorrect Answers
Answer D is incorrect because HSRP priority selects an HSRP active router and does not define OSPF identity. For CHG-9250 at Yarrow, the deployment lead checks Yarrow’s protocol state; CHG-9250 is judged from the observable result at Yarrow. For CHG-9250, this choice fails Yarrow: the deployment lead leaves the required Yarrow condition unmet and, under t12-pt3-q04, should reject it for chg-9250.
Answer A is incorrect because Default gateway configuration does not set the OSPF router ID. For CHG-9250 at Yarrow, the deployment lead checks Yarrow’s protocol state; CHG-9250 is judged from the observable result at Yarrow. For CHG-9250, this choice fails Yarrow: the deployment lead leaves the required Yarrow condition unmet and, under t12-pt3-q04, should reject it for chg-9250.
Answer C is incorrect because Logging timestamp settings are unrelated to OSPF identity. For CHG-9250 at Yarrow, the deployment lead checks Yarrow’s protocol state; CHG-9250 is judged from the observable result at Yarrow. For CHG-9250, this choice fails Yarrow: the deployment lead leaves the required Yarrow condition unmet and, under t12-pt3-q04, should reject it for chg-9250.
Question 5
After adding a loopback with a higher IPv4 address, Birch expects a future OSPF process restart to select it when no explicit router ID exists. Which rule applies? Choose ONE.
- The lowest physical-interface IPv4 address
- The highest IPv4 address on an up/up loopback interface
- The default route next hop
- The HSRP virtual IP address
Correct Answer: B
Correct Answer
Answer B is correct because Without an explicit router ID, IOS traditionally prefers the highest IPv4 address on an available loopback over physical-interface addresses. For CHG-9267 at Birch, the implementation engineer checks Birch’s protocol state; CHG-9267 is judged from the observable result at Birch. For CHG-9267, this choice fits Birch: the implementation engineer gets the required Birch outcome and can verify CHG-9267 directly.
Incorrect Answers
Answer A is incorrect because The traditional automatic rule does not prefer the lowest physical address when a loopback is available. For CHG-9267 at Birch, the implementation engineer checks Birch’s protocol state; CHG-9267 is judged from the observable result at Birch. For CHG-9267, this choice fails Birch: the implementation engineer leaves the required Birch condition unmet and, under t12-pt3-q05, should reject it for chg-9267.
Answer D is incorrect because An FHRP virtual gateway is not used as the OSPF router ID selection source. For CHG-9267 at Birch, the implementation engineer checks Birch’s protocol state; CHG-9267 is judged from the observable result at Birch. For CHG-9267, this choice fails Birch: the implementation engineer leaves the required Birch condition unmet and, under t12-pt3-q05, should reject it for chg-9267.
Answer C is incorrect because A routing-table next hop is unrelated to OSPF router-ID selection. For CHG-9267 at Birch, the implementation engineer checks Birch’s protocol state; CHG-9267 is judged from the observable result at Birch. For CHG-9267, this choice fails Birch: the implementation engineer leaves the required Birch condition unmet and, under t12-pt3-q05, should reject it for chg-9267.
Question 6
A Elm router becomes DR after its OSPF interface priority is raised above all peers. Which election rule produced that outcome? Choose ONE.
- The router with the highest HSRP priority
- The router with the lowest OSPF cost
- The router with the highest OSPF interface priority
- The router with the lowest router ID regardless of priority
Correct Answer: C
Correct Answer
Answer C is correct because On broadcast and NBMA networks, OSPF elects the highest eligible interface priority first; router ID breaks a priority tie. For CHG-9284 at Elm, the deployment lead checks Elm’s protocol state; CHG-9284 is judged from the observable result at Elm. For CHG-9284, this choice fits Elm: the deployment lead gets the required Elm outcome and can verify CHG-9284 directly.
Incorrect Answers
Answer B is incorrect because Interface cost affects route calculation, not DR election priority. For CHG-9284 at Elm, the deployment lead checks Elm’s protocol state; CHG-9284 is judged from the observable result at Elm. For CHG-9284, this choice fails Elm: the deployment lead leaves the required Elm condition unmet and, under t12-pt3-q06, should reject it for chg-9284.
Answer D is incorrect because Router ID is a tie-breaker after priority, and higher rather than lower ID wins the tie. For CHG-9284 at Elm, the deployment lead checks Elm’s protocol state; CHG-9284 is judged from the observable result at Elm. For CHG-9284, this choice fails Elm: the deployment lead leaves the required Elm condition unmet and, under t12-pt3-q06, should reject it for chg-9284.
Answer A is incorrect because HSRP and OSPF elections are independent mechanisms. For CHG-9284 at Elm, the deployment lead checks Elm’s protocol state; CHG-9284 is judged from the observable result at Elm. For CHG-9284, this choice fails Elm: the deployment lead leaves the required Elm condition unmet and, under t12-pt3-q06, should reject it for chg-9284.
Question 7
Verification at Highland shows a router staying DROTHER despite having the highest router ID because its OSPF priority is 0. Why? Choose ONE.
- It makes the router ineligible for DR or BDR election
- It forces the router to become DR
- It disables OSPF entirely on the interface
- It sets OSPF cost to zero
Correct Answer: A
Correct Answer
Answer A is correct because OSPF priority 0 removes the router from DR/BDR candidacy while still allowing it to participate as a neighbor. For CHG-9301 at Highland, the implementation engineer checks Highland’s protocol state; CHG-9301 is judged from the observable result at Highland. For CHG-9301, this choice fits Highland: the implementation engineer gets the required Highland outcome and can verify CHG-9301 directly.
Incorrect Answers
Answer B is incorrect because Priority 0 has the opposite effect and prevents election. For CHG-9301 at Highland, the implementation engineer checks Highland’s protocol state; CHG-9301 is judged from the observable result at Highland. For CHG-9301, this choice fails Highland: the implementation engineer leaves the required Highland condition unmet and, under t12-pt3-q07, should reject it for chg-9301.
Answer C is incorrect because The interface can still run OSPF and form adjacencies even though it cannot become DR or BDR. For CHG-9301 at Highland, the implementation engineer checks Highland’s protocol state; CHG-9301 is judged from the observable result at Highland. For CHG-9301, this choice fails Highland: the implementation engineer leaves the required Highland condition unmet and, under t12-pt3-q07, should reject it for chg-9301.
Answer D is incorrect because DR election priority and path cost are separate interface parameters. For CHG-9301 at Highland, the implementation engineer checks Highland’s protocol state; CHG-9301 is judged from the observable result at Highland. For CHG-9301, this choice fails Highland: the implementation engineer leaves the required Highland condition unmet and, under t12-pt3-q07, should reject it for chg-9301.
Question 8
A Kodiak engineer tries to troubleshoot the absence of a DR on an OSPF point-to-point link. Which statement resolves the concern? Choose ONE.
- The higher router ID should always become DR
- No DR or BDR is elected on a point-to-point OSPF network
- HSRP must elect the DR instead
- A DR is mandatory on every OSPF network type
Correct Answer: B
Correct Answer
Answer B is correct because Point-to-point OSPF links do not need DR/BDR election because only two peers share the link. For CHG-9318 at Kodiak, the deployment lead checks Kodiak’s protocol state; CHG-9318 is judged from the observable result at Kodiak. For CHG-9318, this choice fits Kodiak: the deployment lead gets the required Kodiak outcome and can verify CHG-9318 directly.
Incorrect Answers
Answer D is incorrect because DR/BDR roles are specific to multiaccess network types such as broadcast and NBMA. For CHG-9318 at Kodiak, the deployment lead checks Kodiak’s protocol state; CHG-9318 is judged from the observable result at Kodiak. For CHG-9318, this choice fails Kodiak: the deployment lead leaves the required Kodiak condition unmet and, under t12-pt3-q08, should reject it for chg-9318.
Answer A is incorrect because Router ID election logic does not create DR roles on a point-to-point network type. For CHG-9318 at Kodiak, the deployment lead checks Kodiak’s protocol state; CHG-9318 is judged from the observable result at Kodiak. For CHG-9318, this choice fails Kodiak: the deployment lead leaves the required Kodiak condition unmet and, under t12-pt3-q08, should reject it for chg-9318.
Answer C is incorrect because HSRP is a first-hop redundancy protocol and does not supply OSPF DR roles. For CHG-9318 at Kodiak, the deployment lead checks Kodiak’s protocol state; CHG-9318 is judged from the observable result at Kodiak. For CHG-9318, this choice fails Kodiak: the deployment lead leaves the required Kodiak condition unmet and, under t12-pt3-q08, should reject it for chg-9318.
Question 9
At Nimbus, DROTHER routers are only 2-WAY with each other but FULL with the DR/BDR. What broadcast-network design does this reflect? Choose ONE.
- Every router forms FULL adjacency with every other router
- A designated router and backup designated router are elected
- Only static routes are exchanged on Ethernet
- HSRP active and standby replace OSPF neighbors
Correct Answer: B
Correct Answer
Answer B is correct because Broadcast OSPF uses DR and BDR roles to centralize adjacency and flooding behavior and reduce the number of full adjacencies required. For CHG-9335 at Nimbus, the implementation engineer checks Nimbus’s protocol state; CHG-9335 is judged from the observable result at Nimbus. For CHG-9335, this choice fits Nimbus: the implementation engineer gets the required Nimbus outcome and can verify CHG-9335 directly.
Incorrect Answers
Answer A is incorrect because Broadcast OSPF deliberately avoids a full-mesh of full adjacencies among all DROTHER routers. For CHG-9335 at Nimbus, the implementation engineer checks Nimbus’s protocol state; CHG-9335 is judged from the observable result at Nimbus. For CHG-9335, this choice fails Nimbus: the implementation engineer leaves the required Nimbus condition unmet and, under t12-pt3-q09, should reject it for chg-9335.
Answer D is incorrect because HSRP default-gateway roles are separate from OSPF database exchange. For CHG-9335 at Nimbus, the implementation engineer checks Nimbus’s protocol state; CHG-9335 is judged from the observable result at Nimbus. For CHG-9335, this choice fails Nimbus: the implementation engineer leaves the required Nimbus condition unmet and, under t12-pt3-q09, should reject it for chg-9335.
Answer C is incorrect because OSPF remains a dynamic link-state protocol on Ethernet and can exchange LSAs through the elected roles. For CHG-9335 at Nimbus, the implementation engineer checks Nimbus’s protocol state; CHG-9335 is judged from the observable result at Nimbus. For CHG-9335, this choice fails Nimbus: the implementation engineer leaves the required Nimbus condition unmet and, under t12-pt3-q09, should reject it for chg-9335.
Question 10
After an OSPF change at Cedar, deployment lead needs a concise list of neighbor router IDs and states. What verification command fits? Choose ONE.
- show standby
- show ip route static
- show ip ospf neighbor
- show spanning-tree
Correct Answer: C
Correct Answer
Answer C is correct because This command displays OSPFv2 neighbors, including neighbor IDs, priorities, states, dead timers, addresses, and interfaces. For CHG-9352 at Cedar, the deployment lead checks Cedar’s protocol state; CHG-9352 is judged from the observable result at Cedar. For CHG-9352, this choice fits Cedar: the deployment lead gets the required Cedar outcome and can verify CHG-9352 directly.
Incorrect Answers
Answer B is incorrect because That filters static routes and does not report OSPF neighbor state. For CHG-9352 at Cedar, the deployment lead checks Cedar’s protocol state; CHG-9352 is judged from the observable result at Cedar. For CHG-9352, this choice fails Cedar: the deployment lead leaves the required Cedar condition unmet and, under t12-pt3-q10, should reject it for chg-9352.
Answer D is incorrect because Spanning Tree verifies Layer 2 loop-prevention state rather than OSPF adjacency. For CHG-9352 at Cedar, the deployment lead checks Cedar’s protocol state; CHG-9352 is judged from the observable result at Cedar. For CHG-9352, this choice fails Cedar: the deployment lead leaves the required Cedar condition unmet and, under t12-pt3-q10, should reject it for chg-9352.
Answer A is incorrect because `show standby` verifies HSRP groups and roles, not OSPF neighbors. For CHG-9352 at Cedar, the deployment lead checks Cedar’s protocol state; CHG-9352 is judged from the observable result at Cedar. For CHG-9352, this choice fails Cedar: the deployment lead leaves the required Cedar condition unmet and, under t12-pt3-q10, should reject it for chg-9352.
Question 11
A Falcon adjacency is FULL even though the two routers use different OSPF process IDs. Why is that valid? Choose ONE.
- No; OSPF process IDs are locally significant
- Yes; process IDs must be identical on every OSPF neighbor
- Yes; process ID must equal the area ID
- No; because HSRP automatically translates the process ID
Correct Answer: A
Correct Answer
Answer A is correct because The process ID identifies a local IOS routing process and is not an adjacency parameter that must match between neighboring routers. For CHG-9369 at Falcon, the implementation engineer checks Falcon’s protocol state; CHG-9369 is judged from the observable result at Falcon. For CHG-9369, this choice fits Falcon: the implementation engineer gets the required Falcon outcome and can verify CHG-9369 directly.
Incorrect Answers
Answer B is incorrect because Matching process IDs are not required for OSPF neighbor formation. For CHG-9369 at Falcon, the implementation engineer checks Falcon’s protocol state; CHG-9369 is judged from the observable result at Falcon. For CHG-9369, this choice fails Falcon: the implementation engineer leaves the required Falcon condition unmet and, under t12-pt3-q11, should reject it for chg-9369.
Answer C is incorrect because Process ID and area ID are separate concepts and can have different values. For CHG-9369 at Falcon, the implementation engineer checks Falcon’s protocol state; CHG-9369 is judged from the observable result at Falcon. For CHG-9369, this choice fails Falcon: the implementation engineer leaves the required Falcon condition unmet and, under t12-pt3-q11, should reject it for chg-9369.
Answer D is incorrect because HSRP has no role in OSPF process-ID handling. For CHG-9369 at Falcon, the implementation engineer checks Falcon’s protocol state; CHG-9369 is judged from the observable result at Falcon. For CHG-9369, this choice fails Falcon: the implementation engineer leaves the required Falcon condition unmet and, under t12-pt3-q11, should reject it for chg-9369.
Question 12
At Indigo, an interface starts sending OSPF hellos after its address matches a `network … area 0` statement. Which configuration mechanism enabled OSPF there? Choose ONE.
- The HSRP virtual network
- Which local interfaces participate in OSPF and the area assigned to them
- The DNS search domain
- A route that is statically installed in the RIB
Correct Answer: B
Correct Answer
Answer B is correct because The IOS OSPF network statement matches local interface addresses with a wildcard and enables the process on matching interfaces in the specified area. For CHG-9386 at Indigo, the deployment lead checks Indigo’s protocol state; CHG-9386 is judged from the observable result at Indigo. For CHG-9386, this choice fits Indigo: the deployment lead gets the required Indigo outcome and can verify CHG-9386 directly.
Incorrect Answers
Answer D is incorrect because The OSPF network statement is not a static routing command. For CHG-9386 at Indigo, the deployment lead checks Indigo’s protocol state; CHG-9386 is judged from the observable result at Indigo. For CHG-9386, this choice fails Indigo: the deployment lead leaves the required Indigo condition unmet and, under t12-pt3-q12, should reject it for chg-9386.
Answer A is incorrect because HSRP virtual gateways are configured on interfaces and are unrelated to OSPF network-statement matching. For CHG-9386 at Indigo, the deployment lead checks Indigo’s protocol state; CHG-9386 is judged from the observable result at Indigo. For CHG-9386, this choice fails Indigo: the deployment lead leaves the required Indigo condition unmet and, under t12-pt3-q12, should reject it for chg-9386.
Answer C is incorrect because DNS domain configuration has no connection to OSPF interface selection. For CHG-9386 at Indigo, the deployment lead checks Indigo’s protocol state; CHG-9386 is judged from the observable result at Indigo. For CHG-9386, this choice fails Indigo: the deployment lead leaves the required Indigo condition unmet and, under t12-pt3-q12, should reject it for chg-9386.
Question 13
Verification at Lumen shows OSPF running on an interface configured with `ip ospf 10 area 0`. What does that command do? Choose ONE.
- standby 10 ip 10.0.0.1
- ip ospf 10 area 0
- ip nat inside
- ip helper-address 10.0.0.1
Correct Answer: B
Correct Answer
Answer B is correct because The interface command directly associates the interface with OSPF process 10 and area 0. For CHG-9403 at Lumen, the implementation engineer checks Lumen’s protocol state; CHG-9403 is judged from the observable result at Lumen. For CHG-9403, this choice fits Lumen: the implementation engineer gets the required Lumen outcome and can verify CHG-9403 directly.
Incorrect Answers
Answer A is incorrect because That enables an HSRP group and virtual IP rather than OSPF. For CHG-9403 at Lumen, the implementation engineer checks Lumen’s protocol state; CHG-9403 is judged from the observable result at Lumen. For CHG-9403, this choice fails Lumen: the implementation engineer leaves the required Lumen condition unmet and, under t12-pt3-q13, should reject it for chg-9403.
Answer D is incorrect because That configures UDP broadcast relay such as DHCP, not OSPF. For CHG-9403 at Lumen, the implementation engineer checks Lumen’s protocol state; CHG-9403 is judged from the observable result at Lumen. For CHG-9403, this choice fails Lumen: the implementation engineer leaves the required Lumen condition unmet and, under t12-pt3-q13, should reject it for chg-9403.
Answer C is incorrect because That marks an interface for NAT translation direction and does not enable OSPF. For CHG-9403 at Lumen, the implementation engineer checks Lumen’s protocol state; CHG-9403 is judged from the observable result at Lumen. For CHG-9403, this choice fails Lumen: the implementation engineer leaves the required Lumen condition unmet and, under t12-pt3-q13, should reject it for chg-9403.
Question 14
After `passive-interface` is applied at Orchid, the connected subnet remains advertised but OSPF hellos stop on that interface. What behavior is being used? Choose ONE.
- Configure HSRP preempt
- Set the OSPF interface priority to 0
- OSPF passive interface
- Disable IP routing
Correct Answer: C
Correct Answer
Answer C is correct because A passive OSPF interface suppresses hello packets and neighbor formation while the connected network can still be advertised by the OSPF process. For CHG-9420 at Orchid, the deployment lead checks Orchid’s protocol state; CHG-9420 is judged from the observable result at Orchid. For CHG-9420, this choice fits Orchid: the deployment lead gets the required Orchid outcome and can verify CHG-9420 directly.
Incorrect Answers
Answer B is incorrect because Priority 0 blocks DR/BDR election but the interface still sends hellos and can form neighbors. For CHG-9420 at Orchid, the deployment lead checks Orchid’s protocol state; CHG-9420 is judged from the observable result at Orchid. For CHG-9420, this choice fails Orchid: the deployment lead leaves the required Orchid condition unmet and, under t12-pt3-q14, should reject it for chg-9420.
Answer D is incorrect because Disabling routing would break the routing function rather than selectively suppress OSPF hellos. For CHG-9420 at Orchid, the deployment lead checks Orchid’s protocol state; CHG-9420 is judged from the observable result at Orchid. For CHG-9420, this choice fails Orchid: the deployment lead leaves the required Orchid condition unmet and, under t12-pt3-q14, should reject it for chg-9420.
Answer A is incorrect because HSRP preemption controls first-hop active-router selection, not OSPF hello transmission. For CHG-9420 at Orchid, the deployment lead checks Orchid’s protocol state; CHG-9420 is judged from the observable result at Orchid. For CHG-9420, this choice fails Orchid: the deployment lead leaves the required Orchid condition unmet and, under t12-pt3-q14, should reject it for chg-9420.
Question 15
After a Redwood interface cost is lowered, OSPF begins preferring that path. Which metric behavior explains the change? Choose ONE.
- The path with lower total OSPF cost
- The path with higher cost
- The path through the HSRP active router regardless of cost
- The path with the higher process ID
Correct Answer: A
Correct Answer
Answer A is correct because OSPF uses cost as its path metric and prefers the lower accumulated cost to the destination. For CHG-9437 at Redwood, the implementation engineer checks Redwood’s protocol state; CHG-9437 is judged from the observable result at Redwood. For CHG-9437, this choice fits Redwood: the implementation engineer gets the required Redwood outcome and can verify CHG-9437 directly.
Incorrect Answers
Answer B is incorrect because Higher OSPF cost is less preferred. For CHG-9437 at Redwood, the implementation engineer checks Redwood’s protocol state; CHG-9437 is judged from the observable result at Redwood. For CHG-9437, this choice fails Redwood: the implementation engineer leaves the required Redwood condition unmet and, under t12-pt3-q15, should reject it for chg-9437.
Answer C is incorrect because HSRP first-hop roles do not override OSPF metric calculation for routed destinations. For CHG-9437 at Redwood, the implementation engineer checks Redwood’s protocol state; CHG-9437 is judged from the observable result at Redwood. For CHG-9437, this choice fails Redwood: the implementation engineer leaves the required Redwood condition unmet and, under t12-pt3-q15, should reject it for chg-9437.
Answer D is incorrect because The local OSPF process ID is not a route-selection metric. For CHG-9437 at Redwood, the implementation engineer checks Redwood’s protocol state; CHG-9437 is judged from the observable result at Redwood. For CHG-9437, this choice fails Redwood: the implementation engineer leaves the required Redwood condition unmet and, under t12-pt3-q15, should reject it for chg-9437.
Question 16
After Union clients are changed to the HSRP virtual IP as their default gateway, failover becomes transparent. Why? Choose ONE.
- The OSPF router ID
- The HSRP virtual IP address
- The DNS server IP address
- The current active router’s physical IP address
Correct Answer: B
Correct Answer
Answer B is correct because HSRP presents a shared virtual gateway IP that remains the host default gateway while active responsibility moves between routers. For CHG-9454 at Union, the deployment lead checks Union’s protocol state; CHG-9454 is judged from the observable result at Union. For CHG-9454, this choice fits Union: the deployment lead gets the required Union outcome and can verify CHG-9454 directly.
Incorrect Answers
Answer D is incorrect because Using a physical address ties clients to one device and defeats transparent FHRP failover. For CHG-9454 at Union, the deployment lead checks Union’s protocol state; CHG-9454 is judged from the observable result at Union. For CHG-9454, this choice fails Union: the deployment lead leaves the required Union condition unmet and, under t12-pt3-q16, should reject it for chg-9454.
Answer A is incorrect because Router ID identifies an OSPF process and is not a host default-gateway address. For CHG-9454 at Union, the deployment lead checks Union’s protocol state; CHG-9454 is judged from the observable result at Union. For CHG-9454, this choice fails Union: the deployment lead leaves the required Union condition unmet and, under t12-pt3-q16, should reject it for chg-9454.
Answer C is incorrect because DNS provides name resolution, not first-hop gateway redundancy. For CHG-9454 at Union, the deployment lead checks Union’s protocol state; CHG-9454 is judged from the observable result at Union. For CHG-9454, this choice fails Union: the deployment lead leaves the required Union condition unmet and, under t12-pt3-q16, should reject it for chg-9454.
Question 17
At Xenon, the standby router takes over only after the active router fails. Which HSRP role was forwarding before the failure? Choose ONE.
- The standby HSRP router
- The active HSRP router
- Every HSRP group member simultaneously
- The OSPF DR
Correct Answer: B
Correct Answer
Answer B is correct because HSRP elects one active device to forward traffic for the virtual gateway, with a standby device ready to assume the role on failure. For CHG-9471 at Xenon, the implementation engineer checks Xenon’s protocol state; CHG-9471 is judged from the observable result at Xenon. For CHG-9471, this choice fits Xenon: the implementation engineer gets the required Xenon outcome and can verify CHG-9471 directly.
Incorrect Answers
Answer A is incorrect because The standby is prepared for failover but does not normally forward traffic on behalf of the virtual gateway while the active device is healthy. For CHG-9471 at Xenon, the implementation engineer checks Xenon’s protocol state; CHG-9471 is judged from the observable result at Xenon. For CHG-9471, this choice fails Xenon: the implementation engineer leaves the required Xenon condition unmet and, under t12-pt3-q17, should reject it for chg-9471.
Answer D is incorrect because OSPF DR status controls LSA exchange on a segment and is independent of HSRP forwarding roles. For CHG-9471 at Xenon, the implementation engineer checks Xenon’s protocol state; CHG-9471 is judged from the observable result at Xenon. For CHG-9471, this choice fails Xenon: the implementation engineer leaves the required Xenon condition unmet and, under t12-pt3-q17, should reject it for chg-9471.
Answer C is incorrect because HSRP normal operation designates a single active forwarder for the virtual gateway rather than all members forwarding identically. For CHG-9471 at Xenon, the implementation engineer checks Xenon’s protocol state; CHG-9471 is judged from the observable result at Xenon. For CHG-9471, this choice fails Xenon: the implementation engineer leaves the required Xenon condition unmet and should reject it for CHG-9471.
Question 18
After raising router A HSRP priority above router B at Aspen, A becomes the preferred active candidate. Which rule is being used? Choose ONE.
- The router with the lower process ID
- Router B with priority 100
- Router A with priority 120
- The router with the lower OSPF cost
Correct Answer: C
Correct Answer
Answer C is correct because HSRP prefers the device with the higher configured priority; the default priority is 100 when no different value is set. For CHG-9488 at Aspen, the deployment lead checks Aspen’s protocol state; CHG-9488 is judged from the observable result at Aspen. For CHG-9488, this choice fits Aspen: the deployment lead gets the required Aspen outcome and can verify CHG-9488 directly.
Incorrect Answers
Answer B is incorrect because A lower HSRP priority is less preferred when other election conditions are equal. For CHG-9488 at Aspen, the deployment lead checks Aspen’s protocol state; CHG-9488 is judged from the observable result at Aspen. For CHG-9488, this choice fails Aspen: the deployment lead leaves the required Aspen condition unmet and should reject it for CHG-9488.
Answer D is incorrect because OSPF cost does not select the HSRP active device. For CHG-9488 at Aspen, the deployment lead checks Aspen’s protocol state; CHG-9488 is judged from the observable result at Aspen. For CHG-9488, this choice fails Aspen: the deployment lead leaves the required Aspen condition unmet and should reject it for CHG-9488.
Answer A is incorrect because OSPF process IDs are unrelated to HSRP election. For CHG-9488 at Aspen, the deployment lead checks Aspen’s protocol state; CHG-9488 is judged from the observable result at Aspen. For CHG-9488, this choice fails Aspen: the deployment lead leaves the required Aspen condition unmet and should reject it for CHG-9488.
Question 19
After HSRP preemption is enabled at Drift, the recovered higher-priority router takes over from a lower-priority active peer. What did preempt change? Choose ONE.
- HSRP preempt
- OSPF passive-interface
- NAT overload
- DHCP relay
Correct Answer: A
Correct Answer
Answer A is correct because Preemption allows a router with a better HSRP priority to take the active role from a currently active lower-priority peer after it becomes eligible. For CHG-9505 at Drift, the implementation engineer checks Drift’s protocol state; CHG-9505 is judged from the observable result at Drift. For CHG-9505, this choice fits Drift: the implementation engineer gets the required Drift outcome and can verify CHG-9505 directly.
Incorrect Answers
Answer B is incorrect because That suppresses OSPF hellos and has no effect on HSRP role reclamation. For CHG-9505 at Drift, the implementation engineer checks Drift’s protocol state; CHG-9505 is judged from the observable result at Drift. For CHG-9505, this choice fails Drift: the implementation engineer leaves the required Drift condition unmet and should reject it for CHG-9505.
Answer C is incorrect because PAT changes address/port translation and does not affect FHRP election. For CHG-9505 at Drift, the implementation engineer checks Drift’s protocol state; CHG-9505 is judged from the observable result at Drift. For CHG-9505, this choice fails Drift: the implementation engineer leaves the required Drift condition unmet and should reject it for CHG-9505.
Answer D is incorrect because DHCP relay forwards client broadcasts and cannot control HSRP active selection. For CHG-9505 at Drift, the implementation engineer checks Drift’s protocol state; CHG-9505 is judged from the observable result at Drift. For CHG-9505, this choice fails Drift: the implementation engineer leaves the required Drift condition unmet and should reject it for CHG-9505.
Question 20
After interface tracking is configured at Grove, an uplink failure causes the HSRP priority to decrement and the peer becomes active. What mechanism produced that failover? Choose ONE.
- Static route recursion
- HSRP interface/object tracking
- DNS caching
- OSPF router-ID selection
Correct Answer: B
Correct Answer
Answer B is correct because Tracking can decrement HSRP priority when an important interface or object fails, allowing a healthier peer to become active. For CHG-9522 at Grove, the deployment lead checks Grove’s protocol state; CHG-9522 is judged from the observable result at Grove. For CHG-9522, this choice fits Grove: the deployment lead gets the required Grove outcome and can verify CHG-9522 directly.
Incorrect Answers
Answer D is incorrect because Router ID does not monitor uplink health for HSRP. For CHG-9522 at Grove, the deployment lead checks Grove’s protocol state; CHG-9522 is judged from the observable result at Grove. For CHG-9522, this choice fails Grove: the deployment lead leaves the required Grove condition unmet and should reject it for CHG-9522.
Answer A is incorrect because Recursive route resolution does not directly adjust HSRP election priority. For CHG-9522 at Grove, the deployment lead checks Grove’s protocol state; CHG-9522 is judged from the observable result at Grove. For CHG-9522, this choice fails Grove: the deployment lead leaves the required Grove condition unmet and should reject it for CHG-9522.
Answer C is incorrect because DNS cache state has no relationship to first-hop redundancy priority. For CHG-9522 at Grove, the deployment lead checks Grove’s protocol state; CHG-9522 is judged from the observable result at Grove. For CHG-9522, this choice fails Grove: the deployment lead leaves the required Grove condition unmet and should reject it for CHG-9522.
