Topic 13 Practice Test 2 covers NAT, NTP, DHCP, and DNS for Cisco Certified Network Associate 200-301 CCNA and maps to objectives 4.1–4.3, 4.6. 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
A Pioneer server must always be reachable through the same public address, with one private address mapped to one global address. What translation model should be used? Choose ONE.
- DNS lookup
- PAT overload
- Dynamic NAT from a pool
- Static NAT
Correct Answer: D
Correct Answer
Answer D is correct because Static NAT creates a configured one-to-one association between an inside local address and an inside global address. For CHG-9891 at Pioneer, the network operations analyst checks Pioneer’s protocol state; CHG-9891 is judged from the observable result at Pioneer. For CHG-9891, this choice fits Pioneer: the network operations analyst gets the required Pioneer outcome and can verify CHG-9891 directly.
Incorrect Answers
Answer C is incorrect because Dynamic NAT assigns available global addresses as sessions require them rather than guaranteeing one permanent mapping. For CHG-9891 at Pioneer, the network operations analyst checks Pioneer’s protocol state; CHG-9891 is judged from the observable result at Pioneer. For CHG-9891, this choice fails Pioneer: the network operations analyst leaves the required Pioneer condition unmet and, under t13-pt2-q01, should reject it for chg-9891.
Answer B is incorrect because PAT commonly multiplexes many inside hosts onto one or a small number of global addresses by differentiating transport-layer ports. For CHG-9891 at Pioneer, the network operations analyst checks Pioneer’s protocol state; CHG-9891 is judged from the observable result at Pioneer. For CHG-9891, this choice fails Pioneer: the network operations analyst leaves the required Pioneer condition unmet and, under t13-pt2-q01, should reject it for chg-9891.
Answer A is incorrect because DNS resolves names and addresses but does not translate packet source addresses at the NAT boundary. For CHG-9891 at Pioneer, the network operations analyst checks Pioneer’s protocol state; CHG-9891 is judged from the observable result at Pioneer. For CHG-9891, this choice fails Pioneer: the network operations analyst leaves the required Pioneer condition unmet and, under t13-pt2-q01, should reject it for chg-9891.
Question 2
A Summit translation pool allocates a public address to an inside host only when needed and returns it later. What type of NAT is this? Choose ONE.
- PAT using one interface address
- DHCP relay
- Static NAT
- Dynamic NAT using an address pool
Correct Answer: D
Correct Answer
Answer D is correct because Dynamic NAT selects an available inside-global address from a configured pool for qualifying inside-local addresses. For CHG-9908 at Summit, the NOC analyst checks Summit’s protocol state; CHG-9908 is judged from the observable result at Summit. For CHG-9908, this choice fits Summit: the NOC analyst gets the required Summit outcome and can verify CHG-9908 directly.
Incorrect Answers
Answer C is incorrect because Static NAT fixes a particular one-to-one mapping rather than allocating any free pool member. For CHG-9908 at Summit, the NOC analyst checks Summit’s protocol state; CHG-9908 is judged from the observable result at Summit. For CHG-9908, this choice fails Summit: the NOC analyst leaves the required Summit condition unmet and, under t13-pt2-q02, should reject it for chg-9908.
Answer A is incorrect because PAT distinguishes many translations with ports and typically allows many hosts to share one global address. For CHG-9908 at Summit, the NOC analyst checks Summit’s protocol state; CHG-9908 is judged from the observable result at Summit. For CHG-9908, this choice fails Summit: the NOC analyst leaves the required Summit condition unmet and, under t13-pt2-q02, should reject it for chg-9908.
Answer B is incorrect because DHCP relay forwards address-assignment broadcasts but is not packet address translation. For CHG-9908 at Summit, the NOC analyst checks Summit’s protocol state; CHG-9908 is judged from the observable result at Summit. For CHG-9908, this choice fails Summit: the NOC analyst leaves the required Summit condition unmet and, under t13-pt2-q02, should reject it for chg-9908.
Question 3
A Vector edge router has one usable public address but many clients need concurrent outbound connections. Which feature conserves addresses by tracking ports? Choose ONE.
- PAT/NAT overload
- Dynamic NAT without overload
- One-to-one static NAT
- NTP client mode
Correct Answer: A
Correct Answer
Answer A is correct because Port Address Translation lets many inside-local sessions share an inside-global address by using transport-layer port identifiers to keep translations distinct. For CHG-9925 at Vector, the network operations analyst checks Vector’s protocol state; CHG-9925 is judged from the observable result at Vector. For CHG-9925, this choice fits Vector: the network operations analyst gets the required Vector outcome and can verify CHG-9925 directly.
Incorrect Answers
Answer C is incorrect because Static NAT consumes a dedicated global address per configured inside local mapping. For CHG-9925 at Vector, the network operations analyst checks Vector’s protocol state; CHG-9925 is judged from the observable result at Vector. For CHG-9925, this choice fails Vector: the network operations analyst leaves the required Vector condition unmet and, under t13-pt2-q03, should reject it for chg-9925.
Answer B is incorrect because Ordinary dynamic NAT generally binds hosts to available pool addresses and does not rely on port multiplexing to make one address serve hundreds concurrently. For CHG-9925 at Vector, the network operations analyst checks Vector’s protocol state; CHG-9925 is judged from the observable result at Vector. For CHG-9925, this choice fails Vector: the network operations analyst leaves the required Vector condition unmet and, under t13-pt2-q03, should reject it for chg-9925.
Answer D is incorrect because NTP synchronizes time and has no address-conservation role. For CHG-9925 at Vector, the network operations analyst checks Vector’s protocol state; CHG-9925 is judged from the observable result at Vector. For CHG-9925, this choice fails Vector: the network operations analyst leaves the required Vector condition unmet and, under t13-pt2-q03, should reject it for chg-9925.
Question 4
A Yarrow host uses 10.1.1.20 internally and appears as 203.0.113.20 externally. Which address is the inside local? Choose ONE.
- The public address representing the inside host externally
- The NAT router’s default gateway only
- The inside host address as it is known on the inside network
- The outside server’s public address
Correct Answer: C
Correct Answer
Answer C is correct because Inside local refers to the address assigned to the internal host from the perspective of the inside network, commonly a private address. For CHG-9942 at Yarrow, the NOC analyst checks Yarrow’s protocol state; CHG-9942 is judged from the observable result at Yarrow. For CHG-9942, this choice fits Yarrow: the NOC analyst gets the required Yarrow outcome and can verify CHG-9942 directly.
Incorrect Answers
Answer A is incorrect because That is the inside global address, not inside local. For CHG-9942 at Yarrow, the NOC analyst checks Yarrow’s protocol state; CHG-9942 is judged from the observable result at Yarrow. For CHG-9942, this choice fails Yarrow: the NOC analyst leaves the required Yarrow condition unmet and, under t13-pt2-q04, should reject it for chg-9942.
Answer D is incorrect because That describes an outside global address, not the internal host. For CHG-9942 at Yarrow, the NOC analyst checks Yarrow’s protocol state; CHG-9942 is judged from the observable result at Yarrow. For CHG-9942, this choice fails Yarrow: the NOC analyst leaves the required Yarrow condition unmet and, under t13-pt2-q04, should reject it for chg-9942.
Answer B is incorrect because Inside local terminology identifies the translated host address, not merely the router gateway. For CHG-9942 at Yarrow, the NOC analyst checks Yarrow’s protocol state; CHG-9942 is judged from the observable result at Yarrow. For CHG-9942, this choice fails Yarrow: the NOC analyst leaves the required Yarrow condition unmet and, under t13-pt2-q04, should reject it for chg-9942.
Question 5
NAT translations at Birch never occur because both interfaces were marked `ip nat inside`. What role should the Internet-facing interface have? Choose ONE.
- Neither interface needs a NAT role
- Both interfaces as `ip nat outside`
- Both interfaces as `ip nat inside`
- LAN as `ip nat inside`; Internet interface as `ip nat outside`
Correct Answer: D
Correct Answer
Answer D is correct because Classic IOS NAT classifies interfaces by translation direction so packets can be interpreted as moving between inside and outside address realms. For CHG-9959 at Birch, the network operations analyst checks Birch’s protocol state; CHG-9959 is judged from the observable result at Birch. For CHG-9959, this choice fits Birch: the network operations analyst gets the required Birch outcome and can verify CHG-9959 directly.
Incorrect Answers
Answer C is incorrect because Without an outside role, classic inside-source NAT lacks the intended boundary classification. For CHG-9959 at Birch, the network operations analyst checks Birch’s protocol state; CHG-9959 is judged from the observable result at Birch. For CHG-9959, this choice fails Birch: the network operations analyst leaves the required Birch condition unmet and, under t13-pt2-q05, should reject it for chg-9959.
Answer B is incorrect because The inside LAN must be identified as inside for inside-source translations. For CHG-9959 at Birch, the network operations analyst checks Birch’s protocol state; CHG-9959 is judged from the observable result at Birch. For CHG-9959, this choice fails Birch: the network operations analyst leaves the required Birch condition unmet and, under t13-pt2-q05, should reject it for chg-9959.
Answer A is incorrect because Classic IOS NAT configuration normally requires inside/outside designation on the participating interfaces. For CHG-9959 at Birch, the network operations analyst checks Birch’s protocol state; CHG-9959 is judged from the observable result at Birch. For CHG-9959, this choice fails Birch: the network operations analyst leaves the required Birch condition unmet and, under t13-pt2-q05, should reject it for chg-9959.
Question 6
Only some Elm LAN subnets should be translated. Which NAT component selects the qualifying inside-local source addresses? Choose ONE.
- The NTP peers
- The HSRP active router only
- The public DNS servers
- The inside source addresses eligible for translation
Correct Answer: D
Correct Answer
Answer D is correct because In common IOS inside-source NAT configuration, an ACL identifies which inside-local source addresses are candidates for the configured translation rule. For CHG-9976 at Elm, the NOC analyst checks Elm’s protocol state; CHG-9976 is judged from the observable result at Elm. For CHG-9976, this choice fits Elm: the NOC analyst gets the required Elm outcome and can verify CHG-9976 directly.
Incorrect Answers
Answer C is incorrect because DNS server selection is unrelated to the NAT source-selection ACL. For CHG-9976 at Elm, the NOC analyst checks Elm’s protocol state; CHG-9976 is judged from the observable result at Elm. For CHG-9976, this choice fails Elm: the NOC analyst leaves the required Elm condition unmet and, under t13-pt2-q06, should reject it for chg-9976.
Answer A is incorrect because NTP peers are configured independently of NAT ACL selection. For CHG-9976 at Elm, the NOC analyst checks Elm’s protocol state; CHG-9976 is judged from the observable result at Elm. For CHG-9976, this choice fails Elm: the NOC analyst leaves the required Elm condition unmet and, under t13-pt2-q06, should reject it for chg-9976.
Answer B is incorrect because An ACL used by NAT is evaluated against traffic addresses, not merely an FHRP role. For CHG-9976 at Elm, the NOC analyst checks Elm’s protocol state; CHG-9976 is judged from the observable result at Elm. For CHG-9976, this choice fails Elm: the NOC analyst leaves the required Elm condition unmet and, under t13-pt2-q06, should reject it for chg-9976.
Question 7
A Highland NAT pool should contain 203.0.113.10 through 203.0.113.20. What must the pool configuration describe? Choose ONE.
- Starting and ending global addresses plus the appropriate netmask or prefix information
- Only an HSRP group number
- Only the inside ACL number
- Only the DNS domain
Correct Answer: A
Correct Answer
Answer A is correct because A dynamic NAT pool defines the inside-global address range and its network mask/prefix so IOS can allocate valid translations. For CHG-9993 at Highland, the network operations analyst checks Highland’s protocol state; CHG-9993 is judged from the observable result at Highland. For CHG-9993, this choice fits Highland: the network operations analyst gets the required Highland outcome and can verify CHG-9993 directly.
Incorrect Answers
Answer C is incorrect because The ACL selects inside sources but does not itself define the public pool address range. For CHG-9993 at Highland, the network operations analyst checks Highland’s protocol state; CHG-9993 is judged from the observable result at Highland. For CHG-9993, this choice fails Highland: the network operations analyst leaves the required Highland condition unmet and, under t13-pt2-q07, should reject it for chg-9993.
Answer B is incorrect because HSRP grouping does not define NAT pool addresses. For CHG-9993 at Highland, the network operations analyst checks Highland’s protocol state; CHG-9993 is judged from the observable result at Highland. For CHG-9993, this choice fails Highland: the network operations analyst leaves the required Highland condition unmet and, under t13-pt2-q07, should reject it for chg-9993.
Answer D is incorrect because DNS domain configuration has no role in building a NAT address pool. For CHG-9993 at Highland, the network operations analyst checks Highland’s protocol state; CHG-9993 is judged from the observable result at Highland. For CHG-9993, this choice fails Highland: the network operations analyst leaves the required Highland condition unmet and, under t13-pt2-q07, should reject it for chg-9993.
Question 8
A Kodiak server requires a permanent mapping from 10.1.1.10 to 203.0.113.10. Which NAT rule type should be configured? Choose ONE.
- A dynamic pool without a matching rule
- An `ntp server` association
- An `ip nat inside source static` mapping
- An `ip helper-address` command
Correct Answer: C
Correct Answer
Answer C is correct because The static inside-source form binds the specified inside-local address to a fixed inside-global address. For CHG-10010 at Kodiak, the NOC analyst checks Kodiak’s protocol state; CHG-10010 is judged from the observable result at Kodiak. For CHG-10010, this choice fits Kodiak: the NOC analyst gets the required Kodiak outcome and can verify CHG-10010 directly.
Incorrect Answers
Answer A is incorrect because A pool alone does not create a permanent host-specific translation. For CHG-10010 at Kodiak, the NOC analyst checks Kodiak’s protocol state; CHG-10010 is judged from the observable result at Kodiak. For CHG-10010, this choice fails Kodiak: the NOC analyst leaves the required Kodiak condition unmet and, under t13-pt2-q08, should reject it for chg-10010.
Answer D is incorrect because Helper addresses relay certain UDP broadcasts such as DHCP and do not create NAT mappings. For CHG-10010 at Kodiak, the NOC analyst checks Kodiak’s protocol state; CHG-10010 is judged from the observable result at Kodiak. For CHG-10010, this choice fails Kodiak: the NOC analyst leaves the required Kodiak condition unmet and, under t13-pt2-q08, should reject it for chg-10010.
Answer B is incorrect because NTP server configuration changes time synchronization, not address translation. For CHG-10010 at Kodiak, the NOC analyst checks Kodiak’s protocol state; CHG-10010 is judged from the observable result at Kodiak. For CHG-10010, this choice fails Kodiak: the NOC analyst leaves the required Kodiak condition unmet and, under t13-pt2-q08, should reject it for chg-10010.
Question 9
A Nimbus router has incorrect time and no NTP association. Which configuration points it at 192.0.2.20? Choose ONE.
- standby 20 ip 192.0.2.20
- ip helper-address 192.0.2.20
- ip name-server 192.0.2.20
- ntp server 192.0.2.20
Correct Answer: D
Correct Answer
Answer D is correct because The `ntp server` command configures the device to poll and synchronize with the specified NTP server. For CHG-10027 at Nimbus, the network operations analyst checks Nimbus’s protocol state; CHG-10027 is judged from the observable result at Nimbus. For CHG-10027, this choice fits Nimbus: the network operations analyst gets the required Nimbus outcome and can verify CHG-10027 directly.
Incorrect Answers
Answer C is incorrect because That configures a DNS resolver, not a time source. For CHG-10027 at Nimbus, the network operations analyst checks Nimbus’s protocol state; CHG-10027 is judged from the observable result at Nimbus. For CHG-10027, this choice fails Nimbus: the network operations analyst leaves the required Nimbus condition unmet and, under t13-pt2-q09, should reject it for chg-10027.
Answer B is incorrect because That relays selected UDP broadcasts and is commonly used for DHCP, not NTP client association. For CHG-10027 at Nimbus, the network operations analyst checks Nimbus’s protocol state; CHG-10027 is judged from the observable result at Nimbus. For CHG-10027, this choice fails Nimbus: the network operations analyst leaves the required Nimbus condition unmet and, under t13-pt2-q09, should reject it for chg-10027.
Answer A is incorrect because That defines an HSRP virtual gateway address and does not configure time synchronization. For CHG-10027 at Nimbus, the network operations analyst checks Nimbus’s protocol state; CHG-10027 is judged from the observable result at Nimbus. For CHG-10027, this choice fails Nimbus: the network operations analyst leaves the required Nimbus condition unmet and, under t13-pt2-q09, should reject it for chg-10027.
Question 10
Cedar needs one isolated router to distribute its local clock as an NTP source. Which IOS feature provides that capability? Choose ONE.
- ip dhcp pool
- ip domain lookup
- ntp server
- ntp master
Correct Answer: D
Correct Answer
Answer D is correct because `ntp master` can make a Cisco device act as an authoritative NTP source, a feature that should be used carefully when no better reference is available. For CHG-10044 at Cedar, the NOC analyst checks Cedar’s protocol state; CHG-10044 is judged from the observable result at Cedar. For CHG-10044, this choice fits Cedar: the NOC analyst gets the required Cedar outcome and can verify CHG-10044 directly.
Incorrect Answers
Answer C is incorrect because `ntp server` normally makes the local device a client of another NTP source rather than declaring its own clock authoritative. For CHG-10044 at Cedar, the NOC analyst checks Cedar’s protocol state; CHG-10044 is judged from the observable result at Cedar. For CHG-10044, this choice fails Cedar: the NOC analyst leaves the required Cedar condition unmet and, under t13-pt2-q10, should reject it for chg-10044.
Answer A is incorrect because A DHCP pool supplies address configuration and is not an NTP server role command. For CHG-10044 at Cedar, the NOC analyst checks Cedar’s protocol state; CHG-10044 is judged from the observable result at Cedar. For CHG-10044, this choice fails Cedar: the NOC analyst leaves the required Cedar condition unmet and, under t13-pt2-q10, should reject it for chg-10044.
Answer B is incorrect because DNS lookup resolves names and does not make the device an NTP time source. For CHG-10044 at Cedar, the NOC analyst checks Cedar’s protocol state; CHG-10044 is judged from the observable result at Cedar. For CHG-10044, this choice fails Cedar: the NOC analyst leaves the required Cedar condition unmet and, under t13-pt2-q10, should reject it for chg-10044.
Question 11
A Falcon ACL must permit the normal NTP client/server service. Which protocol/port pair is expected? Choose ONE.
- UDP port 123
- UDP port 53
- TCP port 22
- TCP port 80
Correct Answer: A
Correct Answer
Answer A is correct because NTP normally uses UDP port 123 for time synchronization exchanges. For CHG-10061 at Falcon, the network operations analyst checks Falcon’s protocol state; CHG-10061 is judged from the observable result at Falcon. For CHG-10061, this choice fits Falcon: the network operations analyst gets the required Falcon outcome and can verify CHG-10061 directly.
Incorrect Answers
Answer C is incorrect because TCP 22 is associated with SSH, not NTP. For CHG-10061 at Falcon, the network operations analyst checks Falcon’s protocol state; CHG-10061 is judged from the observable result at Falcon. For CHG-10061, this choice fails Falcon: the network operations analyst leaves the required Falcon condition unmet and, under t13-pt2-q11, should reject it for chg-10061.
Answer B is incorrect because UDP 53 is commonly DNS, not NTP. For CHG-10061 at Falcon, the network operations analyst checks Falcon’s protocol state; CHG-10061 is judged from the observable result at Falcon. For CHG-10061, this choice fails Falcon: the network operations analyst leaves the required Falcon condition unmet and, under t13-pt2-q11, should reject it for chg-10061.
Answer D is incorrect because TCP 80 is HTTP and is unrelated to normal NTP exchange. For CHG-10061 at Falcon, the network operations analyst checks Falcon’s protocol state; CHG-10061 is judged from the observable result at Falcon. For CHG-10061, this choice fails Falcon: the network operations analyst leaves the required Falcon condition unmet and, under t13-pt2-q11, should reject it for chg-10061.
Question 12
After configuring NTP at Indigo, which verification output helps confirm the selected association and peer state? Choose ONE.
- show ip route static
- show interfaces trunk
- show ntp associations
- show standby
Correct Answer: C
Correct Answer
Answer C is correct because This command displays NTP associations and their state, helping verify configured server or peer relationships. For CHG-10078 at Indigo, the NOC analyst checks Indigo’s protocol state; CHG-10078 is judged from the observable result at Indigo. For CHG-10078, this choice fits Indigo: the NOC analyst gets the required Indigo outcome and can verify CHG-10078 directly.
Incorrect Answers
Answer A is incorrect because That verifies static routes rather than NTP relationships. For CHG-10078 at Indigo, the NOC analyst checks Indigo’s protocol state; CHG-10078 is judged from the observable result at Indigo. For CHG-10078, this choice fails Indigo: the NOC analyst leaves the required Indigo condition unmet and, under t13-pt2-q12, should reject it for chg-10078.
Answer D is incorrect because That reports HSRP state. For CHG-10078 at Indigo, the NOC analyst checks Indigo’s protocol state; CHG-10078 is judged from the observable result at Indigo. For CHG-10078, this choice fails Indigo: the NOC analyst leaves the required Indigo condition unmet and, under t13-pt2-q12, should reject it for chg-10078.
Answer B is incorrect because That reports Layer 2 trunking state, not time synchronization. For CHG-10078 at Indigo, the NOC analyst checks Indigo’s protocol state; CHG-10078 is judged from the observable result at Indigo. For CHG-10078, this choice fails Indigo: the NOC analyst leaves the required Indigo condition unmet and, under t13-pt2-q12, should reject it for chg-10078.
Question 13
At Lumen, a branch router should act as a DHCP client on Gi0/0 rather than use a manual IPv4 address. Which setting is appropriate? Choose ONE.
- ip name-server
- ip nat inside
- ip helper-address
- ip address dhcp
Correct Answer: D
Correct Answer
Answer D is correct because The interface command requests its IPv4 address and related parameters from DHCP, making that interface a DHCP client. For CHG-10095 at Lumen, the network operations analyst checks Lumen’s protocol state; CHG-10095 is judged from the observable result at Lumen. For CHG-10095, this choice fits Lumen: the network operations analyst gets the required Lumen outcome and can verify CHG-10095 directly.
Incorrect Answers
Answer C is incorrect because Helper-address makes the router relay selected broadcasts from other clients; it does not make that interface request its own address. For CHG-10095 at Lumen, the network operations analyst checks Lumen’s protocol state; CHG-10095 is judged from the observable result at Lumen. For CHG-10095, this choice fails Lumen: the network operations analyst leaves the required Lumen condition unmet and, under t13-pt2-q13, should reject it for chg-10095.
Answer B is incorrect because NAT role classification does not acquire an IPv4 address. For CHG-10095 at Lumen, the network operations analyst checks Lumen’s protocol state; CHG-10095 is judged from the observable result at Lumen. For CHG-10095, this choice fails Lumen: the network operations analyst leaves the required Lumen condition unmet and, under t13-pt2-q13, should reject it for chg-10095.
Answer A is incorrect because That identifies DNS resolvers but does not request interface addressing. For CHG-10095 at Lumen, the network operations analyst checks Lumen’s protocol state; CHG-10095 is judged from the observable result at Lumen. For CHG-10095, this choice fails Lumen: the network operations analyst leaves the required Lumen condition unmet and, under t13-pt2-q13, should reject it for chg-10095.
Question 14
A Orchid router sees DHCP Discover broadcasts on VLAN 20 but the server is on another routed subnet. What configuration should be placed on the client-facing SVI? Choose ONE.
- ntp server 192.0.2.50
- standby 20 ip 192.0.2.50
- ip name-server 192.0.2.50
- ip helper-address 192.0.2.50
Correct Answer: D
Correct Answer
Answer D is correct because The helper address makes the router act as a relay, converting supported local UDP broadcasts such as DHCP into routed traffic toward the specified server. For CHG-10112 at Orchid, the NOC analyst checks Orchid’s protocol state; CHG-10112 is judged from the observable result at Orchid. For CHG-10112, this choice fits Orchid: the NOC analyst gets the required Orchid outcome and can verify CHG-10112 directly.
Incorrect Answers
Answer C is incorrect because That configures DNS resolution for the router itself and does not relay client DHCP broadcasts. For CHG-10112 at Orchid, the NOC analyst checks Orchid’s protocol state; CHG-10112 is judged from the observable result at Orchid. For CHG-10112, this choice fails Orchid: the NOC analyst leaves the required Orchid condition unmet and, under t13-pt2-q14, should reject it for chg-10112.
Answer A is incorrect because That configures a time source, not DHCP relay. For CHG-10112 at Orchid, the NOC analyst checks Orchid’s protocol state; CHG-10112 is judged from the observable result at Orchid. For CHG-10112, this choice fails Orchid: the NOC analyst leaves the required Orchid condition unmet and, under t13-pt2-q14, should reject it for chg-10112.
Answer B is incorrect because That creates an HSRP virtual IP and does not forward DHCP requests to the server. For CHG-10112 at Orchid, the NOC analyst checks Orchid’s protocol state; CHG-10112 is judged from the observable result at Orchid. For CHG-10112, this choice fails Orchid: the NOC analyst leaves the required Orchid condition unmet and, under t13-pt2-q14, should reject it for chg-10112.
Question 15
A remote DHCP server at Redwood receives a relayed request and chooses the correct scope based on the relay gateway address. Which DHCP field carries it? Choose ONE.
- giaddr (gateway IP address)
- NTP stratum
- DNS MX record
- OSPF router ID
Correct Answer: A
Correct Answer
Answer A is correct because A DHCP relay inserts its client-facing interface address into the giaddr field so the server can identify the originating subnet and choose an appropriate pool. For CHG-10129 at Redwood, the network operations analyst checks Redwood’s protocol state; CHG-10129 is judged from the observable result at Redwood. For CHG-10129, this choice fits Redwood: the network operations analyst gets the required Redwood outcome and can verify CHG-10129 directly.
Incorrect Answers
Answer C is incorrect because Mail-exchanger DNS records are unrelated to DHCP scope selection. For CHG-10129 at Redwood, the network operations analyst checks Redwood’s protocol state; CHG-10129 is judged from the observable result at Redwood. For CHG-10129, this choice fails Redwood: the network operations analyst leaves the required Redwood condition unmet and, under t13-pt2-q15, should reject it for chg-10129.
Answer B is incorrect because NTP stratum measures time-source hierarchy and is not carried for DHCP address allocation. For CHG-10129 at Redwood, the network operations analyst checks Redwood’s protocol state; CHG-10129 is judged from the observable result at Redwood. For CHG-10129, this choice fails Redwood: the network operations analyst leaves the required Redwood condition unmet and, under t13-pt2-q15, should reject it for chg-10129.
Answer D is incorrect because OSPF identity is not the DHCP relay gateway field. For CHG-10129 at Redwood, the network operations analyst checks Redwood’s protocol state; CHG-10129 is judged from the observable result at Redwood. For CHG-10129, this choice fails Redwood: the network operations analyst leaves the required Redwood condition unmet and, under t13-pt2-q15, should reject it for chg-10129.
Question 16
A Union LAN should relay DHCP requests to servers 192.0.2.50 and 192.0.2.60. Which design is valid? Choose ONE.
- No; only one helper address is allowed per interface
- Only DNS round-robin can select DHCP servers
- Yes; configure one helper address for each server
- Only HSRP can provide DHCP redundancy
Correct Answer: C
Correct Answer
Answer C is correct because IOS supports multiple helper addresses on an interface, allowing relayed requests to be forwarded toward multiple configured servers. For CHG-10146 at Union, the NOC analyst checks Union’s protocol state; CHG-10146 is judged from the observable result at Union. For CHG-10146, this choice fits Union: the NOC analyst gets the required Union outcome and can verify CHG-10146 directly.
Incorrect Answers
Answer A is incorrect because Multiple helper addresses are supported and commonly used for redundant DHCP servers. For CHG-10146 at Union, the NOC analyst checks Union’s protocol state; CHG-10146 is judged from the observable result at Union. For CHG-10146, this choice fails Union: the NOC analyst leaves the required Union condition unmet and, under t13-pt2-q16, should reject it for chg-10146.
Answer D is incorrect because HSRP provides first-hop gateway redundancy but does not replace the ability to relay to multiple DHCP servers. For CHG-10146 at Union, the NOC analyst checks Union’s protocol state; CHG-10146 is judged from the observable result at Union. For CHG-10146, this choice fails Union: the NOC analyst leaves the required Union condition unmet and, under t13-pt2-q16, should reject it for chg-10146.
Answer B is incorrect because DNS is not required for multiple numeric helper-address destinations. For CHG-10146 at Union, the NOC analyst checks Union’s protocol state; CHG-10146 is judged from the observable result at Union. For CHG-10146, this choice fails Union: the NOC analyst leaves the required Union condition unmet and, under t13-pt2-q16, should reject it for chg-10146.
Question 17
A new Xenon laptop boots without manual IPv4 configuration and automatically receives address, mask, gateway, and DNS information. Which service supplied it? Choose ONE.
- Packet address translation
- Network time synchronization
- Name-to-address resolution
- Dynamic delivery of IP configuration parameters
Correct Answer: D
Correct Answer
Answer D is correct because DHCP automates host network configuration, commonly providing an IPv4 address, subnet mask, default gateway, DNS servers, and lease information. For CHG-10163 at Xenon, the network operations analyst checks Xenon’s protocol state; CHG-10163 is judged from the observable result at Xenon. For CHG-10163, this choice fits Xenon: the network operations analyst gets the required Xenon outcome and can verify CHG-10163 directly.
Incorrect Answers
Answer C is incorrect because That is the principal role of DNS rather than DHCP. For CHG-10163 at Xenon, the network operations analyst checks Xenon’s protocol state; CHG-10163 is judged from the observable result at Xenon. For CHG-10163, this choice fails Xenon: the network operations analyst leaves the required Xenon condition unmet and, under t13-pt2-q17, should reject it for chg-10163.
Answer B is incorrect because That is NTP. For CHG-10163 at Xenon, the network operations analyst checks Xenon’s protocol state; CHG-10163 is judged from the observable result at Xenon. For CHG-10163, this choice fails Xenon: the network operations analyst leaves the required Xenon condition unmet and, under t13-pt2-q17, should reject it for chg-10163.
Answer A is incorrect because That is NAT, which rewrites addresses rather than assigning host configuration leases. For CHG-10163 at Xenon, the network operations analyst checks Xenon’s protocol state; CHG-10163 is judged from the observable result at Xenon. For CHG-10163, this choice fails Xenon: the network operations analyst leaves the required Xenon condition unmet and, under t13-pt2-q17, should reject it for chg-10163.
Question 18
A Aspen user can ping 203.0.113.80 but cannot reach `app.example.com` by name. Which service is most directly implicated? Choose ONE.
- Synchronizing device clocks
- Translating private source addresses at an edge
- Assigning IPv4 leases
- Mapping domain/host names to IP addresses
Correct Answer: D
Correct Answer
Answer D is correct because DNS provides distributed name resolution so clients can translate human-readable names into address information and other resource records. For CHG-10180 at Aspen, the NOC analyst checks Aspen’s protocol state; CHG-10180 is judged from the observable result at Aspen. For CHG-10180, this choice fits Aspen: the NOC analyst gets the required Aspen outcome and can verify CHG-10180 directly.
Incorrect Answers
Answer C is incorrect because DHCP supplies address configuration; it does not primarily resolve application host names. For CHG-10180 at Aspen, the NOC analyst checks Aspen’s protocol state; CHG-10180 is judged from the observable result at Aspen. For CHG-10180, this choice fails Aspen: the NOC analyst leaves the required Aspen condition unmet and, under t13-pt2-q18, should reject it for chg-10180.
Answer A is incorrect because NTP provides time synchronization. For CHG-10180 at Aspen, the NOC analyst checks Aspen’s protocol state; CHG-10180 is judged from the observable result at Aspen. For CHG-10180, this choice fails Aspen: the NOC analyst leaves the required Aspen condition unmet and, under t13-pt2-q18, should reject it for chg-10180.
Answer B is incorrect because NAT changes packet addresses and ports; it does not perform name resolution. For CHG-10180 at Aspen, the NOC analyst checks Aspen’s protocol state; CHG-10180 is judged from the observable result at Aspen. For CHG-10180, this choice fails Aspen: the NOC analyst leaves the required Aspen condition unmet and, under t13-pt2-q18, should reject it for chg-10180.
Question 19
A Drift router cannot resolve names because no DNS server is configured. Which global command points it to 192.0.2.53? Choose ONE.
- ip name-server 192.0.2.53
- ntp server 192.0.2.53
- ip helper-address 192.0.2.53
- ip nat pool DNS 192.0.2.53 192.0.2.53
Correct Answer: A
Correct Answer
Answer A is correct because The command identifies a DNS name server that the IOS resolver can query for host-name-to-address information. For CHG-10197 at Drift, the network operations analyst checks Drift’s protocol state; CHG-10197 is judged from the observable result at Drift. For CHG-10197, this choice fits Drift: the network operations analyst gets the required Drift outcome and can verify CHG-10197 directly.
Incorrect Answers
Answer C is incorrect because That relays selected client UDP broadcasts and is not the router resolver-server setting. For CHG-10197 at Drift, the network operations analyst checks Drift’s protocol state; CHG-10197 is judged from the observable result at Drift. For CHG-10197, this choice fails Drift: the network operations analyst leaves the required Drift condition unmet and, under t13-pt2-q19, should reject it for chg-10197.
Answer B is incorrect because That configures a time source. For CHG-10197 at Drift, the network operations analyst checks Drift’s protocol state; CHG-10197 is judged from the observable result at Drift. For CHG-10197, this choice fails Drift: the network operations analyst leaves the required Drift condition unmet and, under t13-pt2-q19, should reject it for chg-10197.
Answer D is incorrect because A NAT pool defines translation addresses and does not identify a DNS resolver. For CHG-10197 at Drift, the network operations analyst checks Drift’s protocol state; CHG-10197 is judged from the observable result at Drift. For CHG-10197, this choice fails Drift: the network operations analyst leaves the required Drift condition unmet and, under t13-pt2-q19, should reject it for chg-10197.
Question 20
A Grove router has a valid `ip name-server` but still does not attempt DNS because domain lookup was disabled. Which setting should be restored? Choose ONE.
- ip dhcp relay information option
- standby preempt
- ip domain lookup
- ip nat inside
Correct Answer: C
Correct Answer
Answer C is correct because This command enables IOS DNS-based host-name lookup when that function has previously been disabled. For CHG-10214 at Grove, the NOC analyst checks Grove’s protocol state; CHG-10214 is judged from the observable result at Grove. For CHG-10214, this choice fits Grove: the NOC analyst gets the required Grove outcome and can verify CHG-10214 directly.
Incorrect Answers
Answer A is incorrect because That affects DHCP relay metadata rather than DNS resolution. For CHG-10214 at Grove, the NOC analyst checks Grove’s protocol state; CHG-10214 is judged from the observable result at Grove. For CHG-10214, this choice fails Grove: the NOC analyst leaves the required Grove condition unmet and, under t13-pt2-q20, should reject it for chg-10214.
Answer D is incorrect because That marks a NAT interface role and does not enable name lookup. For CHG-10214 at Grove, the NOC analyst checks Grove’s protocol state; CHG-10214 is judged from the observable result at Grove. For CHG-10214, this choice fails Grove: the NOC analyst leaves the required Grove condition unmet and, under t13-pt2-q20, should reject it for chg-10214.
Answer B is incorrect because That changes HSRP active-role behavior and is unrelated to DNS. For CHG-10214 at Grove, the NOC analyst checks Grove’s protocol state; CHG-10214 is judged from the observable result at Grove. For CHG-10214, this choice fails Grove: the NOC analyst leaves the required Grove condition unmet and, under t13-pt2-q20, should reject it for chg-10214.
