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Exam Code: N10-009
Exam Name: CompTIA Network+
Certification Provider: CompTIA
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CompTIA Network+ N10-009 Practice Test 28

Question 270

An OSPF adjacency never reaches full state after one side changes area identity. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify OSPF process starts without comparing neighbor Hello area IDs
  2. Check Hello neighbor state and area match
  3. Ping adjacent router IP but never inspect the OSPF neighbor state
  4. Check the routing table for unrelated prefixes instead of the changed site's LSDB formation

Explanation

Correct Answer

B:

OSPF area mismatch blocks adjacency independent of available IP connectivity. The result of the remedy is checked directly: Check Hello neighbor state and area match.

Incorrect Answers

A:

Verify OSPF process starts without comparing neighbor Hello area IDs. OSPF area mismatch blocks adjacency independent of available IP connectivity. The appropriate acceptance test is: Check Hello neighbor state and area match.

C:

Ping adjacent router IP but never inspect the OSPF neighbor state. OSPF area mismatch blocks adjacency independent of available IP connectivity. The appropriate acceptance test is: Check Hello neighbor state and area match.

D:

Check the routing table for unrelated prefixes instead of the changed site's LSDB formation. OSPF area mismatch blocks adjacency independent of available IP connectivity. The appropriate acceptance test is: Check Hello neighbor state and area match.

Question 271

A transit OSPF link has MTU mismatch while neighbors see each other. Which response MOST directly addresses the stated network problem or requirement?

  1. Force OSPF database exchange with unequal interface MTUs and ignore stuck Exchange state
  2. Increase Hello interval alone although the mismatch occurs during DBD exchange
  3. Reconcile interface MTU and resulting OSPF database exchange
  4. Change DNS suffix configuration rather than reconcile the OSPF link MTU

Explanation

Correct Answer

C:

OSPF database synchronization can fail after neighbor discovery. A direct way to confirm the outcome is to inspect ExStart/Exchange states and DBD retransmissions.

Incorrect Answers

A:

Force OSPF database exchange with unequal interface MTUs and ignore stuck Exchange state. OSPF database synchronization can fail after neighbor discovery. This does not implement the needed approach: reconcile interface MTU and resulting OSPF database exchange.

B:

Increase Hello interval alone although the mismatch occurs during DBD exchange. OSPF database synchronization can fail after neighbor discovery. This does not implement the needed approach: reconcile interface MTU and resulting OSPF database exchange.

D:

Change DNS suffix configuration rather than reconcile the OSPF link MTU. OSPF database synchronization can fail after neighbor discovery. This does not implement the needed approach: reconcile interface MTU and resulting OSPF database exchange.

Question 272

A transit OSPF link has MTU mismatch while neighbors see each other. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe OSPF Hello packets but never inspect DBD retransmits and Exchange/ExStart states
  2. Read the interface bandwidth label instead of its actual MTU and database exchange
  3. Check a different healthy OSPF neighbor and infer the mismatched transit adjacency is Full
  4. Inspect ExStart/Exchange states and DBD retransmissions

Explanation

Correct Answer

D:

OSPF database synchronization can fail after neighbor discovery. The result of the remedy is checked directly: Inspect ExStart/Exchange states and DBD retransmissions.

Incorrect Answers

A:

Observe OSPF Hello packets but never inspect DBD retransmits and Exchange/ExStart states. OSPF database synchronization can fail after neighbor discovery. The appropriate acceptance test is: Inspect ExStart/Exchange states and DBD retransmissions.

B:

Read the interface bandwidth label instead of its actual MTU and database exchange. OSPF database synchronization can fail after neighbor discovery. The appropriate acceptance test is: Inspect ExStart/Exchange states and DBD retransmissions.

C:

Check a different healthy OSPF neighbor and infer the mismatched transit adjacency is Full. OSPF database synchronization can fail after neighbor discovery. The appropriate acceptance test is: Inspect ExStart/Exchange states and DBD retransmissions.

Question 273

A static route points to a next hop unreachable after WAN failure. Which response MOST directly addresses the stated network problem or requirement?

  1. Use tracking/floating backup routing where supported
  2. Keep a static route pointing at the failed primary next hop without a backup or tracking
  3. Configure an unreachable floating static route with a lower preference than the broken primary
  4. Change remote DNS entries while the installed route blackholes packets after link loss

Explanation

Correct Answer

A:

Lower-preference floating static route requires failure detection to activate. A direct way to confirm the outcome is to remove primary next hop and inspect automatic backup route installation.

Incorrect Answers

B:

Keep a static route pointing at the failed primary next hop without a backup or tracking. Lower-preference floating static route requires failure detection to activate. This does not implement the needed approach: use tracking/floating backup routing where supported.

C:

Configure an unreachable floating static route with a lower preference than the broken primary. Lower-preference floating static route requires failure detection to activate. This does not implement the needed approach: use tracking/floating backup routing where supported.

D:

Change remote DNS entries while the installed route blackholes packets after link loss. Lower-preference floating static route requires failure detection to activate. This does not implement the needed approach: use tracking/floating backup routing where supported.

Question 274

A static route points to a next hop unreachable after WAN failure. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm the backup statement is configured but never shut down the primary next hop
  2. Remove primary next hop and inspect automatic backup route installation
  3. Ping the source router itself rather than tracing traffic after WAN failure
  4. Inspect a stable routing table before failure and infer the floating backup becomes active

Explanation

Correct Answer

B:

Lower-preference floating static route requires failure detection to activate. The result of the remedy is checked directly: Remove primary next hop and inspect automatic backup route installation.

Incorrect Answers

A:

Confirm the backup statement is configured but never shut down the primary next hop. Lower-preference floating static route requires failure detection to activate. The appropriate acceptance test is: Remove primary next hop and inspect automatic backup route installation.

C:

Ping the source router itself rather than tracing traffic after WAN failure. Lower-preference floating static route requires failure detection to activate. The appropriate acceptance test is: Remove primary next hop and inspect automatic backup route installation.

D:

Inspect a stable routing table before failure and infer the floating backup becomes active. Lower-preference floating static route requires failure detection to activate. The appropriate acceptance test is: Remove primary next hop and inspect automatic backup route installation.

Question 275

A remote site dynamically chooses a longer path despite available shorter one. Which response MOST directly addresses the stated network problem or requirement?

  1. Select the longest physical cable as the lowest-cost dynamic route without measuring protocol metrics
  2. Prefer the higher metric path merely because it is currently installed
  3. Check protocol metric weights and current topology rather than IP class
  4. Use legacy classful address labels to choose a routing protocol's best path

Explanation

Correct Answer

C:

Route metric encodes protocol path cost, not physical distance alone. A direct way to confirm the outcome is to compare route candidates, metric values and path changes.

Incorrect Answers

A:

Select the longest physical cable as the lowest-cost dynamic route without measuring protocol metrics. Route metric encodes protocol path cost, not physical distance alone. This does not implement the needed approach: check protocol metric weights and current topology rather than IP class.

B:

Prefer the higher metric path merely because it is currently installed. Route metric encodes protocol path cost, not physical distance alone. This does not implement the needed approach: check protocol metric weights and current topology rather than IP class.

D:

Use legacy classful address labels to choose a routing protocol's best path. Route metric encodes protocol path cost, not physical distance alone. This does not implement the needed approach: check protocol metric weights and current topology rather than IP class.

Question 276

A remote site dynamically chooses a longer path despite available shorter one. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read the configured network masks but not candidate route metrics and next hops
  2. Ping one destination from the source host without comparing both alternate dynamic routes
  3. Inspect interface descriptions alone while ignoring route changes when the topology is modified
  4. Compare route candidates, metric values and path changes

Explanation

Correct Answer

D:

Route metric encodes protocol path cost, not physical distance alone. The result of the remedy is checked directly: Compare route candidates, metric values and path changes.

Incorrect Answers

A:

Read the configured network masks but not candidate route metrics and next hops. Route metric encodes protocol path cost, not physical distance alone. The appropriate acceptance test is: Compare route candidates, metric values and path changes.

B:

Ping one destination from the source host without comparing both alternate dynamic routes. Route metric encodes protocol path cost, not physical distance alone. The appropriate acceptance test is: Compare route candidates, metric values and path changes.

C:

Inspect interface descriptions alone while ignoring route changes when the topology is modified. Route metric encodes protocol path cost, not physical distance alone. The appropriate acceptance test is: Compare route candidates, metric values and path changes.

Question 277

An IPv4 exit NAT table exhausts port mappings during many simultaneous connections. Which response MOST directly addresses the stated network problem or requirement?

  1. Scale translation capacity or distribute source addresses without compromising policy
  2. Keep allocating the same exhausted source ports to new translations and suppress allocation errors
  3. Reduce public address capacity while concurrent NAT sessions continue increasing
  4. Change DNS record TTLs instead of addressing finite PAT translation port capacity

Explanation

Correct Answer

A:

PAT state and port space are finite shared resources. A direct way to confirm the outcome is to inspect active translation utilization and failed allocation counters.

Incorrect Answers

B:

Keep allocating the same exhausted source ports to new translations and suppress allocation errors. PAT state and port space are finite shared resources. This does not implement the needed approach: scale translation capacity or distribute source addresses without compromising policy.

C:

Reduce public address capacity while concurrent NAT sessions continue increasing. PAT state and port space are finite shared resources. This does not implement the needed approach: scale translation capacity or distribute source addresses without compromising policy.

D:

Change DNS record TTLs instead of addressing finite PAT translation port capacity. PAT state and port space are finite shared resources. This does not implement the needed approach: scale translation capacity or distribute source addresses without compromising policy.

Question 278

An IPv4 exit NAT table exhausts port mappings during many simultaneous connections. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Show Internet egress works for one existing session while new PAT allocations still fail
  2. Inspect active translation utilization and failed allocation counters
  3. Read only total packets through NAT without examining port utilization and allocation errors
  4. Test the exit router's management ping rather than concurrent session translation capacity

Explanation

Correct Answer

B:

PAT state and port space are finite shared resources. The result of the remedy is checked directly: Inspect active translation utilization and failed allocation counters.

Incorrect Answers

A:

Show Internet egress works for one existing session while new PAT allocations still fail. PAT state and port space are finite shared resources. The appropriate acceptance test is: Inspect active translation utilization and failed allocation counters.

C:

Read only total packets through NAT without examining port utilization and allocation errors. PAT state and port space are finite shared resources. The appropriate acceptance test is: Inspect active translation utilization and failed allocation counters.

D:

Test the exit router's management ping rather than concurrent session translation capacity. PAT state and port space are finite shared resources. The appropriate acceptance test is: Inspect active translation utilization and failed allocation counters.

Question 279

A public-facing host is incorrectly translated through the same inbound and outbound rule set. Which response MOST directly addresses the stated network problem or requirement?

  1. Apply inbound destination NAT as an outbound source-NAT rule without distinguishing packet direction
  2. Translate a public-facing service twice through the same unqualified NAT rule
  3. Separate source and destination NAT intent and packet path order
  4. Permit all inbound traffic to compensate for a wrong translation order

Explanation

Correct Answer

C:

NAT policy direction changes which packet tuple is matched. A direct way to confirm the outcome is to packet-capture each stage and compare pre/post translation tuple.

Incorrect Answers

A:

Apply inbound destination NAT as an outbound source-NAT rule without distinguishing packet direction. NAT policy direction changes which packet tuple is matched. This does not implement the needed approach: separate source and destination NAT intent and packet path order.

B:

Translate a public-facing service twice through the same unqualified NAT rule. NAT policy direction changes which packet tuple is matched. This does not implement the needed approach: separate source and destination NAT intent and packet path order.

D:

Permit all inbound traffic to compensate for a wrong translation order. NAT policy direction changes which packet tuple is matched. This does not implement the needed approach: separate source and destination NAT intent and packet path order.

Question 280

A public-facing host is incorrectly translated through the same inbound and outbound rule set. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe one post-NAT packet without comparing pre-translation source and destination tuples
  2. Verify outbound Internet access but never test expected public-to-private service mapping
  3. Read NAT rule names without packet traces through each source/destination translation stage
  4. Packet-capture each stage and compare pre/post translation tuple

Explanation

Correct Answer

D:

NAT policy direction changes which packet tuple is matched. The result of the remedy is checked directly: Packet-capture each stage and compare pre/post translation tuple.

Incorrect Answers

A:

Observe one post-NAT packet without comparing pre-translation source and destination tuples. NAT policy direction changes which packet tuple is matched. The appropriate acceptance test is: Packet-capture each stage and compare pre/post translation tuple.

B:

Verify outbound Internet access but never test expected public-to-private service mapping. NAT policy direction changes which packet tuple is matched. The appropriate acceptance test is: Packet-capture each stage and compare pre/post translation tuple.

C:

Read NAT rule names without packet traces through each source/destination translation stage. NAT policy direction changes which packet tuple is matched. The appropriate acceptance test is: Packet-capture each stage and compare pre/post translation tuple.

CompTIA Network+ (N10-009) Practice Tests

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