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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 87

Question 860

An application's old DNS answer persists after backend cutover. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Confirm authoritative DNS contains the new address but never inspect the client's cached result
  2. Check a service process is Running without verifying which IP address the client actually uses
  3. Query a different hostname and claim the old cutover answer was evicted
  4. Compare TTL from authoritative versus client cache

Explanation

Correct Answer

D:

DNS cache retention can outlive successful server changes. The result of the remedy is checked directly: Compare TTL from authoritative versus client cache.

Incorrect Answers

A:

Confirm authoritative DNS contains the new address but never inspect the client's cached result. DNS cache retention can outlive successful server changes. The appropriate acceptance test is: Compare TTL from authoritative versus client cache.

B:

Check a service process is Running without verifying which IP address the client actually uses. DNS cache retention can outlive successful server changes. The appropriate acceptance test is: Compare TTL from authoritative versus client cache.

C:

Query a different hostname and claim the old cutover answer was evicted. DNS cache retention can outlive successful server changes. The appropriate acceptance test is: Compare TTL from authoritative versus client cache.

Question 861

A branch router chooses default ISP route despite more-specific private VPN route expected. Which response MOST directly addresses the stated network problem or requirement?

  1. Repair missing more-specific route or policy import
  2. Choose the ISP default route even when a more-specific private VPN prefix is expected
  3. Delete the VPN route policy and assume the default Internet path reaches private addresses
  4. Change DHCP pool size to fix route selection on the branch router

Explanation

Correct Answer

A:

Longest-prefix selection can supersede broad default path. A direct way to confirm the outcome is to inspect route table longest match and VPN prefix advertisements.

Incorrect Answers

B:

Choose the ISP default route even when a more-specific private VPN prefix is expected. Longest-prefix selection can supersede broad default path. This does not implement the needed approach: repair missing more-specific route or policy import.

C:

Delete the VPN route policy and assume the default Internet path reaches private addresses. Longest-prefix selection can supersede broad default path. This does not implement the needed approach: repair missing more-specific route or policy import.

D:

Change DHCP pool size to fix route selection on the branch router. Longest-prefix selection can supersede broad default path. This does not implement the needed approach: repair missing more-specific route or policy import.

Question 862

A branch router chooses default ISP route despite more-specific private VPN route expected. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Ping the public ISP gateway and infer the private VPN destination uses the correct route
  2. Inspect route table longest match and VPN prefix advertisements
  3. Read VPN tunnel status Up without inspecting prefix advertisements or route-table longest match
  4. Trace a general public destination instead of the failing private subnet

Explanation

Correct Answer

B:

Longest-prefix selection can supersede broad default path. The result of the remedy is checked directly: Inspect route table longest match and VPN prefix advertisements.

Incorrect Answers

A:

Ping the public ISP gateway and infer the private VPN destination uses the correct route. Longest-prefix selection can supersede broad default path. The appropriate acceptance test is: Inspect route table longest match and VPN prefix advertisements.

C:

Read VPN tunnel status Up without inspecting prefix advertisements or route-table longest match. Longest-prefix selection can supersede broad default path. The appropriate acceptance test is: Inspect route table longest match and VPN prefix advertisements.

D:

Trace a general public destination instead of the failing private subnet. Longest-prefix selection can supersede broad default path. The appropriate acceptance test is: Inspect route table longest match and VPN prefix advertisements.

Question 863

An OSPF route disappears when one site changes area membership. Which response MOST directly addresses the stated network problem or requirement?

  1. Change the OSPF IP MTU only without reconciling the mismatched area IDs
  2. Advertise a default route and leave the broken OSPF neighbor relationship unchanged
  3. Correct OSPF area consistency and adjacency state
  4. Replace the VLAN access cable even though the OSPF interface and Hello traffic operate

Explanation

Correct Answer

C:

Area mismatch blocks control-plane learning while interface remains up. A direct way to confirm the outcome is to check Hello area IDs and neighbor database state.

Incorrect Answers

A:

Change the OSPF IP MTU only without reconciling the mismatched area IDs. Area mismatch blocks control-plane learning while interface remains up. This does not implement the needed approach: correct OSPF area consistency and adjacency state.

B:

Advertise a default route and leave the broken OSPF neighbor relationship unchanged. Area mismatch blocks control-plane learning while interface remains up. This does not implement the needed approach: correct OSPF area consistency and adjacency state.

D:

Replace the VLAN access cable even though the OSPF interface and Hello traffic operate. Area mismatch blocks control-plane learning while interface remains up. This does not implement the needed approach: correct OSPF area consistency and adjacency state.

Question 864

An OSPF route disappears when one site changes area membership. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read only the OSPF process status without comparing neighbor area IDs
  2. Confirm the Ethernet interface remains Up and assume adjacency reached Full
  3. Check one unrelated OSPF area while the changed site's Hello and LSDB state are unexamined
  4. Check Hello area IDs and neighbor database state

Explanation

Correct Answer

D:

Area mismatch blocks control-plane learning while interface remains up. The result of the remedy is checked directly: Check Hello area IDs and neighbor database state.

Incorrect Answers

A:

Read only the OSPF process status without comparing neighbor area IDs. Area mismatch blocks control-plane learning while interface remains up. The appropriate acceptance test is: Check Hello area IDs and neighbor database state.

B:

Confirm the Ethernet interface remains Up and assume adjacency reached Full. Area mismatch blocks control-plane learning while interface remains up. The appropriate acceptance test is: Check Hello area IDs and neighbor database state.

C:

Check one unrelated OSPF area while the changed site's Hello and LSDB state are unexamined. Area mismatch blocks control-plane learning while interface remains up. The appropriate acceptance test is: Check Hello area IDs and neighbor database state.

Question 865

A BGP prefix disappears after a policy edit while session stays established. Which response MOST directly addresses the stated network problem or requirement?

  1. Fix import/export route filters and prefix limits
  2. Restart the BGP TCP session repeatedly while an export filter still rejects the prefix
  3. Reduce all BGP timers without correcting the edited route-policy matches
  4. Change host DNS search suffixes instead of restoring intended BGP prefix acceptance

Explanation

Correct Answer

A:

Established BGP neighbor does not guarantee permission for every route. A direct way to confirm the outcome is to inspect advertised-routes and accepted-routes policy traces.

Incorrect Answers

B:

Restart the BGP TCP session repeatedly while an export filter still rejects the prefix. Established BGP neighbor does not guarantee permission for every route. This does not implement the needed approach: fix import/export route filters and prefix limits.

C:

Reduce all BGP timers without correcting the edited route-policy matches. Established BGP neighbor does not guarantee permission for every route. This does not implement the needed approach: fix import/export route filters and prefix limits.

D:

Change host DNS search suffixes instead of restoring intended BGP prefix acceptance. Established BGP neighbor does not guarantee permission for every route. This does not implement the needed approach: fix import/export route filters and prefix limits.

Question 866

A BGP prefix disappears after a policy edit while session stays established. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. See BGP neighbor Established and infer every required route is exported
  2. Inspect advertised-routes and accepted-routes policy traces
  3. Inspect the local routing table only without comparing advertised and accepted prefix traces
  4. Ping the peer router's address rather than inspect the missing destination prefix's policy decision

Explanation

Correct Answer

B:

Established BGP neighbor does not guarantee permission for every route. The result of the remedy is checked directly: Inspect advertised-routes and accepted-routes policy traces.

Incorrect Answers

A:

See BGP neighbor Established and infer every required route is exported. Established BGP neighbor does not guarantee permission for every route. The appropriate acceptance test is: Inspect advertised-routes and accepted-routes policy traces.

C:

Inspect the local routing table only without comparing advertised and accepted prefix traces. Established BGP neighbor does not guarantee permission for every route. The appropriate acceptance test is: Inspect advertised-routes and accepted-routes policy traces.

D:

Ping the peer router's address rather than inspect the missing destination prefix's policy decision. Established BGP neighbor does not guarantee permission for every route. The appropriate acceptance test is: Inspect advertised-routes and accepted-routes policy traces.

Question 867

Two OSPF neighbors remain stuck in Exchange after MTU change. Which response MOST directly addresses the stated network problem or requirement?

  1. Increase OSPF Hello interval to repair a database-description MTU mismatch
  2. Disable neighbor database exchange to keep the router in a non-Full state permanently
  3. Reconcile DBD exchange and interface MTU
  4. Change public DNS TTLs instead of reconciling OSPF DBD payload and interface MTU

Explanation

Correct Answer

C:

Route exchange can stall after successful OSPF Hello. A direct way to confirm the outcome is to inspect neighbor state and DBD sequence retransmits.

Incorrect Answers

A:

Increase OSPF Hello interval to repair a database-description MTU mismatch. Route exchange can stall after successful OSPF Hello. This does not implement the needed approach: reconcile DBD exchange and interface MTU.

B:

Disable neighbor database exchange to keep the router in a non-Full state permanently. Route exchange can stall after successful OSPF Hello. This does not implement the needed approach: reconcile DBD exchange and interface MTU.

D:

Change public DNS TTLs instead of reconciling OSPF DBD payload and interface MTU. Route exchange can stall after successful OSPF Hello. This does not implement the needed approach: reconcile DBD exchange and interface MTU.

Question 868

Two OSPF neighbors remain stuck in Exchange after MTU change. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify two-way OSPF Hellos but never inspect Exchange-state DBD retransmissions
  2. Compare router CPU utilization rather than OSPF neighbor state and DBD sequence
  3. Read configured area ID alone without evaluating MTU and database exchange behavior
  4. Inspect neighbor state and DBD sequence retransmits

Explanation

Correct Answer

D:

Route exchange can stall after successful OSPF Hello. The result of the remedy is checked directly: Inspect neighbor state and DBD sequence retransmits.

Incorrect Answers

A:

Verify two-way OSPF Hellos but never inspect Exchange-state DBD retransmissions. Route exchange can stall after successful OSPF Hello. The appropriate acceptance test is: Inspect neighbor state and DBD sequence retransmits.

B:

Compare router CPU utilization rather than OSPF neighbor state and DBD sequence. Route exchange can stall after successful OSPF Hello. The appropriate acceptance test is: Inspect neighbor state and DBD sequence retransmits.

C:

Read configured area ID alone without evaluating MTU and database exchange behavior. Route exchange can stall after successful OSPF Hello. The appropriate acceptance test is: Inspect neighbor state and DBD sequence retransmits.

Question 869

A return packet traverses a different stateful firewall from the request. Which response MOST directly addresses the stated network problem or requirement?

  1. Repair asymmetric routing or deploy supported state-sharing
  2. Permit one-way outbound traffic through a stateful firewall and ignore the asymmetric return route
  3. Turn off session tracking on both edge firewalls without a policy decision
  4. Change DNS delegation while replies still traverse an untracked second firewall

Explanation

Correct Answer

A:

Stateful middleboxes can drop legitimate asymmetric responses. A direct way to confirm the outcome is to capture both forward and return paths around stateful gateways.

Incorrect Answers

B:

Permit one-way outbound traffic through a stateful firewall and ignore the asymmetric return route. Stateful middleboxes can drop legitimate asymmetric responses. This does not implement the needed approach: repair asymmetric routing or deploy supported state-sharing.

C:

Turn off session tracking on both edge firewalls without a policy decision. Stateful middleboxes can drop legitimate asymmetric responses. This does not implement the needed approach: repair asymmetric routing or deploy supported state-sharing.

D:

Change DNS delegation while replies still traverse an untracked second firewall. Stateful middleboxes can drop legitimate asymmetric responses. This does not implement the needed approach: repair asymmetric routing or deploy supported state-sharing.

Question 870

A return packet traverses a different stateful firewall from the request. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Show the forward SYN reached the destination but never inspect the return path
  2. Capture both forward and return paths around stateful gateways
  3. Ping both firewall management ports and infer stateful reverse traffic is accepted
  4. Verify routing only on the primary appliance while response packets return through the other gateway

Explanation

Correct Answer

B:

Stateful middleboxes can drop legitimate asymmetric responses. The result of the remedy is checked directly: Capture both forward and return paths around stateful gateways.

Incorrect Answers

A:

Show the forward SYN reached the destination but never inspect the return path. Stateful middleboxes can drop legitimate asymmetric responses. The appropriate acceptance test is: Capture both forward and return paths around stateful gateways.

C:

Ping both firewall management ports and infer stateful reverse traffic is accepted. Stateful middleboxes can drop legitimate asymmetric responses. The appropriate acceptance test is: Capture both forward and return paths around stateful gateways.

D:

Verify routing only on the primary appliance while response packets return through the other gateway. Stateful middleboxes can drop legitimate asymmetric responses. The appropriate acceptance test is: Capture both forward and return paths around stateful gateways.

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