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CompTIA N10-009 Practice Test 79

Question 780

A network team observes: A Linux server reaches its local segment but chooses the wrong default gateway after adding a second NIC. What is the MOST appropriate corrective action or technical decision?

  1. Query affected names using nslookup against specific recursive and authoritative servers.
  2. Run ipconfig /all and inspect the complete adapter configuration.
  3. Inspect ARP neighbor entries and investigate conflicting IP-MAC associations.
  4. Inspect and correct routes using ip route commands.

Explanation

Correct Answer

D:

Route tables define gateway and interface selection. The linux kernel route table prefers the wrong default.

Incorrect Answers

A:

Querying affected names using nslookup against specific recursive and authoritative servers would not inspect and correct routes using ip route commands.

B:

Running ipconfig /all and inspecting the complete adapter configuration would not inspect and correct routes using ip route commands.

C:

Inspecting ARP neighbor entries and investigating conflicting IP-MAC associations would not inspect and correct routes using ip route commands.

Question 781

A network team addresses this situation: A Linux server reaches its local segment but chooses the wrong default gateway after adding a second NIC. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Run ip route get for a remote address after correction.
  2. Compare lookup results at client and authoritative server.
  3. Watch gateway MAC mapping and check authorized switch-port source.
  4. Compare reported lease parameters with the intended subnet and DHCP scope.

Explanation

Correct Answer

A:

Run ip route get for a remote address after correction.

Incorrect Answers

B:

Different answers identify stale or incorrect resolution. It does not run ip route get for a remote address after correction.

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves running ip route get for a remote address after correction.

D:

DHCP assigns client network parameters through a supported lease exchange. It does not run ip route get for a remote address after correction.

Question 782

A network specialist investigates this evidence: A Linux server reaches its local segment but chooses the wrong default gateway after adding a second NIC. Which underlying condition BEST explains the observed failure or requirement?

  1. Copper wiring arrangement is not certified.
  2. The Linux kernel route table prefers the wrong default.
  3. The issue is likely DNS resolution rather than raw IP connectivity.
  4. Local interface IP configuration is not documented.

Explanation

Correct Answer

B:

The Linux kernel route table prefers the wrong default. Route tables define gateway and interface selection.

Incorrect Answers

A:

Continuity alone misses some pair construction defects. That does not establish a valid Layer 3 route toward the remote subnet.

C:

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That does not establish a valid Layer 3 route toward the remote subnet.

D:

Local interface IP configuration is not documented. That does not establish a valid Layer 3 route toward the remote subnet.

Question 783

A network team observes: Hosts intermittently reach a gateway whose MAC address keeps changing after a rogue device joins the LAN. What is the MOST appropriate corrective action or technical decision?

  1. Run ipconfig /all and inspect the complete adapter configuration.
  2. Use tcpdump or equivalent packet capture on the relevant interface.
  3. Inspect ARP neighbor entries and investigate conflicting IP-MAC associations.
  4. Inspect and correct routes using ip route commands.

Explanation

Correct Answer

C:

ARP maps IPv4 neighbors to local Ethernet addresses. Arp neighbor mappings are unstable or spoofed.

Incorrect Answers

A:

Running ipconfig /all and inspecting the complete adapter configuration would not inspect ARP neighbor entries and investigate conflicting IP-MAC associations.

B:

Using tcpdump or equivalent packet capture on the relevant interface would not inspect ARP neighbor entries and investigate conflicting IP-MAC associations.

D:

Inspecting and correcting routes using ip route commands would not inspect ARP neighbor entries and investigate conflicting IP-MAC associations.

Question 784

A network team addresses this situation: Hosts intermittently reach a gateway whose MAC address keeps changing after a rogue device joins the LAN. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Compare reported lease parameters with the intended subnet and DHCP scope.
  2. Correlate SYN/SYN-ACK captures from both endpoints.
  3. Run ip route get for a remote address after correction.
  4. Watch gateway MAC mapping and check authorized switch-port source.

Explanation

Correct Answer

D:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves watch gateway MAC mapping and check authorized switch-port source.

Incorrect Answers

A:

DHCP assigns client network parameters through a supported lease exchange. Verification of this result involves watch gateway MAC mapping and check authorized switch-port source.

B:

Directional packet evidence isolates the failing leg. That check cannot demonstrate an authorized inter-subnet routed path.

C:

Run ip route get for a remote address after correction. That check cannot demonstrate an authorized inter-subnet routed path.

Question 785

A network specialist investigates this evidence: Hosts intermittently reach a gateway whose MAC address keeps changing after a rogue device joins the LAN. Which underlying condition BEST explains the observed failure or requirement?

  1. ARP neighbor mappings are unstable or spoofed.
  2. Local interface IP configuration is not documented.
  3. The Linux kernel route table prefers the wrong default.
  4. Packet-level timing is not visible in basic connection logs.

Explanation

Correct Answer

A:

ARP neighbor mappings are unstable or spoofed. ARP maps IPv4 neighbors to local Ethernet addresses.

Incorrect Answers

B:

Local interface IP configuration is not documented. That does not establish correct Layer 2 next-hop resolution for the intended IP route.

C:

IP routing depends on a route to the destination prefix and a reachable next hop. That does not establish correct Layer 2 next-hop resolution for the intended IP route.

D:

Packet-level timing is not visible in basic connection logs. That does not establish correct Layer 2 next-hop resolution for the intended IP route.

Question 786

A network team observes: An administrator needs to inventory listening TCP ports on an owned test server in a scheduled assessment. What is the MOST appropriate corrective action or technical decision?

  1. Use tcpdump or equivalent packet capture on the relevant interface.
  2. Run a tightly scoped authorized Nmap TCP scan.
  3. Inspect sockets with ss or netstat to confirm the intended listener.
  4. Use ping with expected ICMP filtering caveats to test echo reachability.

Explanation

Correct Answer

B:

Port scans enumerate reachable listeners but do not prove vulnerabilities. Remote reachable service inventory is unknown.

Incorrect Answers

A:

Using tcpdump or equivalent packet capture on the relevant interface would not run a tightly scoped authorized Nmap TCP scan.

C:

Inspecting sockets with ss or netstat to confirm the intended listener would not run a tightly scoped authorized Nmap TCP scan.

D:

Using ping with expected ICMP filtering caveats to test echo reachability would not run a tightly scoped authorized Nmap TCP scan.

Question 787

A network team addresses this situation: An administrator needs to inventory listening TCP ports on an owned test server in a scheduled assessment. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Examine TTL and validation-related response fields.
  2. Correlate SYN/SYN-ACK captures from both endpoints.
  3. Compare scan findings with locally bound sockets and firewall rules.
  4. Compare echo results from local and remote VLAN clients.

Explanation

Correct Answer

C:

Stateful firewalls can distinguish permitted connection initiation from return traffic. Verification of this result involves comparing scan findings with locally bound sockets and firewall rules.

Incorrect Answers

A:

Examine TTL and validation-related response fields. That check cannot demonstrate the defined inbound-versus-return session policy.

B:

Directional packet evidence isolates the failing leg. That check cannot demonstrate the defined inbound-versus-return session policy.

D:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That check cannot demonstrate the defined inbound-versus-return session policy.

Question 788

A network specialist investigates this evidence: An administrator needs to inventory listening TCP ports on an owned test server in a scheduled assessment. Which underlying condition BEST explains the observed failure or requirement?

  1. The diagnostic requires detailed DNS protocol response inspection.
  2. Basic IP connectivity has not been tested.
  3. Packet-level timing is not visible in basic connection logs.
  4. Remote reachable service inventory is unknown.

Explanation

Correct Answer

D:

Remote reachable service inventory is unknown. Port scans enumerate reachable listeners but do not prove vulnerabilities.

Incorrect Answers

A:

DNS resolution maps hostnames to records and can fail independently of packet forwarding. That does not establish remote reachable service inventory is unknown.

B:

Basic IP connectivity has not been tested. That does not establish remote reachable service inventory is unknown.

C:

Packet-level timing is not visible in basic connection logs. That does not establish remote reachable service inventory is unknown.

Question 789

A network team observes: A patch panel is undocumented and engineers need to identify which adjacent managed switch connects to a core port. What is the MOST appropriate corrective action or technical decision?

  1. Inspect LLDP or CDP neighbor information on the managed interface.
  2. Use a visual fault locator within its supported safety limits to trace or identify the break.
  3. Use tcpdump or equivalent packet capture on the relevant interface.
  4. Run traceroute or tracert and interpret TTL-expiry responses.

Explanation

Correct Answer

A:

Discovery advertisements reveal directly adjacent device and port identifiers.

Incorrect Answers

B:

Using a visual fault locator within its supported safety limits to trace or identify the break would not inspect LLDP or CDP neighbor information on the managed interface.

C:

Using tcpdump or equivalent packet capture on the relevant interface would not inspect LLDP or CDP neighbor information on the managed interface.

D:

Running traceroute or tracert and interpreting TTL-expiry responses would not inspect LLDP or CDP neighbor information on the managed interface.

Question 790

A network team addresses this situation: A patch panel is undocumented and engineers need to identify which adjacent managed switch connects to a core port. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Correlate SYN/SYN-ACK captures from both endpoints.
  2. Compare peer-reported port ID with physical cable tracing.
  3. Observe permitted leakage at the damaged point and retest the repaired fiber.
  4. Watch gateway MAC mapping and check authorized switch-port source.

Explanation

Correct Answer

B:

Neighbor and physical map consistency validate adjacency.

Incorrect Answers

A:

Directional packet evidence isolates the failing leg. It does not compare peer-reported port ID with physical cable tracing.

C:

Physical break identification validates the tool choice. It does not compare peer-reported port ID with physical cable tracing.

D:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves comparing peer-reported port ID with physical cable tracing.


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