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CompTIA N10-009 Practice Test 71

Question 700

A network team addresses this situation: Users resolve app.example.net to an old address that no longer hosts the service, while direct new-IP connections work. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Renew multiple new clients and inspect free address count.
  2. Inspect server-side relay packets from that VLAN.
  3. Inspect the port VLAN and renew the intended sales DHCP lease.
  4. Query authoritative and recursive records and retest hostname connection.

Explanation

Correct Answer

D:

Correct answers and service connection validate DNS repair.

Incorrect Answers

A:

Renew multiple new clients and inspect free address count. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.

B:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.

C:

DHCP assigns client network parameters through a supported lease exchange. That check cannot demonstrate query authoritative and recursive records and retest hostname connection.

Question 701

A network specialist investigates this evidence: Users resolve app.example.net to an old address that no longer hosts the service, while direct new-IP connections work. Which underlying condition BEST explains the observed failure or requirement?

  1. The authoritative A record is stale.
  2. The DHCP address pool has no usable remaining leases.
  3. The VLAN's router interface lacks a DHCP relay destination.
  4. The oversized mask causes an incorrect on-link decision.

Explanation

Correct Answer

A:

The authoritative A record is stale. Name resolution is sending clients to the wrong IPv4 destination.

Incorrect Answers

B:

DHCP assigns client network parameters through a supported lease exchange. That does not establish the authoritative A record is stale.

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves the authoritative A record is stale.

D:

The oversized mask causes an incorrect on-link decision. That does not establish the authoritative A record is stale.

Question 702

A network team observes: An alias references another alias that points back to the first, causing resolution failure. What is the MOST appropriate corrective action or technical decision?

  1. Update the A record and manage resolver cache TTL during migration.
  2. Remove the alias loop and point the chain to a valid canonical hostname.
  3. Correct the DHCP router option to the actual local gateway.
  4. Set controlled root priorities and appropriate BPDU guard/root guard.

Explanation

Correct Answer

B:

A CNAME chain must eventually resolve to address data. Circular cname configuration prevents a terminal address resolution.

Incorrect Answers

A:

Updating the A record and managing resolver cache TTL during migration would not remove the alias loop and point the chain to a valid canonical hostname.

C:

Correcting the DHCP router option to the actual local gateway would not remove the alias loop and point the chain to a valid canonical hostname.

D:

Setting controlled root priorities and appropriate BPDU guard/root guard would not remove the alias loop and point the chain to a valid canonical hostname.

Question 703

A network team addresses this situation: An alias references another alias that points back to the first, causing resolution failure. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Query authoritative and recursive records and retest hostname connection.
  2. Inspect server-side relay packets from that VLAN.
  3. Trace the alias chain with dig and confirm final A or AAAA records.
  4. Capture SYN and SYN-ACK on both sides of the filtering point.

Explanation

Correct Answer

C:

Trace the alias chain with dig and confirm final A or AAAA records.

Incorrect Answers

A:

Correct answers and service connection validate DNS repair. That check cannot demonstrate trace the alias chain with dig and confirm final A or AAAA records.

B:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That check cannot demonstrate trace the alias chain with dig and confirm final A or AAAA records.

D:

TCP connections require an accepted SYN, SYN-ACK and ACK exchange before application requests. That check cannot demonstrate trace the alias chain with dig and confirm final A or AAAA records.

Question 704

A network specialist investigates this evidence: An alias references another alias that points back to the first, causing resolution failure. Which underlying condition BEST explains the observed failure or requirement?

  1. The authoritative A record is stale.
  2. An uncontrolled Layer 2 loop produces repeated frames.
  3. Duplicate host addressing causes ARP instability.
  4. Circular CNAME configuration prevents a terminal address resolution.

Explanation

Correct Answer

D:

Circular CNAME configuration prevents a terminal address resolution. A CNAME chain must eventually resolve to address data.

Incorrect Answers

A:

Name resolution is sending clients to the wrong IPv4 destination. That does not establish circular CNAME configuration prevents a terminal address resolution.

B:

An uncontrolled Layer 2 loop produces repeated frames. That does not establish circular CNAME configuration prevents a terminal address resolution.

C:

One IP cannot reliably identify two simultaneous hosts. That does not establish circular CNAME configuration prevents a terminal address resolution.

Question 705

A network team observes: Clients in a new VLAN never receive leases, but same-LAN users next to the DHCP server work. What is the MOST appropriate corrective action or technical decision?

  1. Add the correct IP helper to forward DHCP requests to the server.
  2. Correct access VLAN membership to VLAN 30.
  3. Permit VLAN 90 on approved trunk ports with consistent tagging.
  4. Install the appropriate upstream default route with healthy next hop.

Explanation

Correct Answer

A:

Routed interfaces do not pass client broadcasts without relay. The vlan's router interface lacks a dhcp relay destination.

Incorrect Answers

B:

Correcting access VLAN membership to VLAN 30 would not add the correct IP helper to forward DHCP requests to the server.

C:

Permitting VLAN 90 on approved trunk ports with consistent tagging would not add the correct IP helper to forward DHCP requests to the server.

D:

Installing the appropriate upstream default route with healthy next hop would not add the correct IP helper to forward DHCP requests to the server.

Question 706

A network team addresses this situation: Clients in a new VLAN never receive leases, but same-LAN users next to the DHCP server work. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Check route and ping gateway then a remote address.
  2. Inspect server-side relay packets from that VLAN.
  3. Query authoritative and recursive records and retest hostname connection.
  4. Inspect the port VLAN and renew the intended sales DHCP lease.

Explanation

Correct Answer

B:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. Verification of this result involves inspecting server-side relay packets from that VLAN.

Incorrect Answers

A:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves inspecting server-side relay packets from that VLAN.

C:

Correct answers and service connection validate DNS repair. That check cannot demonstrate correct switch VLAN and trunk classification.

D:

DHCP assigns client network parameters through a supported lease exchange. Verification of this result involves inspecting server-side relay packets from that VLAN.

Question 707

A network team observes: A DHCP server offers a gateway address already statically assigned to a firewall. What is the MOST appropriate corrective action or technical decision?

  1. Assign unique addresses and correct reservations in IPAM.
  2. Correct the DHCP router option to the actual local gateway.
  3. Exclude the gateway address and clear conflicting leases safely.
  4. Add the correct IP helper to forward DHCP requests to the server.

Explanation

Correct Answer

C:

Static network addresses must not be issued dynamically. Infrastructure address was not excluded from the scope.

Incorrect Answers

A:

Assigning unique addresses and correcting reservations in IPAM would not exclude the gateway address and clear conflicting leases safely.

B:

Correcting the DHCP router option to the actual local gateway would not exclude the gateway address and clear conflicting leases safely.

D:

Adding the correct IP helper to forward DHCP requests to the server would not exclude the gateway address and clear conflicting leases safely.

Question 708

A network team addresses this situation: A DHCP server offers a gateway address already statically assigned to a firewall. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Observe ARP mappings stabilize and both printers respond on unique IPs.
  2. Inspect server-side relay packets from that VLAN.
  3. Check route and ping gateway then a remote address.
  4. Request several leases and confirm gateway never appears in offers.

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 request several leases and confirm gateway never appears in offers.

Incorrect Answers

A:

A forwarded frame uses the local next-hop MAC even when its encapsulated IP destination stays constant. That check cannot demonstrate an authorized inter-subnet routed path.

B:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. Verification of this result involves request several leases and confirm gateway never appears in offers.

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves request several leases and confirm gateway never appears in offers. The observed condition is a network team addresses this situation: A DHCP server offers a gateway address already statically assigned to a firewall. After the corrective action,.

Question 709

A network specialist investigates this evidence: A DHCP server offers a gateway address already statically assigned to a firewall. Which underlying condition BEST explains the observed failure or requirement?

  1. Infrastructure address was not excluded from the scope.
  2. Duplicate host addressing causes ARP instability.
  3. Default-gateway address is not a reachable local next hop.
  4. The VLAN's router interface lacks a DHCP relay destination.

Explanation

Correct Answer

A:

Infrastructure address was not excluded from the scope. Static network addresses must not be issued dynamically.

Incorrect Answers

B:

One IP cannot reliably identify two simultaneous hosts. That does not establish successful client IP addressing from the correct scope.

C:

IP routing depends on a route to the destination prefix and a reachable next hop. That does not establish successful client IP addressing from the correct scope.

D:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves infrastructure address was not excluded from the scope.

Question 710

A network team observes: A new unmanaged access switch causes frequent root bridge changes and spanning-tree reconvergence. What is the MOST appropriate corrective action or technical decision?

  1. Find the added loop and restore spanning-tree protection.
  2. Set controlled root priorities and appropriate BPDU guard/root guard.
  3. Expand the subnet scope or reclaim expired reservations after planning.
  4. Correct access VLAN membership to VLAN 30.

Explanation

Correct Answer

B:

Root guard prevents unauthorized switches becoming topology root. Root election is not protected from inferior edge equipment.

Incorrect Answers

A:

Finding the added loop and restoring spanning-tree protection would not set controlled root priorities and appropriate BPDU guard/root guard. Root guard prevents unauthorized switches becoming topology root.

C:

Expanding the subnet scope or reclaim expired reservations after planning would not set controlled root priorities and appropriate BPDU guard/root guard.

D:

Correcting access VLAN membership to VLAN 30 would not set controlled root priorities and appropriate BPDU guard/root guard. Root guard prevents unauthorized switches becoming topology root.


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