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Last Update: Nov 14, 2026

N10-009 Training Course: 240 Video Lectures

N10-009 PDF Study Guide: 128 Pages

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CompTIA N10-009 Practice Test 22

Question 210

A network specialist investigates this evidence: Hundreds of private office clients need outbound access through one public IPv4 address. Which underlying condition BEST explains the observed failure or requirement?

  1. The internet-facing service lacks a deterministic inbound translation.
  2. Address-only one-to-one NAT cannot distinguish all concurrent shared flows.
  3. The return path lacks the original translation state.
  4. Internet external routing requires interdomain policy exchange.

Explanation

Correct Answer

B:

Address-only one-to-one NAT cannot distinguish all concurrent shared flows. PAT shares one public IP by translating source ports and recording flows.

Incorrect Answers

A:

The internet-facing service lacks a deterministic inbound translation. That does not establish the intended translated source or destination path.

C:

Stateful NAT requires return traffic to match its stored flow mapping. That does not establish the intended translated source or destination path.

D:

Internet external routing requires interdomain policy exchange. That does not establish the intended translated source or destination path.

Question 211

A network team observes: An internal published service needs a stable externally reachable address while keeping private internal addressing. What is the MOST appropriate corrective action or technical decision?

  1. Use source port address translation with unique session port mappings.
  2. Apply explicit inbound prefix and route-policy filtering on the BGP session.
  3. Configure a carefully restricted static NAT mapping with firewall policy.
  4. Add a specific static route toward the reachable upstream next hop.

Explanation

Correct Answer

C:

Static translation provides a repeatable public-to-private address relationship. The internet-facing service lacks a deterministic inbound translation.

Incorrect Answers

A:

Using source port address translation with unique session port mappings would not configure a carefully restricted static NAT mapping with firewall policy.

B:

Applying explicit inbound prefix and routing-policy filtering on the BGP session would not configure a carefully restricted static NAT mapping with firewall policy.

D:

Adding a specific static route toward the reachable upstream next hop would not configure a carefully restricted static NAT mapping with firewall policy.

Question 212

A network team addresses this situation: An internal published service needs a stable externally reachable address while keeping private internal addressing. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Open simultaneous outbound sessions from two internal hosts and inspect translations.
  2. Verify the selected route source and next hop after controlled policy change.
  3. Show the route table and verify traffic reaches the remote prefix.
  4. Connect from an approved external host and inspect the NAT entry.

Explanation

Correct Answer

D:

Inbound mapped traffic validates the fixed mapping.

Incorrect Answers

A:

Open simultaneous outbound sessions from two internal hosts and inspect translations. That check cannot demonstrate the intended translated source or destination path.

B:

IP routing depends on a route to the destination prefix and a reachable next hop. That check cannot demonstrate the intended translated source or destination path.

C:

Route presence and packet delivery prove forwarding. That check cannot demonstrate the intended translated source or destination path.

Question 213

A network specialist investigates this evidence: An internal published service needs a stable externally reachable address while keeping private internal addressing. Which underlying condition BEST explains the observed failure or requirement?

  1. The internet-facing service lacks a deterministic inbound translation.
  2. Address-only one-to-one NAT cannot distinguish all concurrent shared flows.
  3. The neighbor import policy accepts unwanted networks.
  4. Route source preference precedes path metric when prefixes match.

Explanation

Correct Answer

A:

The internet-facing service lacks a deterministic inbound translation. Static translation provides a repeatable public-to-private address relationship.

Incorrect Answers

B:

NAT rewrites connection addresses or ports according to an explicit translation rule. That does not establish the internet-facing service lacks a deterministic inbound translation.

C:

The neighbor import policy accepts unwanted networks. That does not establish the internet-facing service lacks a deterministic inbound translation.

D:

Route source preference precedes path metric when prefixes match. That does not establish the internet-facing service lacks a deterministic inbound translation.

Question 214

A network team observes: Clients lose connectivity when their only default-gateway router reboots although a second router is healthy. What is the MOST appropriate corrective action or technical decision?

  1. Create correctly tagged router subinterfaces with each VLAN gateway address.
  2. Deploy a supported first-hop redundancy group with a shared virtual IP.
  3. Apply explicit inbound prefix and route-policy filtering on the BGP session.
  4. Add a specific static route toward the reachable upstream next hop.

Explanation

Correct Answer

B:

An FHRP lets hosts retain a stable gateway during router failure. Hosts depend on a single physical gateway rather than a redundant virtual address.

Incorrect Answers

A:

Creating correctly tagged router subinterfaces with each VLAN gateway address would not deploy a supported first-hop redundancy group with a shared virtual IP.

C:

Applying explicit inbound prefix and routing-policy filtering on the BGP session would not deploy a supported first-hop redundancy group with a shared virtual IP.

D:

Adding a specific static route toward the reachable upstream next hop would not deploy a supported first-hop redundancy group with a shared virtual IP.

Question 215

A network team addresses this situation: Clients lose connectivity when their only default-gateway router reboots although a second router is healthy. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Ping both gateway subinterfaces and capture their VLAN tags.
  2. Inspect accepted route entries after injecting a prohibited test prefix.
  3. Power off the active gateway and time reachability through the standby.
  4. Show the route table and verify traffic reaches the remote prefix.

Explanation

Correct Answer

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves power off the active gateway and time reachability through the standby.

Incorrect Answers

A:

Per-VLAN tags and gateway success demonstrate inter-VLAN routing.

B:

Inspect accepted route entries after injecting a prohibited test prefix. That check cannot demonstrate an authorized inter-subnet routed path.

D:

Route presence and packet delivery prove forwarding. That check cannot demonstrate an authorized inter-subnet routed path.

Question 216

A network specialist investigates this evidence: Clients lose connectivity when their only default-gateway router reboots although a second router is healthy. Which underlying condition BEST explains the observed failure or requirement?

  1. The trunk lacks matching 802.1Q routed subinterfaces.
  2. The neighbor import policy accepts unwanted networks.
  3. The route table lacks a valid destination prefix entry.
  4. Hosts depend on a single physical gateway rather than a redundant virtual address.

Explanation

Correct Answer

D:

Hosts depend on a single physical gateway rather than a redundant virtual address. An FHRP lets hosts retain a stable gateway during router failure.

Incorrect Answers

A:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That does not establish an authorized inter-subnet routed path.

B:

The neighbor import policy accepts unwanted networks. The missing change involves hosts depend on a single physical gateway rather than a redundant virtual address.

C:

IP routing depends on a route to the destination prefix and a reachable next hop. That does not establish an authorized inter-subnet routed path.

Question 217

A network team observes: A router-on-a-stick link carries VLAN 20 and 30 frames but neither subnet can reach its proper routed gateway. What is the MOST appropriate corrective action or technical decision?

  1. Create correctly tagged router subinterfaces with each VLAN gateway address.
  2. Deploy a supported first-hop redundancy group with a shared virtual IP.
  3. Correct EIGRP metric-related interface parameters under the approved routing design.
  4. Adjust intended administrative preferences or remove the unwanted static route.

Explanation

Correct Answer

A:

One physical interface can terminate multiple VLANs through tagged subinterfaces. The trunk lacks matching 802.1q routed subinterfaces.

Incorrect Answers

B:

Deploying a supported first-hop redundancy group with a shared virtual IP would not create correctly tagged router subinterfaces with each VLAN gateway address.

C:

Correcting EIGRP metric-related interface parameters under the approved routing design would not create correctly tagged router subinterfaces with each VLAN gateway address.

D:

Adjusting intended administrative preferences or remove the unwanted static route would not create correctly tagged router subinterfaces with each VLAN gateway address.

Question 218

A network team addresses this situation: A router-on-a-stick link carries VLAN 20 and 30 frames but neither subnet can reach its proper routed gateway. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Review successor routes and metrics after correction.
  2. Ping both gateway subinterfaces and capture their VLAN tags.
  3. Verify the selected route source and next hop after controlled policy change.
  4. Power off the active gateway and time reachability through the standby.

Explanation

Correct Answer

B:

Per-VLAN tags and gateway success demonstrate inter-VLAN routing. Verification of this result involves ping both gateway subinterfaces and capture their VLAN tags.

Incorrect Answers

A:

Expected successor choice validates the metric correction. That check cannot demonstrate an authorized inter-subnet routed path.

C:

IP routing depends on a route to the destination prefix and a reachable next hop. That check cannot demonstrate an authorized inter-subnet routed path.

D:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. Verification of this result involves ping both gateway subinterfaces and capture their VLAN tags.

Question 219

A network specialist investigates this evidence: A router-on-a-stick link carries VLAN 20 and 30 frames but neither subnet can reach its proper routed gateway. Which underlying condition BEST explains the observed failure or requirement?

  1. Hosts depend on a single physical gateway rather than a redundant virtual address.
  2. Configured metrics do not describe the intended path cost.
  3. The trunk lacks matching 802.1Q routed subinterfaces.
  4. Route source preference precedes path metric when prefixes match.

Explanation

Correct Answer

C:

The trunk lacks matching 802.1Q routed subinterfaces. One physical interface can terminate multiple VLANs through tagged subinterfaces.

Incorrect Answers

A:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves the trunk lacks matching 802.1Q routed subinterfaces.

B:

Configured metrics do not describe the intended path cost. That does not establish correct switch VLAN and trunk classification.

D:

Route source preference precedes path metric when prefixes match. That does not establish correct switch VLAN and trunk classification.

Question 220

A network team observes: A routed campus uses EIGRP but a low-bandwidth link is preferred because its reported interface metrics are inconsistent. What is the MOST appropriate corrective action or technical decision?

  1. Create correctly tagged router subinterfaces with each VLAN gateway address.
  2. Enforce symmetric translated session routing or supported state synchronization.
  3. Adjust intended administrative preferences or remove the unwanted static route.
  4. Correct EIGRP metric-related interface parameters under the approved routing design.

Explanation

Correct Answer

D:

EIGRP path selection uses protocol metrics including bandwidth and delay. Configured metrics do not describe the intended path cost.

Incorrect Answers

A:

Creating correctly tagged router subinterfaces with each VLAN gateway address would not correct EIGRP metric-related interface parameters under the approved routing design.

B:

Enforcing symmetric translated session routing or supported state synchronization would not correct EIGRP metric-related interface parameters under the approved routing design.

C:

Adjusting intended administrative preferences or remove the unwanted static route would not correct EIGRP metric-related interface parameters under the approved routing design.


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