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CompTIA N10-009 Practice Test 21

Question 200

A network team addresses this situation: An upstream BGP peer suddenly advertises a default route and private prefixes not authorized by policy. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Trace traffic to an unlisted external address via the border.
  2. Look up addresses inside and outside the /24 to compare selected paths.
  3. Power off the active gateway and time reachability through the standby.
  4. Inspect accepted route entries after injecting a prohibited test prefix.

Explanation

Correct Answer

D:

Inspect accepted route entries after injecting a prohibited test prefix.

Incorrect Answers

A:

The first routed hop confirms default forwarding. It does not inspect accepted route entries after injecting a prohibited test prefix.

B:

Look up addresses inside and outside the /24 to compare selected paths. It does not inspect accepted route entries after injecting a prohibited test prefix.

C:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone.

Question 201

A network specialist investigates this evidence: An upstream BGP peer suddenly advertises a default route and private prefixes not authorized by policy. Which underlying condition BEST explains the observed failure or requirement?

  1. The neighbor import policy accepts unwanted networks.
  2. No gateway of last resort is installed.
  3. Address-only one-to-one NAT cannot distinguish all concurrent shared flows.
  4. Longest-prefix selection has priority over a broader route's metric.

Explanation

Correct Answer

A:

The neighbor import policy accepts unwanted networks. BGP policy controls which externally learned routes enter selection.

Incorrect Answers

B:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves the neighbor import policy accepts unwanted networks.

C:

NAT rewrites connection addresses or ports according to an explicit translation rule. That does not establish the neighbor import policy accepts unwanted networks.

D:

Longest-prefix selection has priority over a broader route's metric. That does not establish the neighbor import policy accepts unwanted networks.

Question 202

A network team observes: A router learns the same 172.20.0.0/16 via static and OSPF routes, but uses the static route even with a higher OSPF bandwidth. What is the MOST appropriate corrective action or technical decision?

  1. Add an approved 0.0.0.0/0 default route to the border gateway.
  2. Adjust intended administrative preferences or remove the unwanted static route.
  3. Correct the OSPF area on the affected interface to match its intended neighbor.
  4. Correct the /24 next hop or prefix if its route is undesirable.

Explanation

Correct Answer

B:

Administrative distance chooses among route sources before metrics of each protocol. Route source preference precedes path metric when prefixes match.

Incorrect Answers

A:

Adding an approved 0.0.0.0/0 default route to the border gateway would not adjust intended administrative preferences or remove the unwanted static route.

C:

Correcting the OSPF area on the affected interface to match its intended neighbor would not adjust intended administrative preferences or remove the unwanted static route.

D:

Correcting the /24 next hop or prefix if its route is undesirable would not adjust intended administrative preferences or remove the unwanted static route.

Question 203

A network team addresses this situation: A router learns the same 172.20.0.0/16 via static and OSPF routes, but uses the static route even with a higher OSPF bandwidth. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Trace traffic to an unlisted external address via the border.
  2. Ping both gateway subinterfaces and capture their VLAN tags.
  3. Verify the selected route source and next hop after controlled policy change.
  4. Look up addresses inside and outside the /24 to compare selected paths.

Explanation

Correct Answer

C:

IP routing depends on a route to the destination prefix and a reachable next hop. Verification of this result involves verifying the selected route source and next hop after controlled policy change.

Incorrect Answers

A:

The first routed hop confirms default forwarding. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

B:

Per-VLAN tags and gateway success demonstrate inter-VLAN routing. Verification of this result involves verifying the selected route source and next hop after controlled policy change.

D:

Look up addresses inside and outside the /24 to compare selected paths. That check cannot demonstrate a valid Layer 3 route toward the remote subnet.

Question 204

A network specialist investigates this evidence: A router learns the same 172.20.0.0/16 via static and OSPF routes, but uses the static route even with a higher OSPF bandwidth. Which underlying condition BEST explains the observed failure or requirement?

  1. No gateway of last resort is installed.
  2. The route table lacks a valid destination prefix entry.
  3. The trunk lacks matching 802.1Q routed subinterfaces.
  4. Route source preference precedes path metric when prefixes match.

Explanation

Correct Answer

D:

Route source preference precedes path metric when prefixes match. Administrative distance chooses among route sources before metrics of each protocol.

Incorrect Answers

A:

Communication between different IP subnets requires a routed interface or gateway rather than Layer 2 bridging alone. The missing change involves routing source preference precedes path metric when prefixes match.

B:

IP routing depends on a route to the destination prefix and a reachable next hop. That does not route source preference precedes path metric when prefixes match.

C:

VLAN membership and 802.1Q tagging determine which Layer 2 broadcast domain carries each frame. That does not route source preference precedes path metric when prefixes match.

Question 205

A network team observes: A /24 route has a higher metric than a /16 route, yet packets inside the /24 follow the specific entry. What is the MOST appropriate corrective action or technical decision?

  1. Correct the /24 next hop or prefix if its route is undesirable.
  2. Adjust intended administrative preferences or remove the unwanted static route.
  3. Enforce symmetric translated session routing or supported state synchronization.
  4. Apply explicit inbound prefix and route-policy filtering on the BGP session.

Explanation

Correct Answer

A:

Longer matching network masks are evaluated before metric comparison. Longest-prefix selection has priority over a broader route's metric.

Incorrect Answers

B:

Adjusting intended administrative preferences or remove the unwanted static route would not correct the /24 next hop or prefix if its route is undesirable.

C:

Enforcing symmetric translated session routing or supported state synchronization would not correct the /24 next hop or prefix if its route is undesirable.

D:

Applying explicit inbound prefix and routing-policy filtering on the BGP session would not correct the /24 next hop or prefix if its route is undesirable.

Question 206

A network team addresses this situation: A /24 route has a higher metric than a /16 route, yet packets inside the /24 follow the specific entry. After the corrective action, which test or result BEST verifies that the problem is resolved?

  1. Verify the selected route source and next hop after controlled policy change.
  2. Look up addresses inside and outside the /24 to compare selected paths.
  3. Inspect accepted route entries after injecting a prohibited test prefix.
  4. Trace traffic to an unlisted external address via the border.

Explanation

Correct Answer

B:

Look up addresses inside and outside the /24 to compare selected paths.

Incorrect Answers

A:

IP routing depends on a route to the destination prefix and a reachable next hop. That check cannot demonstrate look up addresses inside and outside the /24 to compare selected paths.

C:

Inspect accepted route entries after injecting a prohibited test prefix. That check cannot demonstrate look up addresses inside and outside the /24 to compare selected paths.

D:

The first routed hop confirms default forwarding. That check cannot demonstrate look up addresses inside and outside the /24 to compare selected paths.

Question 207

A network specialist investigates this evidence: A /24 route has a higher metric than a /16 route, yet packets inside the /24 follow the specific entry. Which underlying condition BEST explains the observed failure or requirement?

  1. Route source preference precedes path metric when prefixes match.
  2. The neighbor import policy accepts unwanted networks.
  3. Longest-prefix selection has priority over a broader route's metric.
  4. The return path lacks the original translation state.

Explanation

Correct Answer

C:

Longest-prefix selection has priority over a broader route's metric. Longer matching network masks are evaluated before metric comparison.

Incorrect Answers

A:

Route source preference precedes path metric when prefixes match. That does not establish longest-prefix selection has priority over a broader route's metric.

B:

The neighbor import policy accepts unwanted networks. That does not establish longest-prefix selection has priority over a broader route's metric.

D:

Stateful NAT requires return traffic to match its stored flow mapping. That does not establish longest-prefix selection has priority over a broader route's metric.

Question 208

A network team observes: Hundreds of private office clients need outbound access through one public IPv4 address. What is the MOST appropriate corrective action or technical decision?

  1. Configure a carefully restricted static NAT mapping with firewall policy.
  2. Enforce symmetric translated session routing or supported state synchronization.
  3. Establish appropriately filtered eBGP neighbor sessions with approved prefix advertisements.
  4. Use source port address translation with unique session port mappings.

Explanation

Correct Answer

D:

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

Incorrect Answers

A:

Configuring a carefully restricted static NAT mapping with firewall policy would not meet the need for source port address translation with unique session port mappings.

B:

Enforcing symmetric translated session routing or supported state synchronization would not meet the need for source port address translation with unique session port mappings.

C:

Establishing appropriately filtered eBGP neighbor sessions with approved prefix advertisements would not meet the need for source port address translation with unique session port mappings.

Question 209

A network team addresses this situation: Hundreds of private office clients need outbound access through one public IPv4 address. 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. Connect from an approved external host and inspect the NAT entry.
  3. Trace both directions and confirm state lookup on the reply firewall.
  4. Inspect accepted route entries after injecting a prohibited test prefix.

Explanation

Correct Answer

A:

Open simultaneous outbound sessions from two internal hosts and inspect translations.

Incorrect Answers

B:

Inbound mapped traffic validates the fixed mapping. That check cannot demonstrate open simultaneous outbound sessions from two internal hosts and inspect translations.

C:

Stateful firewalls can distinguish permitted connection initiation from return traffic. That check cannot demonstrate open simultaneous outbound sessions from two internal hosts and inspect translations.

D:

Inspect accepted route entries after injecting a prohibited test prefix. That check cannot demonstrate open simultaneous outbound sessions from two internal hosts and inspect translations.

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.


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