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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 25

Question 240

A router learns the same destination from connected and static paths. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Read only configured route statements without checking the actual installed forwarding choice
  2. Compare two different destination addresses and infer preference for the same matched prefix
  3. Ping an unaffected network instead of inspecting the exact route selected for the conflicting destination
  4. Inspect chosen route for the identical destination/prefix

Explanation

Correct Answer

D:

Administrative distance matters when competing route sources offer same prefix. The result of the remedy is checked directly: Inspect chosen route for the identical destination/prefix.

Incorrect Answers

A:

Read only configured route statements without checking the actual installed forwarding choice. Administrative distance matters when competing route sources offer same prefix. The appropriate acceptance test is: Inspect chosen route for the identical destination/prefix.

B:

Compare two different destination addresses and infer preference for the same matched prefix. Administrative distance matters when competing route sources offer same prefix. The appropriate acceptance test is: Inspect chosen route for the identical destination/prefix.

C:

Ping an unaffected network instead of inspecting the exact route selected for the conflicting destination. Administrative distance matters when competing route sources offer same prefix. The appropriate acceptance test is: Inspect chosen route for the identical destination/prefix.

Question 241

A routing table has /16 and /24 entries covering one destination. Which response MOST directly addresses the stated network problem or requirement?

  1. Forward to the /24 next hop even if its source has a higher administrative distance
  2. Choose the /16 route for a destination matching /24 because its source has lower distance
  3. Install a default route and ignore the more-specific /24 entry
  4. Use alphabetical routing-protocol names as a substitute for longest-prefix matching

Explanation

Correct Answer

A:

Prefix specificity precedes administrative-distance comparison across prefixes. A direct way to confirm the outcome is to compare longest prefix then best eligible route.

Incorrect Answers

B:

Choose the /16 route for a destination matching /24 because its source has lower distance. Prefix specificity precedes administrative-distance comparison across prefixes. This does not implement the needed approach: forward to the /24 next hop even if its source has a higher administrative distance.

C:

Install a default route and ignore the more-specific /24 entry. Prefix specificity precedes administrative-distance comparison across prefixes. This does not implement the needed approach: forward to the /24 next hop even if its source has a higher administrative distance.

D:

Use alphabetical routing-protocol names as a substitute for longest-prefix matching. Prefix specificity precedes administrative-distance comparison across prefixes. This does not implement the needed approach: forward to the /24 next hop even if its source has a higher administrative distance.

Question 242

A routing table has /16 and /24 entries covering one destination. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe the router has an active /16 entry but never test the selected /24 next hop
  2. Compare longest prefix then best eligible route
  3. Compare administrative distance across routes with unequal mask lengths as the first decision
  4. Trace a packet to a different /16 destination that does not fall inside the /24

Explanation

Correct Answer

B:

Prefix specificity precedes administrative-distance comparison across prefixes. The result of the remedy is checked directly: Compare longest prefix then best eligible route.

Incorrect Answers

A:

Observe the router has an active /16 entry but never test the selected /24 next hop. Prefix specificity precedes administrative-distance comparison across prefixes. The appropriate acceptance test is: Compare longest prefix then best eligible route.

C:

Compare administrative distance across routes with unequal mask lengths as the first decision. Prefix specificity precedes administrative-distance comparison across prefixes. The appropriate acceptance test is: Compare longest prefix then best eligible route.

D:

Trace a packet to a different /16 destination that does not fall inside the /24. Prefix specificity precedes administrative-distance comparison across prefixes. The appropriate acceptance test is: Compare longest prefix then best eligible route.

Question 243

Two equal-prefix OSPF routes differ in accumulated interface cost. Which response MOST directly addresses the stated network problem or requirement?

  1. Prefer the higher-cost OSPF link solely because it has a larger interface-speed label
  2. Choose an equal-cost multipath group even though the two OSPF candidate metrics differ
  3. Prefer the valid lower-cost path absent equal-cost configuration
  4. Override the OSPF link-state path with a DNS hostname preference

Explanation

Correct Answer

C:

Metric comparison applies within eligible comparable route candidates. A direct way to confirm the outcome is to verify OSPF cost fields and actual forwarding entry.

Incorrect Answers

A:

Prefer the higher-cost OSPF link solely because it has a larger interface-speed label. Metric comparison applies within eligible comparable route candidates. This does not implement the needed approach: prefer the valid lower-cost path absent equal-cost configuration.

B:

Choose an equal-cost multipath group even though the two OSPF candidate metrics differ. Metric comparison applies within eligible comparable route candidates. This does not implement the needed approach: prefer the valid lower-cost path absent equal-cost configuration.

D:

Override the OSPF link-state path with a DNS hostname preference. Metric comparison applies within eligible comparable route candidates. This does not implement the needed approach: prefer the valid lower-cost path absent equal-cost configuration.

Question 244

Two equal-prefix OSPF routes differ in accumulated interface cost. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Check that both routes were learned via OSPF but ignore their accumulated costs
  2. Read one interface's configured bandwidth without calculating the installed OSPF cost
  3. Ping the router's loopback and infer actual lower-cost forwarding selection
  4. Verify OSPF cost fields and actual forwarding entry

Explanation

Correct Answer

D:

Metric comparison applies within eligible comparable route candidates. The result of the remedy is checked directly: Verify OSPF cost fields and actual forwarding entry.

Incorrect Answers

A:

Check that both routes were learned via OSPF but ignore their accumulated costs. Metric comparison applies within eligible comparable route candidates. The appropriate acceptance test is: Verify OSPF cost fields and actual forwarding entry.

B:

Read one interface's configured bandwidth without calculating the installed OSPF cost. Metric comparison applies within eligible comparable route candidates. The appropriate acceptance test is: Verify OSPF cost fields and actual forwarding entry.

C:

Ping the router's loopback and infer actual lower-cost forwarding selection. Metric comparison applies within eligible comparable route candidates. The appropriate acceptance test is: Verify OSPF cost fields and actual forwarding entry.

Question 245

Two internal links share an equal-cost path and should balance flows. Which response MOST directly addresses the stated network problem or requirement?

  1. Configure supported ECMP and consistent return-path considerations
  2. Send all traffic to one next hop while advertising ECMP without installing a second eligible path
  3. Balance packets at random over paths with different delays and ignore sequence reordering
  4. Configure a lower-cost backup and call it equal-cost load sharing without comparing path metrics

Explanation

Correct Answer

A:

Equal-cost paths are not guaranteed per-packet round robin. A direct way to confirm the outcome is to inspect installed next-hop set and traffic distribution over multiple flows.

Incorrect Answers

B:

Send all traffic to one next hop while advertising ECMP without installing a second eligible path. Equal-cost paths are not guaranteed per-packet round robin. This does not implement the needed approach: configure supported ECMP and consistent return-path considerations.

C:

Balance packets at random over paths with different delays and ignore sequence reordering. Equal-cost paths are not guaranteed per-packet round robin. This does not implement the needed approach: configure supported ECMP and consistent return-path considerations.

D:

Configure a lower-cost backup and call it equal-cost load sharing without comparing path metrics. Equal-cost paths are not guaranteed per-packet round robin. This does not implement the needed approach: configure supported ECMP and consistent return-path considerations.

Question 246

Two internal links share an equal-cost path and should balance flows. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify two uplink interfaces are Up but not that both next hops are installed for the prefix
  2. Inspect installed next-hop set and traffic distribution over multiple flows
  3. Measure only one long flow and assume every equal-cost member shares it evenly
  4. Read routing protocol configuration instead of actual per-next-hop flow counters

Explanation

Correct Answer

B:

Equal-cost paths are not guaranteed per-packet round robin. The result of the remedy is checked directly: Inspect installed next-hop set and traffic distribution over multiple flows.

Incorrect Answers

A:

Verify two uplink interfaces are Up but not that both next hops are installed for the prefix. Equal-cost paths are not guaranteed per-packet round robin. The appropriate acceptance test is: Inspect installed next-hop set and traffic distribution over multiple flows.

C:

Measure only one long flow and assume every equal-cost member shares it evenly. Equal-cost paths are not guaranteed per-packet round robin. The appropriate acceptance test is: Inspect installed next-hop set and traffic distribution over multiple flows.

D:

Read routing protocol configuration instead of actual per-next-hop flow counters. Equal-cost paths are not guaranteed per-packet round robin. The appropriate acceptance test is: Inspect installed next-hop set and traffic distribution over multiple flows.

Question 247

An Internet edge must present one public address for many private clients. Which response MOST directly addresses the stated network problem or requirement?

  1. Allocate the same public source port to simultaneous private clients with conflicting translation tuples
  2. Provide one-to-one static NAT to every internal client despite one available public address
  3. Apply PAT with unique transport mappings for concurrent sessions
  4. Remove transport-port mapping from NAT entries and assume concurrent sessions remain distinguishable

Explanation

Correct Answer

C:

PAT disambiguates flows by ports unlike one-to-one static NAT. A direct way to confirm the outcome is to observe NAT translations for distinct source ports under load.

Incorrect Answers

A:

Allocate the same public source port to simultaneous private clients with conflicting translation tuples. PAT disambiguates flows by ports unlike one-to-one static NAT. This does not implement the needed approach: apply PAT with unique transport mappings for concurrent sessions.

B:

Provide one-to-one static NAT to every internal client despite one available public address. PAT disambiguates flows by ports unlike one-to-one static NAT. This does not implement the needed approach: apply PAT with unique transport mappings for concurrent sessions.

D:

Remove transport-port mapping from NAT entries and assume concurrent sessions remain distinguishable. PAT disambiguates flows by ports unlike one-to-one static NAT. This does not implement the needed approach: apply PAT with unique transport mappings for concurrent sessions.

Question 248

An Internet edge must present one public address for many private clients. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Observe the public egress address alone while ignoring each private client's translated source port
  2. Test one client connection rather than concurrent sessions with overlapping original ports
  3. Read NAT pool configuration but not active table occupancy and unique translations
  4. Observe NAT translations for distinct source ports under load

Explanation

Correct Answer

D:

PAT disambiguates flows by ports unlike one-to-one static NAT. The result of the remedy is checked directly: Observe NAT translations for distinct source ports under load.

Incorrect Answers

A:

Observe the public egress address alone while ignoring each private client's translated source port. PAT disambiguates flows by ports unlike one-to-one static NAT. The appropriate acceptance test is: Observe NAT translations for distinct source ports under load.

B:

Test one client connection rather than concurrent sessions with overlapping original ports. PAT disambiguates flows by ports unlike one-to-one static NAT. The appropriate acceptance test is: Observe NAT translations for distinct source ports under load.

C:

Read NAT pool configuration but not active table occupancy and unique translations. PAT disambiguates flows by ports unlike one-to-one static NAT. The appropriate acceptance test is: Observe NAT translations for distinct source ports under load.

Question 249

An on-premises server must retain a predictable public mapping. Which response MOST directly addresses the stated network problem or requirement?

  1. Apply explicit static NAT with a matching inbound firewall rule
  2. Use dynamic PAT only and expect a stable one-to-one inbound public address mapping
  3. Expose all private servers through broad permit-any inbound rules instead of a controlled static mapping
  4. Change DNS TTL while no matching translation or inbound firewall rule exists

Explanation

Correct Answer

A:

Translation alone does not grant firewall permission. A direct way to confirm the outcome is to verify both translation directions and unsolicited ingress policy.

Incorrect Answers

B:

Use dynamic PAT only and expect a stable one-to-one inbound public address mapping. Translation alone does not grant firewall permission. This does not implement the needed approach: apply explicit static NAT with a matching inbound firewall rule.

C:

Expose all private servers through broad permit-any inbound rules instead of a controlled static mapping. Translation alone does not grant firewall permission. This does not implement the needed approach: apply explicit static NAT with a matching inbound firewall rule.

D:

Change DNS TTL while no matching translation or inbound firewall rule exists. Translation alone does not grant firewall permission. This does not implement the needed approach: apply explicit static NAT with a matching inbound firewall rule.

Question 250

An on-premises server must retain a predictable public mapping. Which diagnostic or verification check MOST directly evaluates the expected network behavior in this situation?

  1. Verify outbound translation from the server but never attempt approved inbound access
  2. Verify both translation directions and unsolicited ingress policy
  3. Read the public IP assignment without checking destination NAT and policy counters
  4. Ping the Internet gateway and infer the published server's fixed mapping works

Explanation

Correct Answer

B:

Translation alone does not grant firewall permission. The result of the remedy is checked directly: Verify both translation directions and unsolicited ingress policy.

Incorrect Answers

A:

Verify outbound translation from the server but never attempt approved inbound access. Translation alone does not grant firewall permission. The appropriate acceptance test is: Verify both translation directions and unsolicited ingress policy.

C:

Read the public IP assignment without checking destination NAT and policy counters. Translation alone does not grant firewall permission. The appropriate acceptance test is: Verify both translation directions and unsolicited ingress policy.

D:

Ping the Internet gateway and infer the published server's fixed mapping works. Translation alone does not grant firewall permission. The appropriate acceptance test is: Verify both translation directions and unsolicited ingress policy.

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