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Exam Code: 300-410

Exam Name Implementing Cisco Enterprise Advanced Routing and Services (ENARSI)

Certification Provider: Cisco

Corresponding Certification: CCNP Enterprise

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Cisco 300-410 Practice Test 61

Question 600

At the Redwood medical campus, users report unstable application connectivity and operations needs a correlated view of endpoint experience, device health and network path status instead of raw interface counters alone. After remediation, which observation would most directly demonstrate the intended result?

  1. The VRF-scoped probe reaches the target and its measurements reflect the customer path.
  2. The collector decodes the intended IPFIX or v9 records with correct fields and timestamps.
  3. Assurance telemetry identifies the affected clients, devices and relevant degradation window for targeted remediation.
  4. The monitor cache collects flow records and the configured collector receives exported data.

Explanation

Correct Answer

C:

The stated result demonstrates that the specific condition at the Redwood medical campus has been corrected. Assurance telemetry identifies the affected clients, devices and relevant degradation window for targeted remediation.

Incorrect Answers

A:

This validates an unrelated control at the Redwood medical campus: The VRF-scoped probe reaches the target and its measurements reflect the customer path. It would not demonstrate correction of catalyst center assurance path health.

B:

That test could pass while the specific fault remains. The collector decodes the intended IPFIX or v9 records with correct fields and timestamps. It would not establish the required outcome for catalyst center assurance path health at the Redwood medical campus.

D:

This validates an unrelated control at the Redwood medical campus: The monitor cache collects flow records and the configured collector receives exported data. It would not demonstrate correction of catalyst center assurance path health.

Question 601

At the Redwood medical campus, R-RED-EDGE1 learns the same 10.21.0.0/16 prefix through eBGP and OSPF; the eBGP next hop is reachable, but engineers assumed OSPF's lower metric would win. Which continuing operational control is most directly relevant to preventing this problem?

  1. Run before-and-after route-policy tests with permitted and denied prefix lengths.
  2. Review route-map hit counts and explicit final permits after policy edits.
  3. Test both primary recovery and failure against the intended routing-source preferences.
  4. Monitor which routing source owns the critical prefix after peering or preference changes.

Explanation

Correct Answer

D:

The safeguard follows the failure mechanism at the Redwood medical campus. Monitor which routing source owns the critical prefix after peering or preference changes.

Incorrect Answers

A:

That safeguard protects against prefix-list mask-length filtering, not the concrete risk described at the Redwood medical campus. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

B:

This is useful for another concern: Review route-map hit counts and explicit final permits after policy edits. It does not continuously test routing-source administrative distance at the Redwood medical campus.

C:

This would manage a different failure pattern. The static route has a lower default administrative distance and displaces the intended dynamic path. It is not the most direct recurring check for routing-source administrative distance at the Redwood medical campus.

Question 602

At the Cedarbrook hospital, R-CDR-WAN1 learns the same 10.138.0.0/16 prefix through eBGP and OSPF; the eBGP next hop is reachable, but engineers assumed OSPF's lower metric would win. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor which routing source owns the critical prefix after peering or preference changes.
  2. Inspect redistribution metric settings and advertised routes after protocol integration.
  3. Validate ABR ownership and summary advertisements whenever area boundaries change.
  4. Monitor the recursive peer reachability and eBGP multihop settings after path changes.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Cedarbrook hospital. Monitor which routing source owns the critical prefix after peering or preference changes. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against seed metric on eigrp redistribution, not the concrete risk described at the Cedarbrook hospital. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

C:

This is useful for another concern: Validate ABR ownership and summary advertisements whenever area boundaries change. It does not continuously test routing-source administrative distance at the Cedarbrook hospital.

D:

This would manage a different failure pattern. The default eBGP directly connected peer assumptions do not support this multiple-hop session. It is not the most direct recurring check for routing-source administrative distance at the Cedarbrook hospital.

Question 603

At the Bayview university campus, a static route meant to be a standby path remains installed instead of the dynamic route over the recovered primary link to the Albany research network. Which continuing operational control is most directly relevant to preventing this problem?

  1. Audit route leaks against the tenant isolation policy and permitted shared prefixes.
  2. Test both primary recovery and failure against the intended routing-source preferences.
  3. Validate common transit MTUs before routing maintenance windows.
  4. Watch component reachability and aggregate advertisement together during topology changes.

Explanation

Correct Answer

B:

This control monitors the relevant configuration or operational behavior at the Bayview university campus. Test both primary recovery and failure against the intended routing-source preferences. It targets the condition described in the stem.

Incorrect Answers

A:

This is useful for another concern: Audit route leaks against the tenant isolation policy and permitted shared prefixes. It does not continuously test floating static backup route at the Bayview university campus.

C:

That safeguard protects against ospf mtu exstart, not the concrete risk described at the Bayview university campus. The static route has a lower default administrative distance and displaces the intended dynamic path.

D:

This is useful for another concern: Watch component reachability and aggregate advertisement together during topology changes. It does not continuously test floating static backup route at the Bayview university campus.

Question 604

At the Clearwater library district, a static route meant to be a standby path remains installed instead of the dynamic route over the recovered primary link to the West archives campus. Which continuing operational control is most directly relevant to preventing this problem?

  1. Validate next-hop reachability when advertising external routes to internal BGP peers.
  2. Monitor which routing source owns the critical prefix after peering or preference changes.
  3. Test both primary recovery and failure against the intended routing-source preferences.
  4. Check learned OSPF route types, not merely metric values, when investigating path choice.

Explanation

Correct Answer

C:

This control monitors the relevant configuration or operational behavior at the Clearwater library district. Test both primary recovery and failure against the intended routing-source preferences. It targets the condition described in the stem.

Incorrect Answers

A:

That safeguard protects against ibgp next-hop reachability, not the concrete risk described at the Clearwater library district. The static route has a lower default administrative distance and displaces the intended dynamic path.

B:

This is useful for another concern: Monitor which routing source owns the critical prefix after peering or preference changes. It does not continuously test floating static backup route at the Clearwater library district.

D:

That safeguard protects against ospf intra-area route preference, not the concrete risk described at the Clearwater library district. The static route has a lower default administrative distance and displaces the intended dynamic path.

Question 605

At the Highland government office, R-HIG-RT1 redistributes selected branch prefixes with a route map, but an otherwise valid 10.83.0.0/16 route is omitted after the last deny clause. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review route-map hit counts and explicit final permits after policy edits.
  2. Run before-and-after route-policy tests with permitted and denied prefix lengths.
  3. Monitor accepted-prefix counts and prefix-filter changes per eBGP peer.
  4. Audit reflector client roles and BGP propagation after adding branches.

Explanation

Correct Answer

A:

This control monitors the relevant configuration or operational behavior at the Highland government office. Review route-map hit counts and explicit final permits after policy edits. It targets the condition described in the stem.

Incorrect Answers

B:

That safeguard protects against prefix-list mask-length filtering, not the concrete risk described at the Highland government office. A route map used for redistribution has an implicit deny when no permit entry matches the route.

C:

This is useful for another concern: Monitor accepted-prefix counts and prefix-filter changes per eBGP peer. It does not continuously test route-map implicit deny at the Highland government office.

D:

This would manage a different failure pattern. A normal iBGP speaker does not re-advertise routes learned from one iBGP peer to another. It is not the most direct recurring check for route-map implicit deny at the Highland government office.

Question 606

At the Foothill municipal site, R-FOO-DIST1 redistributes selected branch prefixes with a route map, but an otherwise valid 10.204.0.0/16 route is omitted after the last deny clause. Which continuing operational control is most directly relevant to preventing this problem?

  1. Audit reflector client roles and BGP propagation after adding branches.
  2. Review route-map hit counts and explicit final permits after policy edits.
  3. Compare AS identifiers across both ends during adjacency provisioning.
  4. Distinguish router-local weight changes from propagated BGP attributes in policy reviews.

Explanation

Correct Answer

B:

This control monitors the relevant configuration or operational behavior at the Foothill municipal site. Review route-map hit counts and explicit final permits after policy edits. It targets the condition described in the stem.

Incorrect Answers

A:

This is useful for another concern: Audit reflector client roles and BGP propagation after adding branches. It does not continuously test route-map implicit deny at the Foothill municipal site.

C:

That safeguard protects against eigrp as mismatch, not the concrete risk described at the Foothill municipal site. A route map used for redistribution has an implicit deny when no permit entry matches the route.

D:

This is useful for another concern: Distinguish router-local weight changes from propagated BGP attributes in policy reviews. It does not continuously test route-map implicit deny at the Foothill municipal site.

Question 607

At the Silverstream data center, R-SIL-PE1 receives a desired /24 component of an aggregate, but a prefix-list rule allowing only the aggregate's exact mask rejects it. Which continuing operational control is most directly relevant to preventing this problem?

  1. Monitor accepted-prefix counts and prefix-filter changes per eBGP peer.
  2. Control and document EIGRP delay values instead of using them as untracked tuning knobs.
  3. Validate next-hop reachability when advertising external routes to internal BGP peers.
  4. Run before-and-after route-policy tests with permitted and denied prefix lengths.

Explanation

Correct Answer

D:

The safeguard follows the failure mechanism at the Silverstream data center. Run before-and-after route-policy tests with permitted and denied prefix lengths.

Incorrect Answers

A:

That safeguard protects against bgp inbound prefix filtering, not the concrete risk described at the Silverstream data center. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

B:

This is useful for another concern: Control and document EIGRP delay values instead of using them as untracked tuning knobs. It does not continuously test prefix-list mask-length filtering at the Silverstream data center.

C:

This would manage a different failure pattern. The iBGP-learned path retains a next hop that the receiving router cannot resolve. It is not the most direct recurring check for prefix-list mask-length filtering at the Silverstream data center.

Question 608

At the Brookstone distribution branch, R-BRK-EDGE1 receives a desired /24 component of an aggregate, but a prefix-list rule allowing only the aggregate's exact mask rejects it. Which continuing operational control is most directly relevant to preventing this problem?

  1. Review stub declarations and query boundaries as spoke sites are added.
  2. Run before-and-after route-policy tests with permitted and denied prefix lengths.
  3. Audit route-tag filters and redistributed routes whenever interdomain borders change.
  4. Distinguish router-local weight changes from propagated BGP attributes in policy reviews.

Explanation

Correct Answer

B:

The safeguard follows the failure mechanism at the Brookstone distribution branch. Run before-and-after route-policy tests with permitted and denied prefix lengths.

Incorrect Answers

A:

This would manage a different failure pattern. The leaf is participating in a query domain larger than its topology role requires. It is not the most direct recurring check for prefix-list mask-length filtering at the Brookstone distribution branch.

C:

This is useful for another concern: Audit route-tag filters and redistributed routes whenever interdomain borders change. It does not continuously test prefix-list mask-length filtering at the Brookstone distribution branch.

D:

This would manage a different failure pattern. Cisco BGP weight affects path selection only on the local router and is not propagated to peers. It is not the most direct recurring check for prefix-list mask-length filtering at the Brookstone distribution branch.

Question 609

At the Southridge banking office, OSPF routes enter EIGRP through R-SRG-EDGE1 and are later returned to OSPF at the Main processing center, producing unstable preferred paths to 10.149.0.0/16. Which continuing operational control is most directly relevant to preventing this problem?

  1. Inspect redistribution metric settings and advertised routes after protocol integration.
  2. Use test prefixes to verify policy matches before changing production redistribution.
  3. Validate ABR ownership and summary advertisements whenever area boundaries change.
  4. Audit route-tag filters and redistributed routes whenever interdomain borders change.

Explanation

Correct Answer

D:

At the Southridge banking office, this continuing check directly limits recurrence of the observed failure. Audit route-tag filters and redistributed routes whenever interdomain borders change. The underlying problem is: Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

Incorrect Answers

A:

This is useful for another concern: Inspect redistribution metric settings and advertised routes after protocol integration. It does not continuously test redistribution loop route tagging at the Southridge banking office.

B:

This would manage a different failure pattern. The redistribution policy tests an unrelated set of routes rather than the intended matching prefixes. It is not the most direct recurring check for redistribution loop route tagging at the Southridge banking office.

C:

That safeguard protects against ospf area range configured on wrong border, not the concrete risk described at the Southridge banking office. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

Question 610

At the Lakeside transit hub, OSPF routes enter EIGRP through R-LAK-CORE1 and are later returned to OSPF at the East depot network, producing unstable preferred paths to 10.32.0.0/16. Which continuing operational control is most directly relevant to preventing this problem?

  1. Watch component reachability and aggregate advertisement together during topology changes.
  2. Validate ABR ownership and summary advertisements whenever area boundaries change.
  3. Audit route-tag filters and redistributed routes whenever interdomain borders change.
  4. Inspect redistribution metric settings and advertised routes after protocol integration.

Explanation

Correct Answer

C:

This control monitors the relevant configuration or operational behavior at the Lakeside transit hub. Audit route-tag filters and redistributed routes whenever interdomain borders change. It targets the condition described in the stem.

Incorrect Answers

A:

That safeguard protects against summary black hole from missing component, not the concrete risk described at the Lakeside transit hub. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

B:

This is useful for another concern: Validate ABR ownership and summary advertisements whenever area boundaries change. It does not continuously test redistribution loop route tagging at the Lakeside transit hub.

D:

That safeguard protects against seed metric on eigrp redistribution, not the concrete risk described at the Lakeside transit hub. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.