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Cisco 300-410 Bundle

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 21

Question 200

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. Which operational change most directly addresses the fault described?

  1. Set the IP SLA operation's source interface or VRF context to the intended customer routing table.
  2. Use Cisco Catalyst Center Assurance to correlate client or device health with path and connectivity observations.
  3. Tie the preferred route to a suitable IP SLA object and tracking policy with a valid backup route.
  4. Use an IP SLA jitter operation appropriate to the traffic class rather than only binary reachability.

Explanation

Correct Answer

B:

At the Redwood medical campus, the evidence points to a concrete mechanism rather than a generic outage. Isolated interface statistics do not explain the combined endpoint, device and network symptoms. Use Cisco Catalyst Center Assurance to correlate client or device health with path and connectivity observations. Confirm it by checking that assurance telemetry identifies the affected clients, devices and relevant degradation window for targeted remediation.

Incorrect Answers

A:

This could help where ip sla source interface in vrf is the issue, but not for the evidence reported at the Redwood medical campus. Isolated interface statistics do not explain the combined endpoint, device and network symptoms.

C:

This is appropriate for a different routing or network-control issue: The router considers the directly reachable gateway healthy even though the desired remote path is unavailable. The stated evidence at the Redwood medical campus instead concerns catalyst center assurance path health.

D:

This could help where ip sla jitter versus simple ping is the issue, but not for the evidence reported at the Redwood medical campus. Isolated interface statistics do not explain the combined endpoint, device and network symptoms.

Question 201

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 underlying technical condition best accounts for this evidence?

  1. The static route has a lower default administrative distance and displaces the intended dynamic path.
  2. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.
  3. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.
  4. A route map used for redistribution has an implicit deny when no permit entry matches the route.

Explanation

Correct Answer

C:

The evidence at the Redwood medical campus supports this condition: The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric. The associated fix is: Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops.

Incorrect Answers

A:

This diagnoses a different mechanism: The static route has a lower default administrative distance and displaces the intended dynamic path. The reported symptom at the Redwood medical campus instead concerns routing-source administrative distance.

B:

That diagnosis belongs to prefix-list mask-length filtering, while the observation at the Redwood medical campus points to routing-source administrative distance.

D:

This diagnoses a different mechanism: A route map used for redistribution has an implicit deny when no permit entry matches the route. The reported symptom at the Redwood medical campus instead concerns routing-source administrative distance.

Question 202

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 underlying technical condition best accounts for this evidence?

  1. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.
  2. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.
  3. An aggregate advertisement masks loss of a more specific reachable route and attracts traffic to an unreachable subnet.
  4. The alternate path fails the strict EIGRP feasibility condition because 130 is not below 100.

Explanation

Correct Answer

A:

The evidence at the Cedarbrook hospital supports this condition: The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric. The associated fix is: Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops.

Incorrect Answers

B:

This diagnoses a different mechanism: VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. The reported symptom at the Cedarbrook hospital instead concerns routing-source administrative distance.

C:

That diagnosis belongs to summary black hole from missing component, while the observation at the Cedarbrook hospital points to routing-source administrative distance.

D:

The observation at the Cedarbrook hospital does not point to eigrp feasible successor inequality; it points to a different condition. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

Question 203

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 underlying technical condition best accounts for this evidence?

  1. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.
  2. The static route has a lower default administrative distance and displaces the intended dynamic path.
  3. An aggregate advertisement masks loss of a more specific reachable route and attracts traffic to an unreachable subnet.
  4. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

Explanation

Correct Answer

B:

The evidence at the Bayview university campus supports this condition: The static route has a lower default administrative distance and displaces the intended dynamic path. The associated fix is: Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability.

Incorrect Answers

A:

That diagnosis belongs to bfd independent fast failure detection, while the observation at the Bayview university campus points to floating static backup route.

C:

This diagnoses a different mechanism: An aggregate advertisement masks loss of a more specific reachable route and attracts traffic to an unreachable subnet. The reported symptom at the Bayview university campus instead concerns floating static backup route.

D:

That diagnosis belongs to prefix-list mask-length filtering, while the observation at the Bayview university campus points to floating static backup route.

Question 204

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 underlying technical condition best accounts for this evidence?

  1. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.
  2. The static route has a lower default administrative distance and displaces the intended dynamic path.
  3. The current inbound BGP policy fails to constrain accepted advertisements to contracted prefixes.
  4. OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Clearwater library district. The static route has a lower default administrative distance and displaces the intended dynamic path. The remedial action is: Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability.

Incorrect Answers

A:

This diagnoses a different mechanism: NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. The reported symptom at the Clearwater library district instead concerns floating static backup route.

C:

The observation at the Clearwater library district does not point to bgp inbound prefix filtering; it points to a different condition. The static route has a lower default administrative distance and displaces the intended dynamic path.

D:

This diagnoses a different mechanism: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. The reported symptom at the Clearwater library district instead concerns floating static backup route.

Question 205

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 underlying technical condition best accounts for this evidence?

  1. The redistribution policy tests an unrelated set of routes rather than the intended matching prefixes.
  2. A route map used for redistribution has an implicit deny when no permit entry matches the route.
  3. The EIGRP route metric reflects interface delay as well as bandwidth under standard metric settings.
  4. The iBGP-learned path retains a next hop that the receiving router cannot resolve.

Explanation

Correct Answer

B:

A route map used for redistribution has an implicit deny when no permit entry matches the route. That explains the specific symptom at the Highland government office. A direct corrective action is: Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.

Incorrect Answers

A:

The observation at the Highland government office does not point to route-map match direction in redistribution; it points to a different condition. A route map used for redistribution has an implicit deny when no permit entry matches the route.

C:

That diagnosis belongs to eigrp delay in composite metric, while the observation at the Highland government office points to route-map implicit deny.

D:

The observation at the Highland government office does not point to ibgp next-hop reachability; it points to a different condition. A route map used for redistribution has an implicit deny when no permit entry matches the route.

Question 206

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 underlying technical condition best accounts for this evidence?

  1. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.
  2. A normal iBGP speaker does not re-advertise routes learned from one iBGP peer to another.
  3. OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router.
  4. A route map used for redistribution has an implicit deny when no permit entry matches the route.

Explanation

Correct Answer

D:

This diagnosis fits the symptoms at the Foothill municipal site. A route map used for redistribution has an implicit deny when no permit entry matches the route. The remedial action is: Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.

Incorrect Answers

A:

That diagnosis belongs to ospf authentication mismatch, while the observation at the Foothill municipal site points to route-map implicit deny.

B:

The observation at the Foothill municipal site does not point to ibgp route reflection; it points to a different condition. A route map used for redistribution has an implicit deny when no permit entry matches the route.

C:

This diagnoses a different mechanism: OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router. The reported symptom at the Foothill municipal site instead concerns route-map implicit deny.

Question 207

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 underlying technical condition best accounts for this evidence?

  1. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.
  2. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.
  3. NSSA external routes use type-7 LSAs internally and depend on translation for normal areas.
  4. A virtual link cannot use a stub area as its transit area to repair backbone connectivity.

Explanation

Correct Answer

B:

This diagnosis fits the symptoms at the Silverstream data center. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them. The remedial action is: Adjust the prefix-list ge/le range to include precisely the permitted component masks.

Incorrect Answers

A:

This diagnoses a different mechanism: VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. The reported symptom at the Silverstream data center instead concerns prefix-list mask-length filtering.

C:

The observation at the Silverstream data center does not point to ospf nssa external routes; it points to a different condition. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

D:

This diagnoses a different mechanism: A virtual link cannot use a stub area as its transit area to repair backbone connectivity. The reported symptom at the Silverstream data center instead concerns prefix-list mask-length filtering.

Question 208

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 underlying technical condition best accounts for this evidence?

  1. Authentication settings on the OSPF peers no longer match, so received protocol packets are rejected.
  2. OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router.
  3. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.
  4. A normal iBGP speaker does not re-advertise routes learned from one iBGP peer to another.

Explanation

Correct Answer

C:

This diagnosis fits the symptoms at the Brookstone distribution branch. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them. The remedial action is: Adjust the prefix-list ge/le range to include precisely the permitted component masks.

Incorrect Answers

A:

The observation at the Brookstone distribution branch does not point to ospf authentication mismatch; it points to a different condition. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

B:

This diagnoses a different mechanism: OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router. The reported symptom at the Brookstone distribution branch instead concerns prefix-list mask-length filtering.

D:

The observation at the Brookstone distribution branch does not point to ibgp route reflection; it points to a different condition. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

Question 209

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 underlying technical condition best accounts for this evidence?

  1. An aggregate advertisement masks loss of a more specific reachable route and attracts traffic to an unreachable subnet.
  2. The redistribution policy tests an unrelated set of routes rather than the intended matching prefixes.
  3. OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router.
  4. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

Explanation

Correct Answer

D:

This diagnosis fits the symptoms at the Southridge banking office. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. The remedial action is: Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.

Incorrect Answers

A:

That diagnosis belongs to summary black hole from missing component, while the observation at the Southridge banking office points to redistribution loop route tagging.

B:

The observation at the Southridge banking office does not point to route-map match direction in redistribution; it points to a different condition. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

C:

This diagnoses a different mechanism: OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router. The reported symptom at the Southridge banking office instead concerns redistribution loop route tagging.

Question 210

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 underlying technical condition best accounts for this evidence?

  1. OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router.
  2. EIGRP needs a usable metric for routes introduced from a different source before they can be advertised.
  3. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.
  4. The redistribution policy tests an unrelated set of routes rather than the intended matching prefixes.

Explanation

Correct Answer

C:

The evidence at the Lakeside transit hub supports this condition: Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. The associated fix is: Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.

Incorrect Answers

A:

This diagnoses a different mechanism: OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router. The reported symptom at the Lakeside transit hub instead concerns redistribution loop route tagging.

B:

That diagnosis belongs to seed metric on eigrp redistribution, while the observation at the Lakeside transit hub points to redistribution loop route tagging.

D:

This diagnoses a different mechanism: The redistribution policy tests an unrelated set of routes rather than the intended matching prefixes. The reported symptom at the Lakeside transit hub instead concerns redistribution loop route tagging.