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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

Cisco 300-410 Bundle $25.00
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Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) (300-410) Practice Tests

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Cisco 300-410 Practice Test 1

Question 1

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 operational change most directly addresses the fault described?

  1. Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops.
  2. Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability.
  3. Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.
  4. Adjust the prefix-list ge/le range to include precisely the permitted component masks.

Explanation

Correct Answer

A:

At the Redwood medical campus, the evidence points to a concrete mechanism rather than a generic outage. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric. Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops. Confirm it by checking that the installed route and its administrative-distance value match the approved eBGP-versus-OSPF preference.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: The static route has a lower default administrative distance and displaces the intended dynamic path. The stated evidence at the Redwood medical campus instead concerns routing-source administrative distance.

C:

This could help where route-map implicit deny is the issue, but not for the evidence reported at the Redwood medical campus. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

D:

That change targets prefix-list mask-length filtering, not the reported routing-source administrative distance fault at the Redwood medical campus. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

Question 2

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 operational change most directly addresses the fault described?

  1. Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops.
  2. Align OSPF authentication type, algorithm and matching credentials across the shared link.
  3. Evaluate OSPF path type precedence before comparing costs between intra-area and inter-area candidates.
  4. Set compatible OSPF network types appropriate to the actual transit medium on both ends.

Explanation

Correct Answer

A:

Compare the route sources by administrative distance and adjust the intended route preference only after confirming both next hops. That directly addresses the documented condition at the Cedarbrook hospital: The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric. Confirmation should show that the installed route and its administrative-distance value match the approved eBGP-versus-OSPF preference.

Incorrect Answers

B:

That change targets ospf authentication mismatch, not the reported routing-source administrative distance fault 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 appropriate for a different routing or network-control issue: OSPF prefers intra-area routes to inter-area routes for the same prefix even when cost figures differ. The stated evidence at the Cedarbrook hospital instead concerns routing-source administrative distance.

D:

This could help where ospf dr network-type mismatch is the issue, but not for the evidence reported at the Cedarbrook hospital. The routing table chooses between different routing sources by administrative distance before comparing a protocol's internal metric.

Question 3

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 operational change most directly addresses the fault described?

  1. Configure route-reflector-client relationships according to the iBGP topology design.
  2. Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability.
  3. Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.
  4. Configure the summary at the appropriate OSPF area border router for that source area.

Explanation

Correct Answer

B:

Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability. That directly addresses the documented condition at the Bayview university campus: The static route has a lower default administrative distance and displaces the intended dynamic path. Confirmation should show that the recovered dynamic route is installed, while the higher-distance static route becomes active only when the preferred path disappears.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: A normal iBGP speaker does not re-advertise routes learned from one iBGP peer to another. The stated evidence at the Bayview university campus instead concerns floating static backup route.

C:

That change targets route-map implicit deny, not the reported floating static backup route fault at the Bayview university campus. The static route has a lower default administrative distance and displaces the intended dynamic path.

D:

This is appropriate for a different routing or network-control issue: OSPF inter-area summary generation belongs to the ABR, not an arbitrary internal area router. The stated evidence at the Bayview university campus instead concerns floating static backup route.

Question 4

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 operational change most directly addresses the fault described?

  1. Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability.
  2. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.
  3. Use a consistent BGP local-preference policy within the AS to favor the required exit.
  4. Configure EIGRP variance within the feasible-path and feasible-distance limitations for unequal-cost load balancing.

Explanation

Correct Answer

A:

At the Clearwater library district, the evidence points to a concrete mechanism rather than a generic outage. The static route has a lower default administrative distance and displaces the intended dynamic path. Set the backup static route's administrative distance above the preferred dynamic route and verify next-hop reachability. Confirm it by checking that the recovered dynamic route is installed, while the higher-distance static route becomes active only when the preferred path disappears.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. The stated evidence at the Clearwater library district instead concerns floating static backup route.

C:

This could help where bgp local preference path policy is the issue, but not for the evidence reported at the Clearwater library district. The static route has a lower default administrative distance and displaces the intended dynamic path.

D:

That change targets eigrp variance traffic sharing, not the reported floating static backup route fault at the Clearwater library district. The static route has a lower default administrative distance and displaces the intended dynamic path.

Question 5

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 operational change most directly addresses the fault described?

  1. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection.
  2. Configure matching EIGRP autonomous-system values for the participating adjacency.
  3. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.
  4. Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.

Explanation

Correct Answer

D:

Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries. That directly addresses the documented condition at the Highland government office: A route map used for redistribution has an implicit deny when no permit entry matches the route. Confirmation should show that the intended branch prefix is advertised after matching the new permit sequence, without admitting unrelated routes.

Incorrect Answers

A:

This could help where bfd independent fast failure detection is the issue, but not for the evidence reported at the Highland government office. A route map used for redistribution has an implicit deny when no permit entry matches the route.

B:

That change targets eigrp as mismatch, not the reported route-map implicit deny fault 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 appropriate for a different routing or network-control issue: Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. The stated evidence at the Highland government office instead concerns route-map implicit deny.

Question 6

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 operational change most directly addresses the fault described?

  1. Set compatible OSPF network types appropriate to the actual transit medium on both ends.
  2. Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.
  3. Bind the route-map match statement to the correct prefix-list for the redistributed address family.
  4. Configure the two ends of the intended OSPF adjacency in the same area.

Explanation

Correct Answer

B:

Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries. That directly addresses the documented condition at the Foothill municipal site: A route map used for redistribution has an implicit deny when no permit entry matches the route. Confirmation should show that the intended branch prefix is advertised after matching the new permit sequence, without admitting unrelated routes.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: Different OSPF network-type expectations lead to inconsistent adjacency and DR behavior. The stated evidence at the Foothill municipal site instead concerns route-map implicit deny.

C:

That change targets route-map match direction in redistribution, not the reported route-map implicit deny fault 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 appropriate for a different routing or network-control issue: OSPF neighbor packets describe incompatible area membership for a common link. The stated evidence at the Foothill municipal site instead concerns route-map implicit deny.

Question 7

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 operational change most directly addresses the fault described?

  1. Set compatible OSPF network types appropriate to the actual transit medium on both ends.
  2. Configure appropriate EIGRP stub behavior on the leaf spoke and verify permitted route advertisements.
  3. Adjust the prefix-list ge/le range to include precisely the permitted component masks.
  4. Attach an inbound BGP prefix filter that explicitly permits the authorized customer set and rejects the rest.

Explanation

Correct Answer

C:

Adjust the prefix-list ge/le range to include precisely the permitted component masks. That directly addresses the documented condition at the Silverstream data center: An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them. Confirmation should show that the authorized /24 is accepted while unrelated longer and shorter prefixes remain filtered.

Incorrect Answers

A:

That change targets ospf dr network-type mismatch, not the reported prefix-list mask-length filtering fault 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 appropriate for a different routing or network-control issue: The leaf is participating in a query domain larger than its topology role requires. The stated evidence at the Silverstream data center instead concerns prefix-list mask-length filtering.

D:

That change targets bgp inbound prefix filtering, not the reported prefix-list mask-length filtering fault at the Silverstream data center. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

Question 8

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 operational change most directly addresses the fault described?

  1. Adjust the prefix-list ge/le range to include precisely the permitted component masks.
  2. Align the advertised summary with reachable component routes or provide a valid destination for every advertised component.
  3. Remove passive-interface status from the legitimate EIGRP transit port, keeping host-only interfaces passive.
  4. Evaluate the reported-distance-less-than-feasible-distance condition before treating a backup as feasible.

Explanation

Correct Answer

A:

Adjust the prefix-list ge/le range to include precisely the permitted component masks. That directly addresses the documented condition at the Brookstone distribution branch: An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them. Confirmation should show that the authorized /24 is accepted while unrelated longer and shorter prefixes remain filtered.

Incorrect Answers

B:

That change targets summary black hole from missing component, not the reported prefix-list mask-length filtering fault at the Brookstone distribution branch. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

C:

This is appropriate for a different routing or network-control issue: Passive-interface suppresses routing-neighbor discovery where an EIGRP adjacency is required. The stated evidence at the Brookstone distribution branch instead concerns prefix-list mask-length filtering.

D:

This could help where eigrp feasible successor inequality is the issue, but not for the evidence reported at the Brookstone distribution branch. An exact-mask prefix-list statement does not match longer component prefixes unless its length conditions allow them.

Question 9

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 operational change most directly addresses the fault described?

  1. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.
  2. Configure the summary at the appropriate OSPF area border router for that source area.
  3. Bind the route-map match statement to the correct prefix-list for the redistributed address family.
  4. Provide an explicit valid EIGRP seed metric for redistributed routes or configure an appropriate default metric.

Explanation

Correct Answer

A:

The fault at the Southridge banking office has a specific cause. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol. Confirm success against this result: Routes retain an origin tag and the return redistribution point rejects already-imported routes.

Incorrect Answers

B:

This could help where ospf area range configured on wrong border is the issue, but not for the evidence reported at the Southridge banking office. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

C:

That change targets route-map match direction in redistribution, not the reported redistribution loop route tagging fault at the Southridge banking office. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

D:

This is appropriate for a different routing or network-control issue: EIGRP needs a usable metric for routes introduced from a different source before they can be advertised. The stated evidence at the Southridge banking office instead concerns redistribution loop route tagging.

Question 10

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 operational change most directly addresses the fault described?

  1. Align the advertised summary with reachable component routes or provide a valid destination for every advertised component.
  2. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.
  3. Bind the route-map match statement to the correct prefix-list for the redistributed address family.
  4. Configure the summary at the appropriate OSPF area border router for that source area.

Explanation

Correct Answer

B:

The fault at the Lakeside transit hub has a specific cause. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol. Confirm success against this result: Routes retain an origin tag and the return redistribution point rejects already-imported routes.

Incorrect Answers

A:

That change targets summary black hole from missing component, not the reported redistribution loop route tagging fault at the Lakeside transit hub. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

C:

This could help where route-map match direction in redistribution is the issue, but not for the evidence reported at the Lakeside transit hub. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.

D:

That change targets ospf area range configured on wrong border, not the reported redistribution loop route tagging fault at the Lakeside transit hub. Mutual redistribution without route-origin controls allows a route to be injected back into its source domain.