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

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Cisco 300-410 Practice Test 3

Question 20

At the Elmfield engineering office, R-ELM-EDGE1 has a correct PBR route map, but client traffic entering the LAN interface still follows the normal routing table toward the Midtown engineering center. Which operational change most directly addresses the fault described?

  1. Apply the PBR route map to the correct incoming interface with the appropriate policy command.
  2. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection.
  3. Use verified next-hop availability or tracking so the PBR action does not force traffic to an unreachable gateway.
  4. Associate the partner interface with the correct VRF and restore its address configuration as required.

Explanation

Correct Answer

A:

Apply the PBR route map to the correct incoming interface with the appropriate policy command. That directly addresses the documented condition at the Elmfield engineering office: The policy is defined but not applied on the interface where the targeted packets enter. Confirmation should show that matching packets use the policy-selected next hop while nonmatching traffic keeps normal forwarding.

Incorrect Answers

B:

That change targets bfd independent fast failure detection, not the reported policy-based routing ingress application fault at the Elmfield engineering office. The policy is defined but not applied on the interface where the targeted packets enter.

C:

This is appropriate for a different routing or network-control issue: A static policy next hop is being used without confirming that forwarding through it is possible. The stated evidence at the Elmfield engineering office instead concerns policy-based routing ingress application.

D:

This could help where vrf-lite interface assignment is the issue, but not for the evidence reported at the Elmfield engineering office. The policy is defined but not applied on the interface where the targeted packets enter.

Question 21

At the Oakbridge insurance office, a PBR rule directs selected application flows to a backup gateway that has failed, even though the normal destination route remains usable. Which operational change most directly addresses the fault described?

  1. Associate the partner interface with the correct VRF and restore its address configuration as required.
  2. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection.
  3. Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs.
  4. Use verified next-hop availability or tracking so the PBR action does not force traffic to an unreachable gateway.

Explanation

Correct Answer

D:

The fault at the Oakbridge insurance office has a specific cause. A static policy next hop is being used without confirming that forwarding through it is possible. Use verified next-hop availability or tracking so the PBR action does not force traffic to an unreachable gateway. Confirm success against this result: Policy-matched traffic falls back or changes next hop when the specified gateway becomes unavailable.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: The interface was not placed in the customer VRF, so routing separation is ineffective for that link. The stated evidence at the Oakbridge insurance office instead concerns pbr next-hop reachability.

B:

This could help where bfd independent fast failure detection is the issue, but not for the evidence reported at the Oakbridge insurance office. A static policy next hop is being used without confirming that forwarding through it is possible.

C:

That change targets vrf route leaking, not the reported pbr next-hop reachability fault at the Oakbridge insurance office. A static policy next hop is being used without confirming that forwarding through it is possible.

Question 22

At the Aspen agricultural office, a PBR rule directs selected application flows to a backup gateway that has failed, even though the normal destination route remains usable. 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. Apply the PBR route map to the correct incoming interface with the appropriate policy command.
  3. Use verified next-hop availability or tracking so the PBR action does not force traffic to an unreachable gateway.
  4. Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs.

Explanation

Correct Answer

C:

Use verified next-hop availability or tracking so the PBR action does not force traffic to an unreachable gateway. That directly addresses the documented condition at the Aspen agricultural office: A static policy next hop is being used without confirming that forwarding through it is possible. Confirmation should show that policy-matched traffic falls back or changes next hop when the specified gateway becomes unavailable.

Incorrect Answers

A:

That change targets bfd independent fast failure detection, not the reported pbr next-hop reachability fault at the Aspen agricultural office. A static policy next hop is being used without confirming that forwarding through it is possible.

B:

This is appropriate for a different routing or network-control issue: The policy is defined but not applied on the interface where the targeted packets enter. The stated evidence at the Aspen agricultural office instead concerns pbr next-hop reachability.

D:

That change targets vrf route leaking, not the reported pbr next-hop reachability fault at the Aspen agricultural office. A static policy next hop is being used without confirming that forwarding through it is possible.

Question 23

At the Cedarbrook hospital, a partner-facing interface carries 10.138.0.0/16, but lookup on R-CDR-WAN1 uses the global table instead of the intended customer VRF. Which operational change most directly addresses the fault described?

  1. Associate the partner interface with the correct VRF and restore its address configuration as required.
  2. Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs.
  3. Apply the PBR route map to the correct incoming interface with the appropriate policy command.
  4. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection.

Explanation

Correct Answer

A:

Associate the partner interface with the correct VRF and restore its address configuration as required. That directly addresses the documented condition at the Cedarbrook hospital: The interface was not placed in the customer VRF, so routing separation is ineffective for that link. Confirmation should show that a VRF-specific route lookup shows the connected network under the correct VRF, not only in global routing.

Incorrect Answers

B:

That change targets vrf route leaking, not the reported vrf-lite interface assignment fault at the Cedarbrook hospital. The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

C:

This is appropriate for a different routing or network-control issue: The policy is defined but not applied on the interface where the targeted packets enter. The stated evidence at the Cedarbrook hospital instead concerns vrf-lite interface assignment.

D:

This could help where bfd independent fast failure detection is the issue, but not for the evidence reported at the Cedarbrook hospital. The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

Question 24

At the Redwood medical campus, a partner-facing interface carries 10.21.0.0/16, but lookup on R-RED-EDGE1 uses the global table instead of the intended customer VRF. Which operational change most directly addresses the fault described?

  1. Verify NSSA type-7 origination and the ABR translation behavior for the external prefix.
  2. Associate the partner interface with the correct VRF and restore its address configuration as required.
  3. Make OSPF stub-area attributes consistent for the peers sharing the area.
  4. Configure route-reflector-client relationships according to the iBGP topology design.

Explanation

Correct Answer

B:

Associate the partner interface with the correct VRF and restore its address configuration as required. That directly addresses the documented condition at the Redwood medical campus: The interface was not placed in the customer VRF, so routing separation is ineffective for that link. Confirmation should show that a VRF-specific route lookup shows the connected network under the correct VRF, not only in global routing.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: NSSA external routes use type-7 LSAs internally and depend on translation for normal areas. The stated evidence at the Redwood medical campus instead concerns vrf-lite interface assignment.

C:

That change targets ospf stub area options mismatch, not the reported vrf-lite interface assignment fault at the Redwood medical campus. The interface was not placed in the customer VRF, so routing separation is ineffective for that link.

D:

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 Redwood medical campus instead concerns vrf-lite interface assignment.

Question 25

At the Clearwater library district, two isolated VRFs on R-CLW-EDGE1 need access to one shared service at the West archives campus; routes exist in each VRF, but neither can reach the shared destination. Which operational change most directly addresses the fault described?

  1. Evaluate OSPF path type precedence before comparing costs between intra-area and inter-area candidates.
  2. Rework the backbone connection or place the OSPF virtual link over an eligible non-stub transit area.
  3. Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs.
  4. Use a consistent BGP local-preference policy within the AS to favor the required exit.

Explanation

Correct Answer

C:

Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs. That directly addresses the documented condition at the Clearwater library district: VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. Confirmation should show that only the authorized shared-service prefixes appear and work across the VRF boundary.

Incorrect Answers

A:

That change targets ospf intra-area route preference, not the reported vrf route leaking fault at the Clearwater library district. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

B:

This is appropriate for a different routing or network-control issue: A virtual link cannot use a stub area as its transit area to repair backbone connectivity. The stated evidence at the Clearwater library district instead concerns vrf route leaking.

D:

That change targets bgp local preference path policy, not the reported vrf route leaking fault at the Clearwater library district. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

Question 26

At the Bayview university campus, two isolated VRFs on R-BAY-DIST1 need access to one shared service at the Albany research network; routes exist in each VRF, but neither can reach the shared destination. Which operational change most directly addresses the fault described?

  1. Configure eBGP multihop and reliable loopback reachability for the non-direct peer as appropriate.
  2. Apply the PBR route map to the correct incoming interface with the appropriate policy command.
  3. Correct the interface MTU mismatch rather than bypassing the OSPF database-description check.
  4. Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs.

Explanation

Correct Answer

D:

Implement narrowly scoped inter-VRF route exchange using supported route leaking or explicit routing between VRFs. That directly addresses the documented condition at the Bayview university campus: VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange. Confirmation should show that only the authorized shared-service prefixes appear and work across the VRF boundary.

Incorrect Answers

A:

This could help where ebgp non-direct neighbor multihop is the issue, but not for the evidence reported at the Bayview university campus. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

B:

That change targets policy-based routing ingress application, not the reported vrf route leaking fault at the Bayview university campus. VRF-Lite intentionally isolates routing tables, and sharing needs a configured route exchange.

C:

This is appropriate for a different routing or network-control issue: Incompatible interface MTU values can prevent successful OSPF database-description exchange. The stated evidence at the Bayview university campus instead concerns vrf route leaking.

Question 27

At the Foothill municipal site, R-FOO-DIST1 keeps an IGP neighbor for many seconds after the point-to-point transport toward the North service operations center stops forwarding data. Which operational change most directly addresses the fault described?

  1. Configure the summary at the appropriate OSPF area border router for that source area.
  2. Bind the route-map match statement to the correct prefix-list for the redistributed address family.
  3. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection.
  4. Tag redistributed routes at entry and filter those tags from re-entering their origin protocol.

Explanation

Correct Answer

C:

At the Foothill municipal site, the evidence points to a concrete mechanism rather than a generic outage. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection. Confirm it by checking that the BFD session transitions down promptly on a simulated forwarding failure and the routing neighbor reacts.

Incorrect Answers

A:

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 Foothill municipal site instead concerns bfd independent fast failure detection.

B:

This could help where route-map match direction in redistribution is the issue, but not for the evidence reported at the Foothill municipal site. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

D:

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 Foothill municipal site instead concerns bfd independent fast failure detection.

Question 28

At the Highland government office, R-HIG-RT1 keeps an IGP neighbor for many seconds after the point-to-point transport toward the Capital public records site stops forwarding data. 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. Rework the backbone connection or place the OSPF virtual link over an eligible non-stub transit area.
  3. Correct the interface MTU mismatch rather than bypassing the OSPF database-description check.
  4. Add a narrowly scoped permit sequence for the intended prefix after the restrictive route-map entries.

Explanation

Correct Answer

A:

At the Highland government office, the evidence points to a concrete mechanism rather than a generic outage. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure. Enable and tune supported BFD sessions on the routing adjacencies that need rapid forwarding failure detection. Confirm it by checking that the BFD session transitions down promptly on a simulated forwarding failure and the routing neighbor reacts.

Incorrect Answers

B:

This is appropriate for a different routing or network-control issue: A virtual link cannot use a stub area as its transit area to repair backbone connectivity. The stated evidence at the Highland government office instead concerns bfd independent fast failure detection.

C:

This could help where ospf mtu exstart is the issue, but not for the evidence reported at the Highland government office. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

D:

That change targets route-map implicit deny, not the reported bfd independent fast failure detection fault at the Highland government office. IGP hello/dead timers alone are too slow to detect the observed forwarding-path failure.

Question 29

At the Brookstone distribution branch, EIGRP hellos pass across the transit link, yet R-BRK-EDGE1 never forms a neighbor with R-NEW-EDGE2; the peers use different EIGRP AS numbers. Which operational change most directly addresses the fault described?

  1. Evaluate the reported-distance-less-than-feasible-distance condition before treating a backup as feasible.
  2. Remove passive-interface status from the legitimate EIGRP transit port, keeping host-only interfaces passive.
  3. Configure matching EIGRP autonomous-system values for the participating adjacency.
  4. Configure EIGRP variance within the feasible-path and feasible-distance limitations for unequal-cost load balancing.

Explanation

Correct Answer

C:

The fault at the Brookstone distribution branch has a specific cause. EIGRP peers in different AS configurations will not establish the intended neighbor relationship. Configure matching EIGRP autonomous-system values for the participating adjacency. Confirm success against this result: The correct EIGRP neighbor appears and the expected routes are learned.

Incorrect Answers

A:

This could help where eigrp feasible successor inequality is the issue, but not for the evidence reported at the Brookstone distribution branch. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

B:

That change targets eigrp passive-interface adjacency, not the reported eigrp as mismatch fault at the Brookstone distribution branch. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

D:

This could help where eigrp variance traffic sharing is the issue, but not for the evidence reported at the Brookstone distribution branch. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

Question 30

At the Silverstream data center, EIGRP hellos pass across the transit link, yet R-SIL-PE1 never forms a neighbor with R-RIV-PE2; the peers use different EIGRP AS numbers. Which operational change most directly addresses the fault described?

  1. Evaluate the reported-distance-less-than-feasible-distance condition before treating a backup as feasible.
  2. Make the EIGRP authentication mode and key configuration consistent on both ends.
  3. Remove passive-interface status from the legitimate EIGRP transit port, keeping host-only interfaces passive.
  4. Configure matching EIGRP autonomous-system values for the participating adjacency.

Explanation

Correct Answer

D:

The fault at the Silverstream data center has a specific cause. EIGRP peers in different AS configurations will not establish the intended neighbor relationship. Configure matching EIGRP autonomous-system values for the participating adjacency. Confirm success against this result: The correct EIGRP neighbor appears and the expected routes are learned.

Incorrect Answers

A:

This is appropriate for a different routing or network-control issue: The alternate path fails the strict EIGRP feasibility condition because 130 is not below 100. The stated evidence at the Silverstream data center instead concerns eigrp as mismatch.

B:

This could help where eigrp authentication mismatch is the issue, but not for the evidence reported at the Silverstream data center. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.

C:

That change targets eigrp passive-interface adjacency, not the reported eigrp as mismatch fault at the Silverstream data center. EIGRP peers in different AS configurations will not establish the intended neighbor relationship.