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Exam Code: 350-401
Exam Name: Implementing Cisco Enterprise Network Core Technologies (ENCOR)
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Implementing Cisco Enterprise Network Core Technologies (ENCOR) 350-401 Practice Test 18

Question 170

The change request says: verify exact `vrf forwarding` membership on every L3 interface. Which verification result is most decisive?

  1. Path MTU testing succeeds with payload sizes below the protected tunnel limit.
  2. Per-VRF route and tunnel checks isolate each tenant's forwarding path.
  3. The destination is found in the selected VRF routing table.
  4. `show vrf interface` lists each interface under its intended tenant VRF.

Explanation

Correct Answer

D:

`show vrf interface` lists each interface under its intended tenant VRF. This is the targeted operational evidence for the change. Physical interface reuse does not guarantee correct tenant routing-context assignment. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Account for GRE/IPsec header overhead using suitable MTU and MSS adjustment. Encapsulation reduces usable payload size and can drop fragmented/DF packets. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Run tunnel endpoints and their static or dynamic routes in the intended VRFs. Tenant-specific overlay routes should remain in their corresponding routing context. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Place or selectively leak the route into the proper VRF. Route lookup follows the interface's VRF unless route leaking is configured. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 171

A tunnel interface line protocol is up while all user sessions fail due to MTU. What is the most effective configuration or design response?

  1. Apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust.
  2. Create separate VRF routing instances with dedicated interfaces.
  3. Account for GRE/IPsec header overhead using suitable MTU and MSS adjustment.
  4. Reapply the interface IP after binding it to the VRF where required.

Explanation

Correct Answer

C:

Encapsulation reduces usable payload size and can drop fragmented/DF packets. The most direct remediation is account for GRE/IPsec header overhead using suitable MTU and MSS adjustment. A practical acceptance test is path MTU testing succeeds with payload sizes below the protected tunnel limit. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An engineer tries to use GRE as an access-control boundary by itself. Encapsulation is not an authorization or confidentiality mechanism. It does not specifically correct the issue here: a tunnel interface line protocol is up while all user sessions fail due to MTU.

B:

This choice addresses a different situation: Two customers use the same 10.10.0.0/16 prefixes on one router. VRF separation gives each tenant an independent routing table. It does not specifically correct the issue here: a tunnel interface line protocol is up while all user sessions fail due to MTU.

D:

This choice addresses a different situation: An engineer configures `ip vrf forwarding` and the interface loses its IPv4 address. Some IOS VRF-binding operations clear existing L3 interface addresses. It does not specifically correct the issue here: a tunnel interface line protocol is up while all user sessions fail due to MTU.

Question 172

A post-change test follows this action: account for GRE/IPsec header overhead using suitable MTU and MSS adjustment. Which result demonstrates success?

  1. Only explicitly permitted sources can inject protected tunnel traffic.
  2. Path MTU testing succeeds with payload sizes below the protected tunnel limit.
  3. `show ip route vrf` presents distinct routes for the overlapping prefix.
  4. `show ip interface brief vrf` shows the correctly restored address.

Explanation

Correct Answer

B:

Path MTU testing succeeds with payload sizes below the protected tunnel limit. This is the targeted operational evidence for the change. Encapsulation reduces usable payload size and can drop fragmented/DF packets. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust. Encapsulation is not an authorization or confidentiality mechanism. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Create separate VRF routing instances with dedicated interfaces. VRF separation gives each tenant an independent routing table. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Reapply the interface IP after binding it to the VRF where required. Some IOS VRF-binding operations clear existing L3 interface addresses. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 173

An engineer tries to use GRE as an access-control boundary by itself. Which change should the network engineer prioritize?

  1. Apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust.
  2. Run tunnel endpoints and their static or dynamic routes in the intended VRFs.
  3. Place or selectively leak the route into the proper VRF.
  4. Use explicit controlled VRF route leaking rather than merging VRFs.

Explanation

Correct Answer

A:

Encapsulation is not an authorization or confidentiality mechanism. The most direct remediation is apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust. A practical acceptance test is only explicitly permitted sources can inject protected tunnel traffic. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: One router carries many tenant tunnels and routing outputs are difficult to read. Tenant-specific overlay routes should remain in their corresponding routing context. It does not specifically correct the issue here: an engineer tries to use GRE as an access-control boundary by itself.

C:

This choice addresses a different situation: A VRF-bound interface cannot route through a route in the global table. Route lookup follows the interface's VRF unless route leaking is configured. It does not specifically correct the issue here: an engineer tries to use GRE as an access-control boundary by itself.

D:

This choice addresses a different situation: A customer VRF needs to exchange routes with a security-services VRF. Selective route exchange preserves separation while allowing sanctioned paths. It does not specifically correct the issue here: an engineer tries to use GRE as an access-control boundary by itself.

Question 174

During acceptance testing after apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust., which evidence is most relevant?

  1. Per-VRF route and tunnel checks isolate each tenant's forwarding path.
  2. The destination is found in the selected VRF routing table.
  3. Only whitelisted service prefixes appear in the receiving VRF.
  4. Only explicitly permitted sources can inject protected tunnel traffic.

Explanation

Correct Answer

D:

Only explicitly permitted sources can inject protected tunnel traffic. This is the targeted operational evidence for the change. Encapsulation is not an authorization or confidentiality mechanism. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Run tunnel endpoints and their static or dynamic routes in the intended VRFs. Tenant-specific overlay routes should remain in their corresponding routing context. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Place or selectively leak the route into the proper VRF. Route lookup follows the interface's VRF unless route leaking is configured. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Use explicit controlled VRF route leaking rather than merging VRFs. Selective route exchange preserves separation while allowing sanctioned paths. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 175

One router carries many tenant tunnels and routing outputs are difficult to read. Which remediation best resolves the described symptom?

  1. Create separate VRF routing instances with dedicated interfaces.
  2. Reapply the interface IP after binding it to the VRF where required.
  3. Run tunnel endpoints and their static or dynamic routes in the intended VRFs.
  4. Protect the GRE path with IPsec or use a suitable encrypted tunnel mode.

Explanation

Correct Answer

C:

Tenant-specific overlay routes should remain in their corresponding routing context. The most direct remediation is run tunnel endpoints and their static or dynamic routes in the intended VRFs. A practical acceptance test is per-VRF route and tunnel checks isolate each tenant's forwarding path. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: Two customers use the same 10.10.0.0/16 prefixes on one router. VRF separation gives each tenant an independent routing table. It does not specifically correct the issue here: one router carries many tenant tunnels and routing outputs are difficult to read.

B:

This choice addresses a different situation: An engineer configures `ip vrf forwarding` and the interface loses its IPv4 address. Some IOS VRF-binding operations clear existing L3 interface addresses. It does not specifically correct the issue here: one router carries many tenant tunnels and routing outputs are difficult to read.

D:

This choice addresses a different situation: A GRE tunnel carries traffic but confidentiality is mandatory. GRE encapsulation alone does not encrypt user payloads. It does not specifically correct the issue here: one router carries many tenant tunnels and routing outputs are difficult to read.

Question 176

An operator has applied the following change: run tunnel endpoints and their static or dynamic routes in the intended VRFs. Which observation best confirms it works?

  1. `show ip route vrf` presents distinct routes for the overlapping prefix.
  2. Per-VRF route and tunnel checks isolate each tenant's forwarding path.
  3. `show ip interface brief vrf` shows the correctly restored address.
  4. Packet capture on the underlay shows encrypted ESP or protected tunnel traffic.

Explanation

Correct Answer

B:

Per-VRF route and tunnel checks isolate each tenant's forwarding path. This is the targeted operational evidence for the change. Tenant-specific overlay routes should remain in their corresponding routing context. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Create separate VRF routing instances with dedicated interfaces. VRF separation gives each tenant an independent routing table. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Reapply the interface IP after binding it to the VRF where required. Some IOS VRF-binding operations clear existing L3 interface addresses. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Protect the GRE path with IPsec or use a suitable encrypted tunnel mode. GRE encapsulation alone does not encrypt user payloads. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 177

Endpoint addresses move between fabric sites but the underlay locator changes. Which action most directly addresses this situation?

  1. Use LISP EID-to-RLOC mapping to separate endpoint identity from location.
  2. Query the LISP map resolver and mapping system for the destination EID.
  3. Inspect locator priorities weights and map-cache selection.
  4. Allocate separate VXLAN network identifiers for isolated segments.

Explanation

Correct Answer

A:

EIDs name endpoints while RLOCs identify transport reachability. The most direct remediation is use LISP EID-to-RLOC mapping to separate endpoint identity from location. A practical acceptance test is a map reply maps the preserved endpoint EID to its new locator. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A border device needs to locate a remote LISP endpoint without flooding all locations. The mapping system provides routable locator knowledge for remote endpoints. It does not specifically correct the issue here: endpoint addresses move between fabric sites but the underlay locator changes.

C:

This choice addresses a different situation: Traffic exits one fabric edge then returns through a separate edge unexpectedly. RLOC policies govern which endpoint locator is preferred. It does not specifically correct the issue here: endpoint addresses move between fabric sites but the underlay locator changes.

D:

This choice addresses a different situation: Two tenant overlays must use the same physical underlay but different logical segments. A 24-bit VNI selects the logical overlay segment. It does not specifically correct the issue here: endpoint addresses move between fabric sites but the underlay locator changes.

Question 178

An operator has applied the following change: use LISP EID-to-RLOC mapping to separate endpoint identity from location. Which observation best confirms it works?

  1. LISP map-cache contains a remote EID prefix with resolved locator.
  2. Map-cache displays intended locator priority and forwarded path uses that RLOC.
  3. Packet capture shows different VNIs for the tenant segments.
  4. A map reply maps the preserved endpoint EID to its new locator.

Explanation

Correct Answer

D:

A map reply maps the preserved endpoint EID to its new locator. This is the targeted operational evidence for the change. EIDs name endpoints while RLOCs identify transport reachability. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Query the LISP map resolver and mapping system for the destination EID. The mapping system provides routable locator knowledge for remote endpoints. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

B:

This observation validates another operation: Inspect locator priorities weights and map-cache selection. RLOC policies govern which endpoint locator is preferred. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Allocate separate VXLAN network identifiers for isolated segments. A 24-bit VNI selects the logical overlay segment. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

Question 179

A border device needs to locate a remote LISP endpoint without flooding all locations. What is the most effective configuration or design response?

  1. Register its EID-to-RLOC mappings with a map server.
  2. Encapsulate Layer-2 segments in VXLAN over the IP transport.
  3. Query the LISP map resolver and mapping system for the destination EID.
  4. Repair L3 underlay reachability between the VTEP addresses.

Explanation

Correct Answer

C:

The mapping system provides routable locator knowledge for remote endpoints. The most direct remediation is query the LISP map resolver and mapping system for the destination EID. A practical acceptance test is lISP map-cache contains a remote EID prefix with resolved locator. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: A LISP edge reports endpoint location updates to the mapping service. Map registration makes local EID locations discoverable to other sites. It does not specifically correct the issue here: a border device needs to locate a remote LISP endpoint without flooding all locations.

B:

This choice addresses a different situation: A routed underlay must carry Ethernet frames between distant virtual network segments. VXLAN carries L2 frames within UDP encapsulation across a routed fabric. It does not specifically correct the issue here: a border device needs to locate a remote LISP endpoint without flooding all locations.

D:

This choice addresses a different situation: A VTEP cannot deliver overlay frames because the remote VTEP IP is unreachable. VXLAN tunnel forwarding depends on an ordinary IP path between endpoints. It does not specifically correct the issue here: a border device needs to locate a remote LISP endpoint without flooding all locations.

Question 180

After implementing query the LISP map resolver and mapping system for the destination EID., which operational evidence should an engineer collect?

  1. The map server accepts an entry with the correct EID prefix and locator.
  2. LISP map-cache contains a remote EID prefix with resolved locator.
  3. Underlay capture shows VXLAN UDP 4789 between VTEPs.
  4. VTEP source can reach remote VTEP IP before VXLAN traffic succeeds.

Explanation

Correct Answer

B:

LISP map-cache contains a remote EID prefix with resolved locator. This is the targeted operational evidence for the change. The mapping system provides routable locator knowledge for remote endpoints. Merely entering the configuration or seeing a management session is less conclusive than observing the resulting behavior.

Incorrect Answers

A:

This observation validates another operation: Register its EID-to-RLOC mappings with a map server. Map registration makes local EID locations discoverable to other sites. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

C:

This observation validates another operation: Encapsulate Layer-2 segments in VXLAN over the IP transport. VXLAN carries L2 frames within UDP encapsulation across a routed fabric. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

D:

This observation validates another operation: Repair L3 underlay reachability between the VTEP addresses. VXLAN tunnel forwarding depends on an ordinary IP path between endpoints. It is not decisive evidence that the change under examination works as required. A relevant verification must exercise its particular control or forwarding outcome.

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