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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 17

Question 160

The change request says: fix tunnel routing recursion by using a physical-underlay next hop. Which verification result is most decisive?

  1. Matching child SAs carry increasing encapsulation and decapsulation counters.
  2. The tunnel destination resolves through a real WAN interface instead.
  3. Protected packets increment IPsec encrypt counters on the configured interface.
  4. `show vrf interface` lists each interface under its intended tenant VRF.

Explanation

Correct Answer

B:

The tunnel destination resolves through a real WAN interface instead. This is the targeted operational evidence for the change. Self-referential tunnel routes prevent establishment of the transport path. 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: Check interesting traffic selectors and routes in addition to IKE negotiation. An established IKE SA is not proof that the correct data traffic is protected. 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: Bind the intended transform or IPsec profile to the correct tunnel or crypto policy. Negotiation alone does not force payload packets into encryption. 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: Verify exact `vrf forwarding` membership on every L3 interface. Physical interface reuse does not guarantee correct tenant routing-context assignment. 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 161

An IPsec tunnel is established but internal networks are not reachable. Which change should the network engineer prioritize?

  1. Check interesting traffic selectors and routes in addition to IKE negotiation.
  2. Make supported encryption authentication and DH proposals agree.
  3. Choose compatible GRE tunnel mode and tunnel interface addressing for both payload families.
  4. Account for GRE/IPsec header overhead using suitable MTU and MSS adjustment.

Explanation

Correct Answer

A:

An established IKE SA is not proof that the correct data traffic is protected. The most direct remediation is check interesting traffic selectors and routes in addition to IKE negotiation. A practical acceptance test is matching child SAs carry increasing encapsulation and decapsulation counters. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: VPN peers have disjoint IKE proposal parameters and never form a security association. IKE peers need a compatible negotiated policy to authenticate and derive keys. It does not specifically correct the issue here: an IPsec tunnel is established but internal networks are not reachable.

C:

This choice addresses a different situation: A remote private network requires both IPv4 and IPv6 over one GRE underlay. GRE can transport different inner protocol families with a supported encapsulation. It does not specifically correct the issue here: an IPsec tunnel is established but internal networks are not reachable.

D:

This choice addresses a different situation: A tunnel interface line protocol is up while all user sessions fail due to MTU. Encapsulation reduces usable payload size and can drop fragmented/DF packets. It does not specifically correct the issue here: an IPsec tunnel is established but internal networks are not reachable.

Question 162

A post-change test follows this action: check interesting traffic selectors and routes in addition to IKE negotiation. Which result demonstrates success?

  1. IKE SA transitions to established with an agreed proposal.
  2. Both inner address-family routes traverse the same transport tunnel.
  3. Path MTU testing succeeds with payload sizes below the protected tunnel limit.
  4. Matching child SAs carry increasing encapsulation and decapsulation counters.

Explanation

Correct Answer

D:

Matching child SAs carry increasing encapsulation and decapsulation counters. This is the targeted operational evidence for the change. An established IKE SA is not proof that the correct data traffic is protected. 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: Make supported encryption authentication and DH proposals agree. IKE peers need a compatible negotiated policy to authenticate and derive keys. 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: Choose compatible GRE tunnel mode and tunnel interface addressing for both payload families. GRE can transport different inner protocol families with a supported encapsulation. 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: 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.

Question 163

VPN peers have disjoint IKE proposal parameters and never form a security association. Which remediation best resolves the described symptom?

  1. Bind the intended transform or IPsec profile to the correct tunnel or crypto policy.
  2. Verify exact `vrf forwarding` membership on every L3 interface.
  3. Make supported encryption authentication and DH proposals agree.
  4. Apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust.

Explanation

Correct Answer

C:

IKE peers need a compatible negotiated policy to authenticate and derive keys. The most direct remediation is make supported encryption authentication and DH proposals agree. A practical acceptance test is iKE SA transitions to established with an agreed proposal. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: An IPsec peer authenticates but traffic still flows unencrypted. Negotiation alone does not force payload packets into encryption. It does not specifically correct the issue here: vPN peers have disjoint IKE proposal parameters and never form a security association.

B:

This choice addresses a different situation: Traffic between two VRFs is unintentionally visible after interface reuse. Physical interface reuse does not guarantee correct tenant routing-context assignment. It does not specifically correct the issue here: vPN peers have disjoint IKE proposal parameters and never form a security association.

D:

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: vPN peers have disjoint IKE proposal parameters and never form a security association.

Question 164

During acceptance testing after make supported encryption authentication and DH proposals agree., which evidence is most relevant?

  1. Protected packets increment IPsec encrypt counters on the configured interface.
  2. IKE SA transitions to established with an agreed proposal.
  3. `show vrf interface` lists each interface under its intended tenant VRF.
  4. Only explicitly permitted sources can inject protected tunnel traffic.

Explanation

Correct Answer

B:

IKE SA transitions to established with an agreed proposal. This is the targeted operational evidence for the change. IKE peers need a compatible negotiated policy to authenticate and derive keys. 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: Bind the intended transform or IPsec profile to the correct tunnel or crypto policy. Negotiation alone does not force payload packets into encryption. 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: Verify exact `vrf forwarding` membership on every L3 interface. Physical interface reuse does not guarantee correct tenant routing-context assignment. 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: 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.

Question 165

An IPsec peer authenticates but traffic still flows unencrypted. How should the team implement the required behavior?

  1. Bind the intended transform or IPsec profile to the correct tunnel or crypto policy.
  2. Choose compatible GRE tunnel mode and tunnel interface addressing for both payload families.
  3. Account for GRE/IPsec header overhead using suitable MTU and MSS adjustment.
  4. Run tunnel endpoints and their static or dynamic routes in the intended VRFs.

Explanation

Correct Answer

A:

Negotiation alone does not force payload packets into encryption. The most direct remediation is bind the intended transform or IPsec profile to the correct tunnel or crypto policy. A practical acceptance test is protected packets increment IPsec encrypt counters on the configured interface. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A remote private network requires both IPv4 and IPv6 over one GRE underlay. GRE can transport different inner protocol families with a supported encapsulation. It does not specifically correct the issue here: an IPsec peer authenticates but traffic still flows unencrypted.

C:

This choice addresses a different situation: A tunnel interface line protocol is up while all user sessions fail due to MTU. Encapsulation reduces usable payload size and can drop fragmented/DF packets. It does not specifically correct the issue here: an IPsec peer authenticates but traffic still flows unencrypted.

D:

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 IPsec peer authenticates but traffic still flows unencrypted.

Question 166

An operator has applied the following change: bind the intended transform or IPsec profile to the correct tunnel or crypto policy. Which observation best confirms it works?

  1. Both inner address-family routes traverse the same transport tunnel.
  2. Path MTU testing succeeds with payload sizes below the protected tunnel limit.
  3. Per-VRF route and tunnel checks isolate each tenant's forwarding path.
  4. Protected packets increment IPsec encrypt counters on the configured interface.

Explanation

Correct Answer

D:

Protected packets increment IPsec encrypt counters on the configured interface. This is the targeted operational evidence for the change. Negotiation alone does not force payload packets into encryption. 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: Choose compatible GRE tunnel mode and tunnel interface addressing for both payload families. GRE can transport different inner protocol families with a supported encapsulation. 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: 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.

C:

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.

Question 167

A remote private network requires both IPv4 and IPv6 over one GRE underlay. What is the most appropriate corrective measure?

  1. Verify exact `vrf forwarding` membership on every L3 interface.
  2. Apply ACLs or authenticated IPsec security rather than treating GRE encapsulation as trust.
  3. Choose compatible GRE tunnel mode and tunnel interface addressing for both payload families.
  4. Create separate VRF routing instances with dedicated interfaces.

Explanation

Correct Answer

C:

GRE can transport different inner protocol families with a supported encapsulation. The most direct remediation is choose compatible GRE tunnel mode and tunnel interface addressing for both payload families. A practical acceptance test is both inner address-family routes traverse the same transport tunnel. This distinguishes a configured intention from operational success.

Incorrect Answers

A:

This choice addresses a different situation: Traffic between two VRFs is unintentionally visible after interface reuse. Physical interface reuse does not guarantee correct tenant routing-context assignment. It does not specifically correct the issue here: a remote private network requires both IPv4 and IPv6 over one GRE underlay.

B:

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 remote private network requires both IPv4 and IPv6 over one GRE underlay.

D:

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 remote private network requires both IPv4 and IPv6 over one GRE underlay.

Question 168

After implementing choose compatible GRE tunnel mode and tunnel interface addressing for both payload families., which operational evidence should an engineer collect?

  1. `show vrf interface` lists each interface under its intended tenant VRF.
  2. Both inner address-family routes traverse the same transport tunnel.
  3. Only explicitly permitted sources can inject protected tunnel traffic.
  4. `show ip route vrf` presents distinct routes for the overlapping prefix.

Explanation

Correct Answer

B:

Both inner address-family routes traverse the same transport tunnel. This is the targeted operational evidence for the change. GRE can transport different inner protocol families with a supported encapsulation. 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: Verify exact `vrf forwarding` membership on every L3 interface. Physical interface reuse does not guarantee correct tenant routing-context assignment. 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: 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.

D:

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.

Question 169

Traffic between two VRFs is unintentionally visible after interface reuse. Which action most directly addresses this situation?

  1. Verify exact `vrf forwarding` membership on every L3 interface.
  2. Account for GRE/IPsec header overhead using suitable MTU and MSS adjustment.
  3. Run tunnel endpoints and their static or dynamic routes in the intended VRFs.
  4. Place or selectively leak the route into the proper VRF.

Explanation

Correct Answer

A:

Physical interface reuse does not guarantee correct tenant routing-context assignment. The most direct remediation is verify exact `vrf forwarding` membership on every L3 interface. A practical acceptance test is `show vrf interface` lists each interface under its intended tenant VRF. This distinguishes a configured intention from operational success.

Incorrect Answers

B:

This choice addresses a different situation: A tunnel interface line protocol is up while all user sessions fail due to MTU. Encapsulation reduces usable payload size and can drop fragmented/DF packets. It does not specifically correct the issue here: traffic between two VRFs is unintentionally visible after interface reuse.

C:

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: traffic between two VRFs is unintentionally visible after interface reuse.

D:

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: traffic between two VRFs is unintentionally visible after interface reuse.

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.

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