A spoke in a DMVPN Phase 3 network cannot establish a direct tunnel to another spoke. Which of the following is a likely cause?

The hub is configured with a higher NHRP holdtime than the spoke.

The spoke has not registered with the hub, so the hub cannot send NHRP redirects.

The spoke is using OSPF as the routing protocol, which does not support DMVPN.

The spoke's tunnel interface is configured with a public IP address instead of a tunnel IP address.

In a DMVPN Phase 3 network, a spoke-to-spoke tunnel fails to establish even though NHRP redirects are being received. What is a possible routing-related cause?

The routing protocol is not advertising the destination network via the hub, so the spoke does not have a route to trigger the redirect.

The IPsec transform set is incompatible between the spokes.

The NHRP network ID is mismatched between the spokes.

The hub is not configured with a tunnel key.

In a dual-hub DMVPN Phase 3 network, one hub fails. What is a common cause of traffic black-holing after the failure?

Spokes do not have a route to the backup hub's tunnel IP address.

The routing protocol is not configured to prefer the backup hub's routes, so spokes continue to send traffic to the failed hub.

The backup hub does not have a tunnel interface configured.

NHRP redirects are not sent by the backup hub because it is not configured as an NHRP server.

What is a key mechanism for NHRP server failover in a dual-hub DMVPN Phase 3 network?

Spokes automatically re-register with the backup hub only when the primary hub fails.

The backup hub sends NHRP redirects to all spokes when the primary hub fails.

Spokes register with both hubs, and if one hub fails, the other continues to provide NHRP services.

The hubs use HSRP to provide a virtual IP address for NHRP.

CCIE Enterprise Infrastructure

Domain 3Objective 3

DMVPN CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 2)

Part of the Transport Technologies and Solutions domain, which accounts for 15% of the CCIE-ENTERPRISE-INFRASTRUCTURE exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~8–12 in this domain), expect 3–4 from this objective — we provide 37 practice questions to prepare you well beyond it. (estimate)

37questions here

8free pages

5concepts

15%of the exam

Questions 6–10

6foundation · easy
A spoke in a DMVPN Phase 3 network cannot establish a direct tunnel to another spoke. Which of the following is a likely cause?
Select an answer first
7foundation · easy
In a DMVPN Phase 3 network, a spoke-to-spoke tunnel fails to establish even though NHRP redirects are being received. What is a possible routing-related cause?
Select an answer first
8foundation · easy
In a dual-hub DMVPN Phase 3 network, one hub fails. What is a common cause of traffic black-holing after the failure?
Select an answer first
9foundation · easy
What is a key mechanism for NHRP server failover in a dual-hub DMVPN Phase 3 network?
Select an answer first
10foundation · easy
Which command would you use on a spoke router to verify the NHRP mappings it has learned, including the public addresses of other spokes?
Select an answer first

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