You are configuring a GRE tunnel on a Cisco router. The physical interface Gi0/0 has IP 192.0.2.1/24. The remote tunnel endpoint is 192.0.2.2. You want the tunnel to use 10.0.0.1/30. Which command is required to set the tunnel source?

tunnel source GigabitEthernet0/0

A GRE tunnel is configured between R1 and R2. The tunnel is up/up, but you cannot ping the remote tunnel IP. You suspect an MTU issue. What is the best way to test this?

Use extended ping with a source of the physical interface.

Ping with the do-not-fragment bit set and varying packet sizes.

Check the tunnel interface statistics.

Ping with a large packet size and no DF bit.

A GRE tunnel is configured, but the tunnel interface shows up/down. The tunnel source is a physical interface that is up/up. What is the most likely cause?

The tunnel destination is unreachable.

The tunnel is missing a keepalive.

The tunnel IP is in the wrong subnet.

A network admin needs to connect two remote sites using a GRE tunnel. The WAN links are not stable, and the admin wants to ensure the tunnel is always available. What should be configured?

A dynamic routing protocol over the tunnel.

A backup tunnel with a different path.

GRE keepalives to monitor the tunnel.

A static route pointing to the tunnel interface.

You have configured a GRE tunnel and want to verify that the tunnel is passing traffic. Which command shows the number of packets encapsulated and decapsulated?

show running-config interface tunnel0

CCIE Enterprise Infrastructure

Domain 3Objective 1

Static Point-To-Point GRE Tunnels CCIE-ENTERPRISE-INFRASTRUCTURE Practice Questions (Page 5)

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 42 practice questions to prepare you well beyond it. (estimate)

42questions here

9free pages

4concepts

15%of the exam

Questions 21–25

21application · easy
You are configuring a GRE tunnel on a Cisco router. The physical interface Gi0/0 has IP 192.0.2.1/24. The remote tunnel endpoint is 192.0.2.2. You want the tunnel to use 10.0.0.1/30. Which command is required to set the tunnel source?
Select an answer first
22application · medium
A GRE tunnel is configured between R1 and R2. The tunnel is up/up, but you cannot ping the remote tunnel IP. You suspect an MTU issue. What is the best way to test this?
Select an answer first
23application · medium
A GRE tunnel is configured, but the tunnel interface shows up/down. The tunnel source is a physical interface that is up/up. What is the most likely cause?
Select an answer first
24application · medium
A network admin needs to connect two remote sites using a GRE tunnel. The WAN links are not stable, and the admin wants to ensure the tunnel is always available. What should be configured?
Select an answer first
25application · easy
You have configured a GRE tunnel and want to verify that the tunnel is passing traffic. Which command shows the number of packets encapsulated and decapsulated?
Select an answer first

Finished these 5 questions?

Review the revealed explanations, or continue through the curriculum.

Next 5 questions →Back to CCIE-ENTERPRISE-INFRASTRUCTURE

Free Basic Practice is a study aid with revealable answers — not a scored exam. Examers.io is independent and not affiliated with or endorsed by Cisco. “CCIE-ENTERPRISE-INFRASTRUCTURE” is a trademark of its owner, used for identification only.