A GRE tunnel is configured between two routers, but the tunnel interface shows 'down'. What is the most likely cause?

The tunnel is not configured with a checksum

The tunnel source and destination addresses are not reachable from each other

The tunnel interface is not assigned an IP address

The tunnel is not configured with a key

Which Junos OS command would you use to verify that a GRE tunnel is up and operational?

show configuration interfaces gr-0/0/0

A network engineer is configuring a GRE tunnel on a Junos device. The tunnel source is set to a physical interface, and the tunnel destination is a remote router's IP address. What is a potential drawback of using a physical interface as the tunnel source?

If the physical interface goes down, the tunnel will also go down.

The tunnel will have a higher MTU.

The tunnel will not support routing protocols.

The tunnel will be less secure.

What is a common method to handle the increased packet size caused by GRE encapsulation?

Disable fragmentation on the tunnel interface

Increase the MTU on the physical interface to accommodate the larger packets

Use a larger physical MTU by enabling jumbo frames

Reduce the MTU on the tunnel interface to account for the GRE overhead

A GRE tunnel is configured between two Junos devices, but traffic is not passing through. The 'show interfaces terse' command shows the tunnel interface as 'up'. What should the engineer check next?

Check the routing table for a route to the tunnel destination.

Verify that the tunnel interface has an IP address assigned.

Verify that the tunnel source and destination are correctly configured.

Check the physical interface status.

Juniper NetworksCertified Specialist, Enterprise Routing and Switching (JNCIS-ENT)

Domain 8Objective 2

Generic Routing Encapsulation JN0-352 Practice Questions (Page 2)

Part of the Tunnels domain, which makes up ~7% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~2–4 in this domain), expect 1–1 from this objective — we provide 17 practice questions to prepare you well beyond it. (estimate)

17questions here

4free pages

6concepts

Questions 6–10

6foundation · easy
A GRE tunnel is configured between two routers, but the tunnel interface shows 'down'. What is the most likely cause?
Select an answer first
7foundation · easy
Which Junos OS command would you use to verify that a GRE tunnel is up and operational?
Select an answer first
8application · medium
A network engineer is configuring a GRE tunnel on a Junos device. The tunnel source is set to a physical interface, and the tunnel destination is a remote router's IP address. What is a potential drawback of using a physical interface as the tunnel source?
Select an answer first
9foundation · easy
What is a common method to handle the increased packet size caused by GRE encapsulation?
Select an answer first
10application · medium
A GRE tunnel is configured between two Junos devices, but traffic is not passing through. The 'show interfaces terse' command shows the tunnel interface as 'up'. What should the engineer check next?
Select an answer first

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