A network engineer is troubleshooting a GRE tunnel that is up but not passing traffic. The engineer checks the routing table and sees that the route to the remote site's loopback is pointing to the GRE tunnel interface. However, pings from the local router to the remote loopback fail. The engineer also notices that the tunnel's source address is a loopback on the local router, and the destination is a loopback on the remote router. What is the most likely issue?

The tunnel's MTU is too small, causing fragmentation.

The remote router's loopback is not reachable via the GRE tunnel.

The GRE tunnel is not configured with a keepalive.

The tunnel's source and destination addresses are swapped on the remote router.

A network administrator is monitoring a GRE tunnel and wants to verify that the tunnel is actually passing traffic. The administrator runs 'show interfaces gr-0/0/0' and sees that the output packet count is increasing. What does this indicate?

The router is successfully encapsulating and sending packets through the tunnel.

The tunnel is experiencing a routing loop.

The router is receiving encapsulated packets from the remote end.

The tunnel's keepalive mechanism is sending GRE packets.

A service provider is interconnecting two customer sites across an MPLS backbone. The network engineer creates a GRE tunnel between two provider edge (PE) routers. The tunnel source and destination are configured with loopback addresses that are reachable via the MPLS network. After committing the configuration, the tunnel interface shows 'Up' but the customer's BGP session over the tunnel fails to establish. What is the most likely cause of this issue?

The tunnel interface lacks a valid IP address in the same subnet as the customer's loopback.

The tunnel interface IP addresses on both ends are not in the same subnet.

The tunnel's destination address is not reachable from the source router.

The tunnel's source and destination addresses are not in the same subnet.

A network engineer is configuring a GRE tunnel between two routers. The engineer wants to use a loopback address as the tunnel source to ensure that the tunnel remains up even if a physical interface fails. What is the primary benefit of using a loopback address as the tunnel source?

It provides a stable source address that is not dependent on a single physical interface.

It reduces the MTU of the tunnel.

It automatically configures a GRE key for the tunnel.

It allows the tunnel to carry both IPv4 and IPv6 traffic.

Juniper NetworksCertified Specialist, Service Provider Routing and Switching (JNCIS-SP)

Domain 9Objective 3

Configure, Monitor, or Troubleshoot GRE JN0-364 Practice Questions (Page 2)

Part of the Tunnels domain, which makes up ~4% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~1–2 in this domain), expect 1–1 from this objective — we provide 14 practice questions to prepare you well beyond it. (estimate)

14questions here

3free pages

3concepts

Questions 6–10

6expert · medium
A network engineer is troubleshooting a GRE tunnel that is up but not passing traffic. The engineer checks the routing table and sees that the route to the remote site's loopback is pointing to the GRE tunnel interface. However, pings from the local router to the remote loopback fail. The engineer also notices that the tunnel's source address is a loopback on the local router, and the destination is a loopback on the remote router. What is the most likely issue?
Select an answer first
7foundation · medium
Which field in the output of 'show interfaces gr-0/0/0 terse' indicates the operational state of the GRE tunnel?
Select an answer first
8application · medium
A network administrator is monitoring a GRE tunnel and wants to verify that the tunnel is actually passing traffic. The administrator runs 'show interfaces gr-0/0/0' and sees that the output packet count is increasing. What does this indicate?
Select an answer first
9application · medium
A service provider is interconnecting two customer sites across an MPLS backbone. The network engineer creates a GRE tunnel between two provider edge (PE) routers. The tunnel source and destination are configured with loopback addresses that are reachable via the MPLS network. After committing the configuration, the tunnel interface shows 'Up' but the customer's BGP session over the tunnel fails to establish. What is the most likely cause of this issue?
Select an answer first
10application · medium
A network engineer is configuring a GRE tunnel between two routers. The engineer wants to use a loopback address as the tunnel source to ensure that the tunnel remains up even if a physical interface fails. What is the primary benefit of using a loopback address as the tunnel source?
Select an answer first

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Configure, Monitor, or Troubleshoot GRE JN0-364 Practice Questions (Page 2)

Questions 6–10

Which field in the output of 'show interfaces gr-0/0/0 terse' indicates the operational state of the GRE tunnel?

A network administrator is monitoring a GRE tunnel and wants to verify that the tunnel is actually passing traffic. The administrator runs 'show interfaces gr-0/0/0' and sees that the output packet count is increasing. What does this indicate?

A network engineer is configuring a GRE tunnel between two routers. The engineer wants to use a loopback address as the tunnel source to ensure that the tunnel remains up even if a physical interface fails. What is the primary benefit of using a loopback address as the tunnel source?

Keep studying — Tunnels