A service provider operates an MPLS backbone with two directly connected PE routers, PE1 and PE2, running eBGP. The link between them is up, but the BGP session is stuck in Active state. The configuration on both routers shows the correct neighbor IP addresses and AS numbers. Which action should you take first to isolate the problem?

Confirm that the BGP neighbor is configured with the correct remote-as and that the local AS number matches the AS path.

Review the outbound route policy to confirm that the correct prefixes are being advertised.

Check the BGP neighbor's password configuration and ensure both sides use the same MD5 key.

Verify that the update-source interface is correct and that the neighbor IP is reachable via the routing table.

An IS-IS router is not receiving routes from a neighbor in a different area. The adjacency is up, and the router is receiving LSPs. What is the most likely cause?

The router has a different system ID than the neighbor.

The router is configured as level-1-only and the neighbor is level-2-only.

The router is not configured with the isis metric style.

The router is not configured with a NET.

An IS-IS network has two routers connected via a point-to-point link. They are not forming an adjacency. The interfaces are up, and the IP addresses are in the same subnet. Both routers have the same area address and NET. What is the most likely cause?

The routers have the same system ID, which is not allowed.

The routers have different metric styles.

The routers have different IS-IS levels configured.

The routers have different interface MTUs.

Two BGP routers are configured as iBGP peers. The session is up, but routes learned from an eBGP peer are not being propagated to the iBGP peer. What is the most likely reason?

The iBGP session is not using a loopback interface for the neighbor address.

The iBGP peer is not configured with the same AS number.

The next-hop-self command is not configured on the iBGP session.

The BGP table is full and cannot hold more routes.

An OSPF router is not advertising a redistributed static route to its neighbors. The static route is in the routing table, and redistribution is configured. What is the most likely cause?

The OSPF process ID is different on the router and its neighbors.

The static route has a high administrative distance.

The redistribute static command is missing the subnets keyword.

The OSPF router is not an ASBR.

CiscoCertified Network Professional Service Provider

Domain 2Objective 6

2.6 Troubleshoot Routing Protocols 350-501 Practice Questions (Page 1)

Part of the Networking domain, which accounts for 30% of the 350-501 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~15–24 in this domain), expect 2–3 from this objective — we provide 10 practice questions to prepare you well beyond it. (estimate)

10questions here

2free pages

6concepts

30%of the exam

Questions 1–5

1application · medium
A service provider operates an MPLS backbone with two directly connected PE routers, PE1 and PE2, running eBGP. The link between them is up, but the BGP session is stuck in Active state. The configuration on both routers shows the correct neighbor IP addresses and AS numbers. Which action should you take first to isolate the problem?
Select an answer first
2application · medium
An IS-IS router is not receiving routes from a neighbor in a different area. The adjacency is up, and the router is receiving LSPs. What is the most likely cause?
Select an answer first
3expert · hard
An IS-IS network has two routers connected via a point-to-point link. They are not forming an adjacency. The interfaces are up, and the IP addresses are in the same subnet. Both routers have the same area address and NET. What is the most likely cause?
Select an answer first
4application · medium
Two BGP routers are configured as iBGP peers. The session is up, but routes learned from an eBGP peer are not being propagated to the iBGP peer. What is the most likely reason?
Select an answer first
5application · medium
An OSPF router is not advertising a redistributed static route to its neighbors. The static route is in the routing table, and redistribution is configured. What is the most likely cause?
Select an answer first

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