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Nokia IS-IS Routing Protocol Question and Answers

Nokia IS-IS Routing Protocol

Last Update Sep 18, 2025
Total Questions : 40

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Questions 1

Which of the following is NOT a function of the control plane a router?

Options:

A.  

To exchange signaling messages with other routers.

B.  

To determine the best way to forward packets.

C.  

To establish routing paths to deliver packets from source to destination and to reestablish them in case of failure.

D.  

To utilize the forwarding tables to forward data packets towards their destination.

Discussion 0
Questions 2

Static routing is to be used in a network between a corporate head office and a branch office. The head office has many connected subnetworks, whereas the branch office has one subnetwork and a single connection to the head office. Which of the following is the most likely configuration on the head office and branch office routers?

Options:

A.  

The head office has a default route and the branch office has a specific static route.

B.  

The head office and the branch offices both have specific static routes.

C.  

The head office and the branch office both have default routes.

D.  

The head office has a specific static route and the branch office has a default route.

Discussion 0
Questions 3

An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?

Options:

A.  

The router sends a copy of the referenced LSP from its database to its neighbor.

B.  

The router sends a CSNP to its neighbor describing the newer LSPs in its database.

C.  

The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.

D.  

The router sends a PSNP to its neighbor to request a copy of the LSP.

Discussion 0
Questions 4

A static route has been configured on router R1 to reach the PC at 139.120.121.2.

What might be causing the ping to fail?

Options:

A.  

Router R2 needs a static route to the PC.

B.  

Router R1 needs a static route to router R2.

C.  

The configured next hop does not belong to a subnet adjacent to R1.

D.  

The configured static route needs to be a default route.

Discussion 0
Questions 5

For a link-state routing protocol, which of the following statements about link-state updates is FALSE?

Options:

A.  

When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.

B.  

When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.

C.  

Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.

D.  

The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database

Discussion 0
Questions 6

All routers in the diagram are running an interior gateway protocol (IGP) and have been configured with an ECMP value of 4. Router R5 advertises the prefix 192.168.3.0/24 using the IGP. Assuming all links have the same cost, how many entries for prefix 192.168.3.0/24 will be in router R3’s routing table?

Options:

A.  

1

B.  

2

C.  

3

D.  

4

Discussion 0
Questions 7

A series of actions are triggered on a router as a result of enabling both loopfree-alternate for a link-state routing protocol and ip-fast-reroute. Which of the following is NOT one of those actions?

Options:

A.  

Calculating the shortest-path next hop for each known IP prefix.

B.  

Calculating a backup next hop for each known IP prefix, if it exists, that would not create a routing loop if used without informing other routers.

C.  

Installing two entries in the FIB for IP prefixes, one active and one in standby mode.

D.  

Enabling the router to locally repair the active path to an IP prefix in case of failure.

Discussion 0
Questions 8

On a broadcast interface, an IS-IS router receives an LSP that is newer than the one on its database. Which of the following statements best describes the actions taken by the router as a consequence?

Options:

A.  

The router sends back a copy of the LSP from its database to its neighbor.

B.  

The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.

C.  

The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.

D.  

The router updates its database with the LSP and acknowledges it with a PSNP.

Discussion 0
Questions 9

Routers R1 through R4 in the diagram have established IS-IS adjacencies. Router R1 is L1/L2 and is the DIS of its two broadcast interfaces. How many LSPs will it generate?

Options:

A.  

2

B.  

3

C.  

4

D.  

5

Discussion 0
Questions 10

Which of the following definitions best describes route redistribution?

Options:

A.  

It is the process of deciding at line-rate speed which packets will be dropped and which ones will be forwarded.

B.  

It is the process of redirecting packets to be processed by an intermediate network function before allowing them to be forwarded to their intended final destination.

C.  

It is the process of passing routing information from one routing domain to another, which usually means from one routing protocol to another.

D.  

It is the process of controlling which route advertisements received from routing peers are accepted and/or deciding which locally known prefixes are advertised to routing peers.

Discussion 0
Questions 11

When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?

Options:

A.  

All links are assumed to be IPv4- and IPv6-capable.

B.  

The same topology information is used to calculate the shortest path tree for both IPv4 and IPv6.

C.  

In a multi-area environment, the SPF algorithm needs to be run four times on each L1/L2 router.

D.  

It may lead to traffic black-holing if not properly designed.

Discussion 0
Questions 12

Routers R1 through R4 are running an IGP in such a way that they have each other’s system IP addresses in their routing tables. A static route is configured on router R1 so that it can reach subnetwork 10.4.100.0/24. The network administrator decides to use an indirect static route, as shown in the diagram. However, pinging the server from router R1 fails. What may be the problem in this case?

Options:

A.  

Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.

B.  

Router R2 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.

C.  

Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.

D.  

The echo request arrives at the server but there is no path for the echo response to return to router R1.

Discussion 0