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Nokia IS-IS Routing Protocol Sample Questions (Q36-Q41):
NEW QUESTION # 36
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?
- A. The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.
- B. The router sends back a copy of the LSP from its database to its neighbor.
- C. The router updates its database with the LSP and acknowledges it with a PSNP.
- D. The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.
Answer: D
Explanation:
When an IS-IS router receives a newer LSP (Link-State PDU) than the one already in its database, it takes the following actions:
Updates its link-state database with the new LSP.
Acknowledges the LSP with a PSNP (Partial Sequence Number PDU), which is sent to the router that originated the LSP, confirming the receipt of the newer LSP.
Floods a copy of the updated LSP to its neighbors on other interfaces to ensure all routers in the network have the updated topology information.
NEW QUESTION # 37
Which of the following statements about the IP forwarding process on a router is TRUE?
- A. It uses the ARP table to find a match for the destination MAC address.
- B. It uses the routing table to find a match for the source IP address.
- C. It uses the ARP table to find a match for the source MAC address.
- D. It uses the routing table to find a match for the destination IP address.
Answer: D
Explanation:
During the IP forwarding process, routers use the routing table to determine the next hop based on the destination IP address. The source IP address is not directly involved in the lookup process for forwarding.
The ARP table is used to map IP addresses to MAC addresses, specifically for resolving the MAC address of the next hop (destination MAC address) for forwarding packets within the local network.
NEW QUESTION # 38
For a link-state routing protocol, which of the following statements about link-state updates is FALSE?
- A. The age value is updated as the link-state update is flooded throughout the network and when it is in the link-state database
- 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. When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
- D. Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
Answer: C
Explanation:
When a link-state update reaches its maximum age, it is removed from the router's link-state database, not flooded to its neighbors. This prevents outdated information from continuing to affect the routing decisions. The router does not flood the aged update; instead, it will typically request a new link-state advertisement from the original source router if the information is still needed.
NEW QUESTION # 39
Two IS-IS routers are exchanging Hello packets. One is configured to use authentication and the other is not. Which of the following statements is TRUE?
- A. An adjacency will not be established.
- B. The two routers will negotiate the authentication parameters and the establish an adjacency.
- C. An adjacency will be established without authentication.
- D. An adjacency will be established with authentication using the default parameters defined for IS-IS routers.
Answer: A
Explanation:
IS-IS routers must have matching authentication settings to establish an adjacency. If one router is configured with authentication and the other is not, the routers will not be able to establish an adjacency because their authentication parameters do not match.
NEW QUESTION # 40
Refer to the exhibit.
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?
Answer: C
Explanation:
Router R1 is configured as L1/L2, meaning it is part of both Level 1 and Level 2 IS-IS routing areas. This means R1 will generate two types of LSPs:
Level 1 LSP (for the local area 49.0001) to advertise its local topology to other Level 1 routers.
Level 2 LSP (for the backbone area 49.0002) to advertise the global network topology to Level 2 routers.
R1 also has two broadcast interfaces, and as the Designated Intermediate System (DIS) on these interfaces, it will generate an LSP for each interface (one per broadcast link).
This results in three total LSPs:
A Level 1 LSP for the local area (49.0001).
A Level 2 LSP for the backbone area (49.0002).
An LSP for each of the two broadcast interfaces, which may include interface-related topology information.
NEW QUESTION # 41
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