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IS-IS代表Intermediate System to Intermediate System，它是一個協定，用於在路由器之間交換路由信息。Nokia IS-IS路由協定是Nokia路由器使用的IS-IS協定的實現。此協定用於大型規模的網絡，如互聯網，以提供有效的路由和維護穩定的連接。
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最新的 Nokia Network Routing Specialist II 4A0-112 免費考試真題 (Q41-Q46):
問題 #41
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. The two routers will negotiate the authentication parameters and the establish an adjacency.
- B. An adjacency will be established with authentication using the default parameters defined for IS-IS routers.
- C. An adjacency will not be established.
- D. An adjacency will be established without authentication.
答案：C
解題說明：
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.
問題 #42
Refer to the exhibit.
Routers R1, R2, R3, and R4 are running IS-IS. Assuming all interfaces are added to IS-IS as point-to-point and no commands are issued at the interface level to restrict adjacencies, which of the following statements is TRUE?
- A. All four routers are L1/L2.
- B. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1 routers.
- C. Routers R1 and R2 are L1/L2 routers. Routers R3 and R4 are L1 routers.
- D. Routers R1 and R2 are L2 routers. Routers R3 and R4 are L1/L2 routers.
答案：C
解題說明：
From the output, we can see that the usage column indicates whether a router is operating as an L1 or L2 router:
The L1/L2 designations refer to whether the routers participate in both Level 1 and Level 2 of IS-IS:
In this case, R1 and R2 are L2 routers, and R3 and R4 are L1 routers.
問題 #43
An IS-IS router receives a CSNP that references an older LSP than the one in its local database. What action is taken?
- A. The router sends a copy of the referenced LSP from its database to its neighbor.
- B. The router updates its database with the new sequence number and floods a copy of the LSP to its other neighbors.
- C. The router sends a CSNP to its neighbor describing the newer LSPs in its database.
- D. The router sends a PSNP to its neighbor to request a copy of the LSP.
答案：A
解題說明：
When a router receives a CSNP (Complete Sequence Number PDU) that references an older LSP (Link-State PDU) than the one in its local database, it indicates that the neighbor is missing newer information.
In response, the router sends back a PSNP (Partial Sequence Number PDU) to the neighbor, which includes a copy of the LSPs it has in its local database that the neighbor may not yet have. This helps to synchronize the link-state information between routers.
問題 #44
Refer to the exhibit.
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?
- A. The configured next hop does not belong to a subnet adjacent to R1.
- B. Router R1 needs a static route to router R2.
- C. The configured static route needs to be a default route.
- D. Router R2 needs a static route to the PC.
答案：A
解題說明：
In the configuration on router R1, the static route is defined with the next-hop IP address of 139.120.121.1.
However, the next-hop IP address 139.120.121.1 does not belong to the same subnet as the directly connected interface on R1, which is 172.31.1.1/30. For the static route to work properly, the next-hop IP address must be reachable via a directly connected interface, meaning it must be within the same subnet.
Therefore, this mismatch in subnet adjacency is likely causing the failure to reach the destination (139.120.121.2).
問題 #45
For a link-state routing protocol, which of the following statements about link-state updates is FALSE?
- A. When a router detects that a link-state update has reached its maximum age, it will request a new update from the source router.
- B. Aging helps ensure that routers that are no longer part of the topology will eventually get removed from the link-state database.
- C. When a link-state update reaches its maximum age on a router, the router will flood that update to its neighbors.
- 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
答案：C
解題說明：
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.
問題 #46
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