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最實用的4A0-112認證考試資料

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4A0-112認證考試的參考資料

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Nokia 4A0-112考試是一項全面性認證，涵蓋與IS-IS路由協議相關的各種主題。其中一些主題包括IS-IS路由算法、網絡拓撲、IS-IS配置選項和故障排除技術。通過考試的候選人可以展示他們使用IS-IS管理複雜網絡的能力，更有可能被尋求合格網絡管理員的組織所尋找。

最新的 Nokia Network Routing Specialist II 4A0-112 免費考試真題 (Q13-Q18):

問題 #13
Which component of the Nokia 7750 SR is in charge of performing the longest prefix match lookup on packets that arrive on the physical interfaces?

A. Input/Output Module (IOM)
B. Control Processing Module (CMP)
C. Media Dependent Adapter (MDA)
D. Switch Fabric (SF)

答案：A

解題說明：
The Input/Output Module (IOM) is responsible for performing the longest prefix match (LPM) lookup on packets that arrive at the physical interfaces. The IOM performs this function by examining the destination IP address of incoming packets and using the routing table to determine the best match.

問題 #14
Refer to the exhibit.

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?

A. Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
B. Router R2 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
C. Router R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.
D. The echo request arrives at the server but there is no path for the echo response to return to router R1.

答案：D

解題說明：
The static route configured on router R1 uses an indirect next-hop, which is 10.10.10.3 (R3). While the echo request from R1 reaches the server through the IGP, the problem lies in the return path for the echo response.
The route 10.4.100.0/24 is reachable through R3, but there is no reciprocal route in R3's routing table that allows the response to flow back towards R1. This results in a failure to return the echo response to R1, causing the ping to fail.

問題 #15
A router is trying to establish an IS-IS adjacency with the DIS on a broadcast link. What event causes the adjacency to change from "Initializing" to "UP"?

A. Receiving the last LSP requested from the DIS.
B. Receiving a Hello packet from the DIS that contains the local router's own MAC address in the neighbor list.
C. Receiving the first CSNP packet from the DIS that lists the LSPs in the DIS's link-state database.
D. Receiving a CSNP packet from the DIS acknowledging the last transmitted LSP.

答案：C

解題說明：
The process of establishing an IS-IS adjacency on a broadcast link involves several steps, and the transition from the Initializing state to the UP state occurs when both routers exchange sufficient information to confirm they have a consistent view of the link-state database.
The CSNP (Complete Sequence Number PDU) packet is used to advertise the list of LSPs in the router's link-state database. When a router receives the first CSNP from the DIS (Designated Intermediate System) that lists the LSPs in the DIS's database, it indicates that the router has enough information to establish the adjacency and synchronize its database.

問題 #16
There are several differences between IS-IS Hello packets used on broadcast interfaces and on point-to-point interfaces.
Which of the following statements is FALSE?

A. On broadcast interfaces there are different Hello packet types for level-1 and level-2 adjacencies, whereas on point-to-point interfaces there is a single Hello packet type.
B. The neighbors are identified using their interface MAC addresses on broadcast Hello messages and using their system IDs on point-to-point Hello messages.
C. The multicast MAC addresses to which the Hello messages are sent are different on broadcast interfaces and on point-to-point interfaces.
D. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.

答案：B

問題 #17
Refer to the exhibit.

All routers in the diagram are running a link-state routing protocol. Before the link failure, all routers have operational adjacencies with each other and there is a BFD session between routers R1 and R3. After the link failure, which of the following affects the routing protocol's convergence time?

A. The time taken by the switches to detect that the physical ports are down.
B. The value of the routing protocol hello timers on routers R1 and R3.
C. The value of the BFD transmit interval, receive interval and multiplier settings on routers R1 and R3.
D. The value of the Ethernet hello timers on the switches.

答案：C

解題說明：
BFD (Bidirectional Forwarding Detection) is used to detect link failures quickly and helps improve convergence time in link-state routing protocols. The BFD session between routers R1 and R3 allows them to detect the failure of the link between them more quickly than the regular routing protocol hello timers. The transmit interval, receive interval, and multiplier settings determine how fast BFD detects a failure and triggers the routing protocol to converge, which directly impacts the convergence time.

問題 #18
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