リアル試験問題4A0-112問題集試験問題はここにある [2025年06月]
最新の2025年06月効果的な4A0-112テスト問題を使って合格突破
Nokia 4A0-112認定は、Nokia IS-ISルーティングプロトコルの専門知識を実証したいネットワークエンジニアにとって優れた選択肢です。この試験に合格すると、Nokia IS-ISを使用して大規模なサービスプロバイダーネットワークの設計、展開、トラブルシューティングの能力が示されます。この認定により、あなたはあなたの分野の専門家として認識され、それがより良い雇用機会とキャリアの成長につながる可能性があります。
質問 # 16
What do the address resolution protocol (ARP) for IPv4 and the neighbor discovery procedures for IPv6 have in common?
- A. Both resolve a host device's MAC address using its IP address.
- B. Both resolve a host device's IP address using its MAC address.
- C. Both detect duplicate MAC address assignments.
- D. Both detect duplicate IP address assignments.
正解：A
解説：
ARP for IPv4 and Neighbor Discovery Protocol (NDP) for IPv6 are both used to map a device's IP address to its MAC address. This is essential for communication within a local network.
ARP is used in IPv4 networks, and NDP performs a similar function in IPv6 networks, ensuring devices can communicate effectively on the same network segment.
質問 # 17
Refer to the exhibit.
In the diagram, all routers are using IS-IS as their routing protocol. The number next to each link is its metric value.
What path will traffic follow from router R6 to router R3, and from router R3 to router R6?
- A. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R2-R5-R6).
- B. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R2-R5-R6).
- C. Router R6 to router R3 will follow (R6-R5-R7-R4-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
- D. Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
正解：B
解説：
The metric values between the routers dictate the routing paths, and IS-IS will calculate the shortest path based on these values.
R6 to R3: The path from R6 to R3 will go through R5 and R2, as this route has the least cumulative metric (10 + 10 + 15 = 35).
R3 to R6: The reverse path from R3 to R6 will follow R3 → R2 → R5 → R6 because this route is also the shortest with a total metric of 10 + 10 + 10 = 30.
質問 # 18
A router running a link-state routing protocol detects that one of its neighbors is no longer connected to it. The router generates a new link-state advertisement to inform other routers of the topology change. Which of the following is NOT an action that is triggered by this event?
- A. If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
- B. If a router receives the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.
- C. Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.
- D. Every router that receives the new link-state advertisement updates its age field before forwarding it.
正解：D
解説：
When a router receives a link-state advertisement (LSA), it does not update the age field before forwarding it. The age field in an LSA is typically updated by the originating router or during the process of forwarding the LSA within the network. Routers do not modify the age field upon receiving and forwarding an LSA.
質問 # 19
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)
正解：A
解説：
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.
質問 # 20
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 acknowledges it with a PSNP.
- B. The router sends back a copy of the LSP from its database to its neighbor.
- 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 floods a copy to its neighbors on other interfaces.
正解：C
解説：
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.
質問 # 21
A routing domain uses a link-state routing protocol. Which of the following would NOT be an advantage of dividing the entire routing domain into areas?
- A. Route tables can be reduced by summarizing the IP prefixes advertised between areas.
- B. Detailed topology information is only shared among routers within the same area, thus reducing the complexity of the SPF calculation.
- C. Less-capable routers can be isolated from having to keep track of IP prefixes that are external to the local routing domain.
- D. Fewer routers are required to handle the same amount of traffic, as compared to a single-area domain.
正解：D
解説：
Dividing a domain into areas typically does not reduce the number of routers needed to handle traffic. It is more focused on improving scalability, reducing the size of routing tables, and limiting the scope of SPF calculations, but it doesn't inherently reduce the number of routers required.
質問 # 22
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 R1 drops the echo request because address 10.10.10.3 does not belong to an adjacent router.
- B. Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
- C. Router R2 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.
正解：D
解説：
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.
質問 # 23
When multiple routing protocols offer a route for the same prefix, what part of the router is in charge of deciding which route to make active?
- A. The routing information base (RIB)
- B. The forwarding information base (FIB)
- C. The routing table manager (RTM)
- D. The equal cost multipath configuration
正解：C
解説：
The routing table manager (RTM) is responsible for selecting the best route when multiple routing protocols provide a route for the same destination prefix. It makes the decision on which route to add to the routing table based on the administrative distance, metric, and other criteria.
質問 # 24
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?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
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.
質問 # 25
A new router is added to a broadcast network. What does IS-IS use as the tiebreaker for selecting the DIS if the priorities are the same?
- A. The router with the highest system ID.
- B. The existing DIS remains the DIS.
- C. The router with the highest interface MAC address.
- D. The Hello packet with the highest sequence number.
正解：A
解説：
In IS-IS, the Designated Intermediate System (DIS) is responsible for certain tasks on broadcast networks, such as generating link-state advertisements and acting as the central point for flooding information.
質問 # 26
Consider the exhibit.
All routers are running IS-IS with IPv6 support enabled. Based on the topology shown, and the route tables of routers R3 and R4, which of the following statements is TRUE?
- A. Route leaking is configured on router R2 but not on router R1.
- B. Route leaking is configured on router R1 but not on router R2.
- C. There is no route leaking configured on router R1 or router R2.
- D. Route leaking is configured on both routers R1 and R2.
正解：D
解説：
From the route tables of R3 and R4, we can see that remote routes are present, with R3 and R4 both having routes referencing routers in different areas (Area 49.01 and 49.02). These remote routes are characteristic of route leaking, which is the process of sharing routes between different IS-IS areas.
R3 has routes for R1, R2, and R4, which are in Area 49.01, suggesting that R1 and R2 have advertised their routes to R3, possibly due to route leaking.
R4 has similar routes for R2 and R3, indicating that R2 might have advertised its routes to R4.
This sharing of routes between areas is indicative of route leaking being configured on both R1 and R2, allowing these routes to be shared across the areas.
質問 # 27
Refer to the exhibit.
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?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
解説：
In this scenario, the routers are configured with an Equal-Cost Multi-Path (ECMP) value of 4, meaning they can utilize up to 4 equal-cost paths to reach a destination. Since Router R5 is advertising the 192.168.3.0/24 prefix and all links have the same cost, router R3 will receive multiple routes to reach this destination.
Given that all the routers (R1, R2, R3, R4, and R5) are connected in a way that can support multiple equal-cost paths, and assuming ECMP is set to 4, the routing table on Router R3 will have up to 4 entries for the prefix 192.168.3.0/24.
Thus, Router R3's routing table will contain 4 entries for the prefix 192.168.3.0/24.
質問 # 28
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?
- 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. Enabling the router to locally repair the active path to an IP prefix in case of failure.
- D. Installing two entries in the FIB for IP prefixes, one active and one in standby mode.
正解：A
質問 # 29
Refer to the exhibit.
Examine the physical topology of the IS-IS network, the metrics of the links and the levels of the routers. All routers have their system interfaces included in IS-IS. Which of the following statements describes the route-table entry that router R4 will use to reach the system IP address of router R6?
- A. Router R4 will have a route to router R6's system IP address with router R2 as the next-hop.
- B. Router R4 will not have a matching entry in its routing table for router R6's system IP address.
- C. Router R4 will have a default route with router R2 as the next-hop.
- D. Router R4 will have a default route with router R3 as the next-hop.
正解：A
解説：
Router R4 is in Area 49.0001 and R6 is in Area 49.0002. Both routers are Level 2 (L2), meaning that they can communicate across areas using Level 2 IS-IS routing.
Since R2 is the L1/L2 router that connects both Area 49.0001 and Area 49.0002, it will be the next-hop for router R4 to reach R6's system IP address.
The IS-IS protocol will ensure that R4 will have a route to R6's system IP address via R2 as the next-hop.
質問 # 30
Refer to the exhibit.
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?
- A. The head office and the branch offices both have specific static routes.
- B. The head office and the branch office both have default routes.
- C. The head office has a default route and the branch office has a specific static route.
- D. The head office has a specific static route and the branch office has a default route.
正解：C
解説：
The head office has many connected subnetworks, so it will typically have a default route to forward traffic to the branch office (or external networks), since it may not need to define static routes for each branch network.
The branch office, which has only one subnetwork and a single connection to the head office, will have a specific static route to reach the head office subnet or other subnets at the head office, since it only needs to know the specific route to reach the head office's network.
質問 # 31
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