Nokia 4A0-112 Practice Exams
Last updated on Apr 07,2025- Exam Code: 4A0-112
- Exam Name: Nokia IS-IS Routing Protocol
- Certification Provider: Nokia
- Latest update: Apr 07,2025
Which of the following statements about IS-IS is FALSE?
- A . IS-IS uses the concept of level-1 and level-2 routers to implement hierarchy.
- B . In IS-IS, routers are associated with an area, not the interfaces.
- C . A router becomes level-2 when it is associated with the backbone area.
- D . A level-1 router forwards traffic to other areas through the nearest I eve I-1/1 eve I-2 router.
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 . 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.
Refer to the exhibit.
Which of the following statements best describes the IS-IS domain to which the command output corresponds?
- A . Single-area IS-IS domain with no broadcast interfaces.
- B . Multi-area IS-IS domain with no broadcast interfaces.
- C . Single-area IS-IS domain with broadcast interfaces.
- D . Multi-area IS-IS domain with broadcast interfaces.
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 . There is no route leaking configured on router R1 or router R2.
- B . Route leaking is configured on router R1 but not on router R2.
- C . Route leaking is configured on router R2 but not on router R1.
- D . Route leaking is configured on both routers R1 and R2.
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-R2-R5-R6).
- B . Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R2-R5-R6).
- C . Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
- D . Router R6 to router R3 will follow (R6-R5-R7-R4-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).
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 value of the Ethernet hello timers on the switches.
- 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 time taken by the switches to detect that the physical ports are down.
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 the new link-state advertisement, it acknowledges it, stores it, and forwards it to its own neighbors.
- B . If a router receives multiple copies of the new link-state advertisement, it will simply ignore all copies received after the first one.
- C . Every router that receives the new link-state advertisement updates its age field before forwarding it.
- D . Every router that receives the new link-state advertisement runs the SPF algorithm to recalculate its shortest-path tree and its forwarding database.
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 have a default route with router R2 as the next-hop.
- C . Router R4 will have a default route with router R3 as the next-hop.
- D . Router R4 will not have a matching entry in its routing table for router R6’s system IP address.
When using IS-IS in native mode for routing in a dual-stack IPv4/IPv6 environment, which of the following statements is FALSE?
- 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.
Which of the following is NOT a required configuration step to successfully run IS-IS on a router?
- A . The router needs to be associated with an IS-IS area ID.
- B . Layer-3 interfaces that will participate in IS-IS need to be identified.
- C . A reference bandwidth needs to be configured to calculate link costs.
- D . The IS-IS context needs to be enabled.