Nokia 4A0-112 Exam Questions Instant Access

Question 1

Which of the following statements about router interfaces on a Nokia 7750 SR is FALSE?

AThey can be used in pairs on the same subnet for redundancy.

BThey can be assigned IPv4 and/or IPv6 addresses.

CThey can be logical or physical.

DThe system interface exists by default.

Answer : A

Typically, interfaces on a Nokia 7750 SR router are not configured in pairs on the same subnet for redundancy. Instead, redundancy is achieved through mechanisms like Virtual Router Redundancy Protocol (VRRP) or other high availability protocols, not by simply using interfaces in pairs on the same subnet.

Question 2

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?

AThe head office has a default route and the branch office has a specific static route.

BThe head office and the branch offices both have specific static routes.

CThe head office and the branch office both have default routes.

DThe head office has a specific static route and the branch office has a default route.

Answer : A

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.

Question 3

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 R1 to router R7, and from router R7 to router R1?

ARouter R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).

BRouter R1 to router R7 will follow (R1-R2-R4-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).

CRouter R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R4-R2-R1).

DRouter R1 to router R7 will follow (R1-R3-R5-R6-R7). Router R7 to router R1 will follow (R7-R6-R5-R3-R1).

Answer : A

From R1 to R7: The path will be R1 R2 R4 R6 R7 because this path has the least cumulative metric of 10 + 10 + 10 + 10 = 40.

From R7 to R1: The reverse path will follow R7 R6 R4 R2 R1 because it is the shortest return path with the same metrics.

Question 4

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?

ARouter R4 will have a route to router R6's system IP address with router R2 as the next-hop.

BRouter R4 will have a default route with router R2 as the next-hop.

CRouter R4 will have a default route with router R3 as the next-hop.

DRouter R4 will not have a matching entry in its routing table for router R6's system IP address.

Answer : A

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.

Question 5

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?

AThere is no route leaking configured on router R1 or router R2.

BRoute leaking is configured on router R1 but not on router R2.

CRoute leaking is configured on router R2 but not on router R1.

DRoute leaking is configured on both routers R1 and R2.

Answer : D

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.

Question 6

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?

AControl Processing Module (CMP)

BMedia Dependent Adapter (MDA)

CSwitch Fabric (SF)

DInput/Output Module (IOM)

Answer : D

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.

Question 7

Refer to the exhibit.

Which of the following statements best describes the IS-IS domain to which the command output corresponds?

ASingle-area IS-IS domain with no broadcast interfaces.

BMulti-area IS-IS domain with no broadcast interfaces.

CSingle-area IS-IS domain with broadcast interfaces.

DMulti-area IS-IS domain with broadcast interfaces.

Answer : D

The output shows two levels of IS-IS databases: Level 1 (L1) and Level 2 (L2). This indicates that the domain is multi-area, as L1 routers are confined to a single area, while L2 routers can route between different areas. The presence of Level 1/Level 2 (L1/L2) routers also suggests that the domain spans multiple areas.

The LSP (Link-State PDU) entries show L1/L2 ATT attributes, which typically indicate that these routers are capable of routing both within their own area (Level 1) and across areas (Level 2), suggesting a multi-area design.

The IS-IS domain likely includes broadcast interfaces, as indicated by the 'ATT' attribute (typically referring to the type of interface) and common IS-IS configuration practices on broadcast networks like Ethernet.

Nokia IS-IS Routing Protocol 4A0-112 Exam Questions