Steps Necessary To Pass The 4A0-112 Exam from Training Expert TestSimulate

Valid Way To Pass Nokia Network Routing Specialist II's 4A0-112 Exam

IS-IS (Intermediate System to Intermediate System) is a link-state routing protocol that is widely used in large-scale networks. It is a robust and scalable protocol that can handle a large number of network devices in a single domain. Nokia's IS-IS protocol is based on the IETF standard and supports IPv4, IPv6, and MPLS forwarding. The protocol uses a hierarchical network design that enables efficient and fast routing.

 

NEW QUESTION # 17
What is the replacement for ARP in IPv6?

• A. Router discovery procedures.
• B. Stateless address auto-configuration procedures.
• C. Duplicate address detection procedures.
• D. Neighbor discovery procedures.

Answer: D

Explanation:
In IPv6, the Neighbor Discovery Protocol (NDP) replaces the Address Resolution Protocol (ARP) used in IPv4. NDP is responsible for several functions, including resolving IP addresses to MAC addresses (similar to ARP), detecting duplicate IP addresses, and discovering other devices on the network.

NEW QUESTION # 18
Which of the following statements regarding the databases used by a link-state routing protocol in a single-are routing domain is FALSE?

• A. The link-state database has the local topology and IP reachability information advertised by all the routers.
• B. The link-state database is the same for all routers.
• C. The adjacency database contains information about all the links interconnecting the domain's routers.
• D. The forwarding database contains the optimum next hop for each known prefix.

Answer: C

Explanation:
The adjacency database contains information about the state of the router's adjacencies (i.e., the routers that it is directly connected to and has established a neighbor relationship with). It does not store information about all links in the domain; that information is stored in the link-state database.

NEW QUESTION # 19
Which of the following is NOT a required configuration step to successfully run IS-IS on a router?

• A. The IS-IS context needs to be enabled.
• B. Layer-3 interfaces that will participate in IS-IS need to be identified.
• C. The router needs to be associated with an IS-IS area ID.
• D. A reference bandwidth needs to be configured to calculate link costs.

Answer: D

Explanation:
While configuring a reference bandwidth (which is used to calculate link costs) can be useful, it is not strictly required for IS-IS to run. IS-IS uses default bandwidth values to calculate costs, and it can function without explicitly configuring a reference bandwidth.

NEW QUESTION # 20
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. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
• 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. 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.

Answer: B

Explanation:
In both broadcast and point-to-point interfaces, IS-IS routers identify neighbors using system IDs, not interface MAC addresses. The system ID is a unique identifier assigned to each router, and it is used to identify neighbors in both types of interfaces.

NEW QUESTION # 21
A routing domain is using a single-area link-state routing protocol. Which of the following is NOT information that a router can share with other routers in the domain using protocol-specific messages?

• A. IP prefixes known by the router because it is running ad additional routing protocol.
• B. A copy of the local routing table.
• C. The local router ID and the router IDs of neighboring routers.
• D. The IP prefixes of subnets directly attached to the router.

Answer: B

Explanation:
In a single-area link-state routing protocol (such as OSPF), routers share specific information about the network topology, not their entire routing table. They exchange link-state advertisements (LSAs) that contain information about their directly connected interfaces and their state, allowing other routers to build a consistent view of the network.

NEW QUESTION # 22
Refer to the exhibit.

In the IS-IS network shown, router R1 has been configured to summarize subnetworks 20.20.1.0/24 and 20.20.2.0/24 as 20.20.0.0/16. Which routers' routing tables will be reduced, compared to their routing tables before the summarization?

• A. Router R1
• B. Routers R2 and R4
• C. Routers R1 and R2
• D. Router R2

Answer: D

Explanation:
Router R1 is the one that performs the summarization of the two subnets (20.20.1.0/24 and 20.20.2.0/24) into the summarized route 20.20.0.0/16. However, R1 itself will not see any change in its routing table because it is directly connected to both subnets and already knows about them.
Router R2, which is in Area 49.0002, will benefit from this summarization because it previously had separate routes for both 20.20.1.0/24 and 20.20.2.0/24. After the summarization, R2 will only need to maintain a single route to 20.20.0.0/16, reducing the size of its routing table.
Router R4 does not directly benefit from the summarization because it is only connected to the Level 1 network and has no need for the summarized routes from R1. Thus, the summarization does not affect R4's routing table.

NEW QUESTION # 23
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 both routers R1 and R2.
• 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 router R2 but not on router R1.

Answer: A

Explanation:
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.

NEW QUESTION # 24
Which of the following is a valid alternative representation of the IPv6 address
2001:0da8:0000:0000:0024:0000:4ab9:0300?

• A. 2001:da8::24:0:4ab9:300
• B. 2001:0da8::0024:0000:4ab9:03
• C. 2001:da8::0:24::4ab9:300
• D. 2001:da8::24::4ab9:300

Answer: B

Explanation:
In IPv6, consecutive sections of zeros can be abbreviated with a double colon (::) once in an address. Also, leading zeros in each hextet (group of four hexadecimal digits) can be removed.
The original address is 2001:0da8:0000:0000:0024:0000:4ab9:0300.
Removing leading zeros and applying the abbreviation:

NEW QUESTION # 25
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 default route with router R3 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 route to router R6's system IP address with router R2 as the next-hop.
• D. Router R4 will have a default route with router R2 as the next-hop.

Answer: C

Explanation:
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.

NEW QUESTION # 26
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. Broadcast Hello messages identify the elected designed IS (DIS) and point-to-point Hello messages do not.
• 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. 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.

Answer: B

NEW QUESTION # 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

Answer: D

Explanation:
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.

NEW QUESTION # 28
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 Hello packet with the highest sequence number.
• B. The existing DIS remains the DIS.
• C. The router with the highest system ID.
• D. The router with the highest interface MAC address.

Answer: C

Explanation:
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.

NEW QUESTION # 29
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. The echo request arrives at the server but there is no path for the echo response to return to router R1.
• C. Router R2 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.
• D. Router R3 drops the echo request because it does not have subnet 10.4.100.0/24 in its routing table.

Answer: B

Explanation:
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.

NEW QUESTION # 30
Two IS-IS neighboring routers are trying to establish an adjacency, but the interface has been configured as broadcast on one of them and as point-to-point on the other. Why is the adjacency not established?

• A. The routers do not receive each other's Hello messages because they listen for messages transmitted to different multicast MAC addresses.
• B. The routers do not receive each other's Hello messages because they listen for messages transmitted to different multicast IP addresses.
• C. The routers discard the received Hello messages because they are not the expected type: LAN Hello vs point-to-point Hello.
• D. The routers do not agree on the result of the DIS election.

Answer: C

Explanation:
IS-IS routers use different types of Hello messages depending on whether the interface is configured as a broadcast (LAN) or point-to-point (P2P) link.
On a broadcast network (e.g., Ethernet), IS-IS routers use LAN Hello packets to establish adjacencies.
On a point-to-point link, IS-IS uses point-to-point Hello packets.
If one router is configured for a broadcast interface and the other for point-to-point, they will exchange incompatible Hello packets, and as a result, neither router will accept the other's Hello messages, preventing the adjacency from being established.

NEW QUESTION # 31
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)

Answer: A

Explanation:
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.

NEW QUESTION # 32
Which of the following statements about router interfaces on a Nokia 7750 SR is FALSE?

• A. The system interface exists by default.
• B. They can be logical or physical.
• C. They can be assigned IPv4 and/or IPv6 addresses.
• D. They can be used in pairs on the same subnet for redundancy.

Answer: D

Explanation:
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.

NEW QUESTION # 33
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 sends back a copy of the LSP from its database to its neighbor.
• B. The router updated its database with the LSP, acknowledges the LSP with a PSNP, and floods a copy to its neighbors on other interfaces.
• C. The router updates its database with the LSP and acknowledges it with a PSNP.
• D. The router updates its database with the LSP and floods a copy to its neighbors on other interfaces.

Answer: B

Explanation:
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.

NEW QUESTION # 34
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Nokia 4A0-112 exam is a certification exam that is aimed at professionals who are responsible for designing, configuring, and troubleshooting network infrastructures that use the IS-IS protocol. 4A0-112 exam covers a range of topics, including the design and architecture of the IS-IS protocol, its operation and maintenance, and its integration with other protocols and technologies.

 

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