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Nokia 4A0-112 Exam Questions
- Topic 1: IP Routing Review: This section measures the skills of Network Engineers and covers the fundamentals of IP routing. Candidates will learn about the basics of IP routing, how to populate the routing table and the concept of Equal-Cost Multipath Routing (ECMP). The module also discusses route redistribution and filtering using policies, as well as the architecture of the Nokia 7750 SR. Additionally, candidates will understand the IP packet header format, IP addressing, and Layer-3 interfaces on a Nokia 7750 SR.
- Topic 2: Static Routes: In this section, the exam focuses on Network Engineers and defines the characteristics of static routes. Candidates will learn about failure detection options associated with static routes and will also explore IPv6 static routes. Understanding these concepts is crucial for effective network management.
- Topic 3: Interior Gateway Protocols: This section is aimed at Network Analysts and provides an overview of interior gateway protocols. Candidates will study distance vectors, link-state protocols, and the shortest path first algorithm. The module also covers link-state protocol message flooding and optimizations, which are essential for efficient routing within networks.
- Topic 4: Intermediate System-to-Intermediate System Routing Protocol (IS-IS): Targeted at IS-IS Network Engineers, this section covers the basics of IS-IS. Candidates will learn about hierarchy in a multi-area IS-IS domain, IS-IS message types, adjacency formation, and database synchronization. The module also includes advertising link-state information in single-area and multi-area IS-IS networks, route leaking, summarization, and advertising external prefixes into IS-IS.
Free Nokia 4A0-112 Exam Actual Questions
Note: Premium Questions for 4A0-112 were last updated On Apr. 21, 2025 (see below)
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?
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.
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?
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.
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?
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.
Which of the following statements about the IP forwarding process on a router is TRUE?
During the IP forwarding process, routers use the routing table to determine the next hop based on the destination IP address. The source IP address is not directly involved in the lookup process for forwarding.
The ARP table is used to map IP addresses to MAC addresses, specifically for resolving the MAC address of the next hop (destination MAC address) for forwarding packets within the local network.
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?
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.
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