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4A0-100 Pack
Vendor: Nokia
Exam Code: 4A0-100
Exam Name: Nokia IP Networks and Services Fundamentals
Exam Questions: 40
Last Updated: June 27, 2026
Related Certifications: Nokia Network Routing Specialist I, Nokia Network Routing Specialist II, Nokia Service Routing Architect, Nokia Triple Play Routing Professional
Exam Tags: Network Routing Entry Level Data Center ServicesMedia Network EngineerNetwork and Communications Services Specialist
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Free Nokia 4A0-100 Exam Actual Questions

Question No. 1

Which of the following is a characteristic of Link State protocols?

Show Answer Hide Answer
Correct Answer: C

Link-State routing protocols (e.g., OSPF, IS-IS) operate by:

Each router flooding link-state advertisements (LSAs) throughout the network.

Every router constructs a complete map of the network topology.

Then each router runs the SPF algorithm to compute optimal paths.

Option C is correct -- routers know the entire network topology.

Option A is Distance Vector behavior (e.g., RIP).

Option B is not efficient or accurate for Link-State.

Option D -- hop-count is used in Distance Vector (e.g., RIP).


Nokia SRA Study Guide -- Chapter: ''OSPF and IS-IS Concepts''

RFC 2328 -- OSPF Link-State Overview

Question No. 2

In MAC address 00-20-60-CE-2B-28, which part is the Organisationally Unique Identifier (OUI)?

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Correct Answer: D

A MAC address (Media Access Control address) is a 48-bit identifier typically expressed in six groups of two hexadecimal digits (e.g., 00-20-60-CE-2B-28). It consists of two key parts:

OUI (Organizationally Unique Identifier) -- The first 24 bits (or first 3 octets, e.g., 00-20-60) are assigned by the IEEE to hardware manufacturers. This identifies the vendor or manufacturer.

Device Identifier (NIC Specific) -- The remaining 24 bits (e.g., CE-2B-28) are assigned uniquely by the vendor to each device/interface.

So in the address 00-20-60-CE-2B-28:

00-20-60 is the OUI

CE-2B-28 is the device-specific portion

Thus, the correct answer is D. 00-20-60.


IEEE MAC Address Standard (IEEE 802)

Nokia IP Networking Fundamentals Study Guide -- Chapter: 'Ethernet Addressing'

Question No. 3

Which of the following statements about the system interface on the Nokia 7750 SR is FALSE?

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Correct Answer: B

The system interface in Nokia SR OS is a loopback-style logical interface that represents the router itself. It is used for:

Router ID assignment (if not manually set)

Source IP for control-plane protocols (OSPF, BGP)

Reachability testing

Important properties:

It is type loopback

It exists by default

If router ID is unset, it uses the system IP address

But the IP address on the system interface does not need to be /32

It can have other prefix lengths, especially in service provider scenarios.

Thus, Option B is FALSE.


Nokia SRA Study Guide -- Chapter: 'System Interface and Loopbacks'

Nokia SR OS Fundamentals Guide -- System IP Configuration Section

Question No. 4

Which of the following statements about MD-CLI is FALSE?

A. It allows atomic transactions. B. Configuration changes are activated when the running configuration datastore is saved to a file. C. To achieve transactional configuration, it is necessary to have multiple configuration datastores. D. Multiple users may enter the global configuration mode concurrently.

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Correct Answer: B

The Model-Driven Command Line Interface (MD-CLI) in Nokia SR OS provides a structured and programmatic way to manage configurations. It is based on a transactional model, meaning changes are made in a candidate configuration before being committed to the running configuration.

Let's review each statement:


Nokia SR OS MD-CLI User Guide

Nokia SRA Study Guide -- Chapter: 'Model-Driven Configuration and Transactions'

Question No. 5

Which of the following statements about the IP forwarding process on a router is TRUE?

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Correct Answer: B

When a router forwards a packet, it performs the following operations:

Looks up the destination IP address in the routing table to determine the next hop or egress interface.

Uses the ARP table to resolve the MAC address of the next-hop IP.

Option A is incorrect -- source IP is not used for route lookup.

Option C is incorrect -- routers don't resolve the source MAC.

Option D is partially true, but routing begins with the routing table, making B the most accurate.


Nokia IP Fundamentals Study Guide -- Chapter: ''IP Packet Forwarding''

RFC 1812 -- Requirements for IP Routers

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