Which statement accurately describes the purpose of a MAC address in a local area network?

It identifies a device's location on the internet for routing purposes.

It is a logical address assigned by the network administrator to identify a device on a subnetwork.

It is a globally unique, 48-bit hardware identifier used for communication within a broadcast domain.

It is a 32-bit address that changes each time a device connects to a different network.

A network administrator is troubleshooting a connectivity issue between two IPv6 hosts on the same link. Host A cannot ping Host B, but Host A can ping its own link-local address. Host A's neighbor cache shows no entry for Host B. What is the most likely cause?

Host A has a misconfigured global unicast address

Host B is not responding to Neighbor Solicitation messages

Host A is using a link-local address to ping Host B

The router is not advertising the prefix

A network administrator is troubleshooting why a host cannot reach a server on a different subnet. The host's ARP cache shows the MAC address of the default gateway. What does this indicate?

The host is using proxy ARP to reach the server

The host has resolved the server's MAC address and is sending frames directly

The host has a misconfigured subnet mask

The host has successfully resolved the gateway's MAC and will send the packet to the gateway for routing

What is the hexadecimal format of a standard 48-bit MAC address?

A string of 12 hexadecimal digits, often grouped in pairs, such as 00:1b:63:84:5e:2f

A string of 16 hexadecimal digits, such as 2001:0db8:85a3:0000:0000:8a2e:0370:7334

A string of 10 decimal digits, such as 192.168.1.1

A string of 8 hexadecimal digits, such as 192.168.1.1

What is the purpose of a logical address, such as an IPv4 or IPv6 address, in a network?

It is a temporary address that is only valid for the duration of a single session.

It provides a physical identifier burned into the network interface card.

It is used only for local communication within a single broadcast domain.

It is used to identify a device's location on the network and enable routing between different networks.

Juniper NetworksCertified Associate, Junos

Domain 1Objective 4

Layer 2 and Layer 3 Addressing JN0-105 Practice Questions (Page 3)

Part of the Networking Fundamentals domain, which makes up ~24% of our current practice bank. Juniper Networks does not publish an official question count, but from its 90-minute exam (~35–60 total, ~8–14 in this domain), expect 1–1 from this objective — we provide 21 practice questions to prepare you well beyond it. (estimate)

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Questions 11–15

11foundation · easy
Which statement accurately describes the purpose of a MAC address in a local area network?
Select an answer first
12expert · hard
A network administrator is troubleshooting a connectivity issue between two IPv6 hosts on the same link. Host A cannot ping Host B, but Host A can ping its own link-local address. Host A's neighbor cache shows no entry for Host B. What is the most likely cause?
Select an answer first
13application · medium
A network administrator is troubleshooting why a host cannot reach a server on a different subnet. The host's ARP cache shows the MAC address of the default gateway. What does this indicate?
Select an answer first
14foundation · easy
What is the hexadecimal format of a standard 48-bit MAC address?
Select an answer first
15foundation · easy
What is the purpose of a logical address, such as an IPv4 or IPv6 address, in a network?
Select an answer first

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