Address Resolution Protocol and ICMPv6 Overview

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Questions and Answers

Which protocol is used by IPv6 for address resolution?

DHCPv6

ICMPv6 (correct)

ARP

RARP

What is the primary function of the Address Resolution Protocol (ARP)?

To resolve an IPv4 address to a MAC address (correct)

To monitor network traffic

To route packets between networks

To assign IP addresses

What type of Ethernet and IPv6 multicast addresses are used to send ICMPv6 Neighbor Solicitation messages?

Broadcast addresses

Unicast addresses

Special Ethernet and IPv6 multicast addresses (correct)

Anycast addresses

Which layer of the OSI model does ARP operate at?

Data Link layer Signup and view all the answers

What type of address does ARP resolve?

A mapping of IP address to MAC address Signup and view all the answers

Which of the following commands displays the current ARP cache on a Windows machine?

arp -a Signup and view all the answers

Who can remove ARP table entries manually?

Only the network administrator Signup and view all the answers

What happens to ARP entries in the ARP table after a specified period of time?

They are removed when an ARP cache timer expires Signup and view all the answers

What is the purpose of ICMPv6 Neighbor Solicitation (NS) messages in IPv6 Neighbor Discovery?

Address resolution Signup and view all the answers

What is a mitigation technique used by enterprise-level switches to protect against ARP attacks?

ARP filtering Signup and view all the answers

How do IPv6 devices resolve the MAC address of a known IPv6 address?

Using ICMPv6 Neighbor Solicitation (NS) messages Signup and view all the answers

What type of messages are used by routers for better next-hop selection in IPv6 Neighbor Discovery?

ICMPv6 redirect messages Signup and view all the answers

What can be a result of excessive ARP broadcasts on a local network?

Some reduction in performance Signup and view all the answers

In what scenario would a device use a gratuitous ARP?

To inform the network of its IP-MAC mapping without being asked Signup and view all the answers

What is a potential security risk associated with ARP replies?

ARP spoofing Signup and view all the answers

What is the purpose of ICMPv6 Router Solicitation (RS) and Router Advertisement (RA) messages?

Router discovery Signup and view all the answers

What happens to ARP entries in the cache after a timeout period?

They are deleted from the cache Signup and view all the answers

What is a common security risk associated with ARP?

ARP poisoning Signup and view all the answers

What is the primary function of ARP in a network?

To resolve an IPv4 address to a MAC address Signup and view all the answers

What type of messages are used for device-to-device messaging in IPv6 Neighbor Discovery?

ICMPv6 Neighbor Solicitation (NS) and Neighbor Advertisement (NA) Signup and view all the answers

What is the role of the default gateway in the context of ARP?

It forwards packets between different networks Signup and view all the answers

What happens when a device searches its ARP table for a destination IPv4 address?

It checks the ARP table for the IPv4 address and its corresponding MAC address Signup and view all the answers

When a device sends an ARP request, the request is sent as:

Broadcast Signup and view all the answers

What is the primary function of the IPv6 Neighbor Discovery (ND) protocol?

Address resolution Signup and view all the answers

Which command displays the ARP table on a Cisco router?

show ip arp Signup and view all the answers

Study Notes

Address Resolution Protocol (ARP)

ARP's primary function is to translate an IPv4 address to a corresponding MAC address
IPv6 uses ICMPv6 for address resolution
Special Ethernet and IPv6 multicast addresses are used for ICMPv6 Neighbor Solicitation messages
ARP operates at the Data Link layer of the OSI model
ARP resolves IP addresses to their corresponding MAC addresses
ARP table entries expire after a specified period
Network administrators can manually remove ARP table entries
ARP spoofing is a security risk associated with ARP replies

ICMPv6 Neighbor Discovery (ND)

ICMPv6 NS and NA messages are used for device-to-device messaging in IPv6 Neighbor Discovery
ICMPv6 RS and RA messages are used for router discovery
IPv6 Neighbor Discovery is used to resolve MAC addresses
Excessive ARP broadcasts can lead to performance degradation in a network

ARP Table

ARP tables store mappings of IPv4 addresses to MAC addresses
ARP table entries are deleted after a timeout period
The arp -a command displays the current ARP cache on a Windows machine
The show ip arp command displays the ARP table on a Cisco router

Default Gateway

The default gateway forwards packets between different networks
The default gateway resolves IP addresses for local devices

IPv6 Address Resolution

IPv6 devices use ICMPv6 Router Solicitation (RS) and Router Advertisement (RA) messages to resolve MAC addresses
IPv6 uses ICMPv6 Neighbor Solicitation (NS) messages to obtain the MAC address of a known IPv6 address

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Description

Explore the vital roles of the Address Resolution Protocol (ARP) and ICMPv6 Neighbor Discovery in network communication. This quiz covers the translation of IPv4 addresses to MAC addresses and how IPv6 utilizes ICMPv6 for similar functions. Learn about ARP table management, security risks like ARP spoofing, and the implications of excessive ARP broadcasts on network performance.