CompTIA Network+ Practice Test

What protocol replaces ARP in IPv6 for Neighbor Discovery?

1. ICMPv4

2. RARP

3. ICMPv6

4. TCP

The correct answer is: ICMPv6

In IPv6, the Address Resolution Protocol (ARP) is replaced by a more comprehensive suite of functions known as Neighbor Discovery, which utilizes ICMPv6 (Internet Control Message Protocol for IPv6). ICMPv6 is essential for various operations in IPv6 networking, including the discovery of other network nodes, determining their link-layer addresses, and maintaining reachability information about the neighboring nodes. The transition from ARP to ICMPv6 encompasses more than just address resolution; it includes functionalities for neighbor solicitation, neighbor advertisement, and router discovery, making ICMPv6 a critical protocol in managing and maintaining network communications in an IPv6 environment. This advancement simplifies network communication and enhances efficiency, allowing devices to dynamically discover and interact with hosts and routers on the same network segment. In the context of other options, ICMPv4 is a separate protocol used for IPv4 networks and does not apply to IPv6. RARP (Reverse Address Resolution Protocol) is also outdated and not directly relevant in this context, as it serves a different purpose related to address resolution in IPv4. TCP (Transmission Control Protocol) is a transport layer protocol and does not deal with address resolution or neighbor discovery. All these elements reinforce why ICMPv6 is the correct