Core Protocols
The primary protocols in the internet layer are the Internet protocol (IP). It is implemented in two versions, IPv4 and IPv6. The Internet Control Message Protocol (ICMP) is primarily used for error and diagnostic functions. Different implementations exist for IPv4 and IPv6. The Internet Group Management Protocol (IGMP) is used by IPv4 hosts and adjacent multicast routers to establish multicast group memberships.
Read more about this topic: Internet Layer
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