provides communication between the Internet Protocol Software on one machine and the Internet Protocol Software on another
reports error conditions to the original source, the source must relate errors to individual application programs and take action to correct the problem
None of these
All of these
allows gateways to send error a control messages to other gateways or hosts
Packets are delivered to all interfaces identified by the address. This is also called one-to-many addresses.
This address identifies multiple interfaces and the anycast packet is only delivered to one address. This address can also be called one-to-one-of-many.
These addresses are meant for nonrouting purposes, but they are almost globally unique so it is unlikely they will have an address overlap.
Packets addressed to a unicast address are delivered to a single interface.
EXAMIANS