题目详情

The Address Resolution Protocol (ARP) is developed to enable communications on an internetwork and performs a required function in IProuting. ARPlies in the(71)layer of the TCP/IP model, and allows computers to introduce each other across a network prior to communication. ARP finds the(72)address ofa host from its known(73)address.Before a device sends a datagram to another deviceit looks in its ARP cache to see if there is a MAC address and corresponding IP address for the(74)device.If there is no entry,the device sends a(75) message to every device on the network.Only the device with the matching IPaddress replies with a packet containing the MAC address for the device(except in the case of “proxy ARP”).