Key Terms

Review the following list of key terms:

  • Address Resolution Protocol (ARP)— A key Internet layer protocol used to obtain the physical address associated with an IP address. ARP maintains a cache of recently resolved physical-address-to-IP-address pairs.

  • Class A, B, C, D, and E— A classification system for IP addresses. The network class determines how the address is subdivided into a network ID and host ID.

  • host ID— A portion of the IP address that refers to a node on the network. Each node within a network should have an IP address that contains a unique host ID.

  • Internet Control Message Protocol (ICMP)— A key Internet layer protocol used by routers to send messages that inform the source IP of routing problems. Also used by the

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