Ping uses which Internet layer protocol?
A.) RARP B.) ICMP C.) ARP D.) FTP Ans B Internet Control Message Protocol – ICMP is a management protocol and messaging service provider for IP. Its messages are carried as IP datagrams. ICMP is used in the following events: Destination Unreachable – If a router cannot send an IP packet any further, it uses an ICMP echo to send a message back to the sender notifying it that the remote node is unreachable. Buffer Full – If a routers memory buffer is full ICMP will send out a message to the originator. Hops – Each IP datagram is assigned a path. This consists of hops. If it goes through the maximum number of hops, the packet is discarded and the discarding router sends an ICMP echo to the host. Ping – Ping use ICMP echo message to check connectivity.
