State of Kansas

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Interview Question

Network Technician II Interview Topeka, KS

What level of the osi model is the ping command in.

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Interview Answer

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The OSI Reference Model divides the task of communicating over a network into seven layers, application, presentation, session, transport, network, data-link and physical. The TCP, UDP and ICMP protocol are transport layers, whereas the IP protocol is network layer. Much of the IP traffic these days is TCP, a connection-oriented transport layer for the Internet. The TCP connection-oriented protocol provides a lot of services not provided by the IP layer, like ports, checksums, framing and sequencing packets. The UDP connectionless protocol on the other hand does not provide framing or sequencing of packets, but does provide minimal services like ports and checksums. ICMP is yet another step down from UDP and provides only a checksum service. ICMP is really a higher-level tap into the low-level IP-network.

Interview Candidate on Jul 1, 2009

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