IP Protocol PDF

Explain What is the full form of OSI and TCP/IP model?

OSI - Open System Interconnection
TCP/IP - Transmission Control Protocol/ Internet Protocol

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Explain How can we detect that the other end of a TCP connection has crashed? Can we use "keepalives" for this?	Explain How many hosts can be on each network? Consider a fixed subnet partition of a class B network number that will accommodate at least 76 networks.?