IP Protocol PDF

Explain What is the PDU of "Network layer" and "Data link layer"?

PDU for Network Layer is: "Packet" and PDU for Data Link Layer is :"Frame"

128 bit in tcp ip

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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.?	Explain How do applications coexist over TCP and UDP?