Basic Networking Concepts Question:

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What is Protocol Data Unit?

Basic Networking Interview Question
Basic Networking Interview Question

Answer:

The data unit in the LLC level is called the protocol data unit (PDU). The PDU contains of four fields a destination service access point (DSAP), a source service access point (SSAP), a control field and an information field. DSAP, SSAP are addresses used by the LLC to identify the protocol stacks on the receiving and sending machines that are generating and using the data. The control field specifies whether the PDU frame is a information frame (I - frame) or a supervisory frame (S - frame) or a unnumbered frame (U - frame).

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What is attenuation? What are the data units at different layers of the TCP / IP protocol suite?