Question: what is multiplexing? differentiate between frequency and time division multiplexing What are three important link layer services? Explain the problem of channel access (medium access

what is multiplexing? differentiate between frequency and time division multiplexing
What are three important link layer services? Explain the problem of channel access (medium access control)
Classify medium access control protocols.
What are the main functions of the network layer in the internet protocol stack?
What is the structure for Ethernet packet and WiF packet, respectively? What are the differences?

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