Monday, April 14, 2014

Easter homework

Just to keep you busy during the holidays. Homework is due May, 2nd.


  1. What are some of the possible services that a link-layer protocol can offer to the network layer?  Which of these link-layer services have corresponding services in IP? In TCP?
  2. Suppose two nodes start to transmit at the same time a packet of length L over a broadcast channel of rate R. Denote the propagation delay between the two nodes as dprop. Will there be a collision if dprop < L/R? Why or why not?
  3. Why is an ARP query sent within a broadcast frame? Why is an ARP response sent within a frame with a specific destination MAC address?
  4. Explain what is the Exponential Binary Back-off algorithm used by Ethernet.
  5. Where can you find the 802.1Q VLAN tag in the Ethernet frame format?

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