"Computer Networking: A Top-Down Approach"

1. [3 points] What are the dierences between the following types of wireless channel impairments- \path

loss", \multipath propagation" and \interference" from other sources?

1. [4 points] What are the dierences between a master device in a bluetooth network and base station in

802.11 network?

1. [3 points] If a node has a wireless connection to the Internet, does that node have to be mobile? Suppose

that a user with a laptop walks around her house with her laptop, and always accesses the Internet

through the same access point. Is the user mobile from a network standpoint? Explain.

1. [3 points] What are the purposes of the HLR and VLR in GSM networks? What elements of mobile IP

are similar to the HLR and VLR?

1. [5 points] What feature in 3G and 4G network made them popular in terms of massive user and connected

devices? What are the roles EPC in 4G architecture?

1. [2 points] Why is a packet that is received after its scheduled playout time considered lost?

Sample Solution