QUESTION 1

Name one important difference between 4G LTE and 3G

		In 4G LTE all communication is IP-based, but in 3G it is not
		3G uses tunneling and 4G LTE does not
		3G does not support cellular mobility, but 4G LTE does

10 points

QUESTION 2

To which of the following layer does the 802.11 protocol correspond?

		Data Link layer
		Transport layer
		Network layer

10 points

QUESTION 3

How does CDMA allow multiple senders to communicate over a shared channel without interference?

		By multiplying the signal by a special code
		By using Frequency Division Multiplexing (FDM)
		By using collision detection

10 points

QUESTION 4

The token bucket technique plus the Weighted Fair Queuing link discipline can guarantee the requested Quality of Service for all flows in the network.

True

False

10 points

QUESTION 5

The RTP protocol describes how packets are transferred to ensure they are received in order

True

False

10 points

QUESTION 6

What is the purpose of interleaving units of audio data during a transmission?

		Avoid large gaps in the received stream when a packet is lost
		Reduce the amount of data sent on an audio stream
		Reconstruct the exact original stream even if packets are lost

10 points

QUESTION 7

Which of the following assertions are true regarding wireless mobility?

		The direct routing approach removes the triangle routing problem of indirect routing
		In indirect routing, the correspondent needs to implement an additional mobile-user location protocol in order to find a mobile node
		In indirect routing, the sender needs to contact a mobile receiver through a home agent

10 points

QUESTION 8

Which of the following assertions is true regarding the token bucket (or leaky bucket) technique?

		A token bucket with a token generation rate of r tokens per second will allow a burst transmission of r packets at most.
		A token bucket provides different Quality of Service to a flow of packets depending on the packets' traffic class.
		A token bucket with a maximum capacity of b will allow a burst transmission of b packets at most.

10 points

QUESTION 9

A difference between a wireless Access Point and a data-link layer switch is the Access Point has a MAC address but a switch does not.

True

False

10 points

QUESTION 10

What is the purpose of prefetching in server-stored multimedia streaming?

		To consume less bandwidth during the transmission
		To mitigate variable network delays in the transmission
		To provide real-time communication