1-5

What is the Internet? Which of the following descriptions below correspond to a "nuts-and-bolts" view of the Internet?

		A collection of hardware and software components executing protocols that define the format and the order of messages exchanged between two or more communicating entities, as well as the actions taken on the transmission and/or receipt of a message or other event.
		A platform for building network applications.
		A "network of networks".
		A collection of billions of computing devices, and packet switches interconnected by links.
		A place I go for information, entertainment, and to communicate with people.

1-6

Computing utilization . Consider the scenario shown below, with four different servers connected to four different clients over four three-hop paths. The four pairs share a common middle hop with a transmission capacity of R = 300 Mbps. The four links from the servers to the shared link have a transmission capacity of R_S = 50 Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of R_C = 90 Mbps.

Assuming that the servers are all sending at their maximum rate possible, what are the link utilizations of the client links (with transmission capacity R_C)? Enter your answer in a decimal form of 1.00 (if the utilization is 1) or 0.xx (if the utilization is less than 1, rounded to the closest xx).

Your answer: The utilization of client link is: [A]

1-7

Components of packet delay. Match the description of each component of packet delay to its name in the pull down list.

- a. b. c. d.	Time needed to perform an integrity check, lookup packet information in a local table and move the packet from an input link to an output link in a router.
- a. b. c. d.	Time spent waiting in packet buffers for link transmission.
- a. b. c. d.	Time spent transmitting packets bits into the link.
- a. b. c. d.	Time need for bits to physically propagate through the transmission medium from end one of a link to the other.

a.	Propagation delay
b.	Transmission delay
c.	Processing delay
d.	Queueing delay

1-8

The client-server paradigm. Which of the characteristics below are associated with a client-server approach to structuring network applications (as opposed to a P2P approach)?

		There is a server that is always on.
		A process requests service from those it contacts and will provide service to processes that contact it.
		There is not a server that is always on.
		There is a server with a well known server IP address.
		HTTP uses this application structure.