1. You are sending a bottle of fine tap water from New Albany to a friend in Salem.
a) (5 pts) Complete the following diagram by labeling the rectangles and large arrows using the listed item letters to show how peers at each horizontal level view the bottle delivery process. You and friend rectangles have been completed.
a) friend's mailbox b) transportation
c) your mailbox d) Salem post office
e) New Albany post office
f) bottle
g) package
h) Highway 60
b) (6 pts) Label the following arrows and rectangles using
the listed item letters.
i) Application layer
j) Physical layer
k) Transport layer
l) Application Protocol
m) Physical Protocol n) Transport Protocol
c) (2 pts) Add the labels virtual and real to the diagram arrows to indicate the type of communication path.
2. (2 pts) An alternative to a LAN is simply to have everyone connect to one large, central computer. Give two advantages of a client-server system using a LAN over a single, central machine.
a)
b)
3. (1 pt) What is the principal difference between
connectionless communication and connection-oriented communication?
4. (2 pts) Two networks each provide reliable connection-oriented service. One of them offers a reliable byte stream and the other offers a reliable message stream.
a) Are these identical?
b) If so, why is a distinction made? If not, give an
example of how they differ.
5. (3 pts) Match the following examples of communication transfer with the most appropriate.
__ Phone __ AM radio __ CB radio
a) simplex b)
half-duplex c)
full-duplex
6. ( 2 pts) Give two reasons for using layered protocols.
a)
b)
7. (2 pts) A system has an n layer protocol hierarchy. Applications generate messages of length M bytes. At each of the layers, an h byte header is added as the message moves through lower layers.
a) What is the total size in bytes of header?
b) What fraction of the network bandwidth is filled
with the headers?
8. (2 points) Give an advantage and a disadvantage of frame relay over a leased line.
Advantage:
Disadvantage:
9. (1 pt) Give one reason why ATM uses small, fixed length cells?
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