Instructor
:
Seung Bae Im
MIDTERM EXAM ----- Spring
2004
Closed
book, closed notes. Write neatly.
Name :
_____________________________
1.(28 points) Describe the following terms and
answer the questions.
(a) Peer-to-peer layer
virtual communications
(b) nth
layer protocol
(c) Network
protocol architecture, also give an example.
(d) State why the
OSI Model is important?
(e) Discuss the
overlap of functions between ISO and ITU-T and also discuss how they cooperate.
(f) Discuss the
role of IEEE in the arena of network standards.
(g) Discuss how
“Internet” standards are established.
2.(6 points) State the reasons why TCP/IP protocol
suite is dominant(used almost everywhere, used on almost every machine) over all other
protocols including OSI protocols. Include the terms: ARPANET, BSD
3.(20 points) Describe/discuss
(a) Define “Signal
bandwidth” and “Channel bandwidth”.
Also
discuss the relationships between the two.
(b) Discuss how/why
a telephone voice channel bandwidth is limited to 300Hz – 3400Hz.
(c) What is
“Crosstalk”?
(d) Discuss the
significance of
4.(20 Points) Answer the questions.
(a)
Describe how “multibit modulation”
works.
(b)
What is ISM(Industrial, Scientific, Medical) band?
(c)
State why 4B/5B code is more efficient than
(d) Describe the
“Fourier Theorem”.
5.(10 points) Show a
diagram which illustrates how T-1 carrier multiplexes 24 digitized voices.
Also, show the calculation to derive its data rate of 1.544 Mbps. In the
calculation, clearly mark each component.
6.(16 points) Discuss/describe
(a) Draw the
protocol diagram(showing layers and sublayers) for the
LAN protocols—Show IEEE 802.2, 802.3, 802.5.
Also clearly show the Physical, MAC and LLC layers on the diagram. Also
discuss why IEEE divided the Data Link layer into sublayers.
(b) Describer how
the 4B/5B code works and compare
(c)
State
main reasons why Ethernet is dominating over other LAN technologies.