CS 345 – Data Communications
Study Guide and Review Questions for Exam #1
Exam: Wednesday, March 1, 2006
DEFINITIONS: (Please define and EXPLAIN
the following terms in your own words. DO NOT cut and paste from the NET)
·
De facto
standards
·
De jure
standards
·
Proprietary
standards
·
ISO
·
ANSI
·
IEEE
·
OSI
·
TCP/IP
·
LAN
·
WAN
·
MAN
·
Encoding
·
Bit
·
Byte
·
RFC
·
Simplex
·
Half-duplex
·
Full-duplex
·
Bus
·
Star
·
Ring
·
Connectionless protocols
·
Connection-oriented protocols
·
Kilobyte
·
Megabyte
·
Analog Signal
·
Clock drift
·
Baseline Wander
·
PPM
·
PAM
·
PDM
·
PCM
·
ASK
·
PSK
·
FSK
·
QAM
·
Sampling
·
Character encoding
·
ASCII
·
EBCDIC
·
Unicode
ESSAY:
1.What
are standards? Describe the three kinds of standards and give examples of each.
2.List
the basic parts of a LAN. Briefly
describe the function and responsibility of each part.
3.What
is the OSI model? Why is it useful?
What are the two sub-layers of the data-link layer?
4.What
is TCP/IP? List the protocols within this suite’s 4 layers. How does it
correspond to the OSI model?
5.Draw
an Ethernet frame.
6.Identify
5 causes of analog and digital transmission errors.
7.Describe
the three central network topologies and the advantages and disadvantages of
each.
8.Compare
and contrast connectionless transmissions to connection-oriented.
9.If
I want to transmit some data from my home over a dial-up connection what device
do I need? How does it work?
10.Describe
the three ways that an analog signal can be altered or modulated. Provide a
diagram of each example.
11.What
is a Hertz (Hz)? A Kilohertz (KHz)?
12.What
is a composite signal?
13.How
do we measure digital signals?
14.What
device is responsible for encoding and decoding digital signals? What is encoding? List the three categories of encoding schemes.
15.Be
able to encode a byte using the following:
·
Unipolar
·
NRZ
·
NRZI
·
RZ
·
Differential
·
4B/5B
·
AMI
16.What
two problems have evolving encoding schemes tried to solve? What causes these two problems?
17.What
is sampling and why is it used?
18.What
is the Nyquist theorem?
19.Which determines the bandwidth required for a
transmission, bauds or bits?
20.A carrier wave between two modems can be modulated
in what 4 different ways?
21What is the primary responsibility of guided and
unguided media?
23.All networks can be characterized
in what 3 ways?