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CS403 Final Exam Review Questions And Answers 100% Verified. What are the basic characteristics of modern modems? - AnswersTransmission rates, standard telephone operations, connection negotiation, compression, error correction, facsimile transmission, security, loop-back testing, and internal ...

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  • December 23, 2024
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CS403 Final Exam Review Questions And
Answers 100% Verified.



What are the basic characteristics of modern modems? - Answers✔Transmission rates, standard
telephone operations, connection negotiation, compression, error correction, facsimile
transmission, security, loop-back testing, and internal versus external.
What is meant by fall forward and fallback negotiation? - Answers✔Can automatically
recalculate transfer speeds between modems.
Why is the modem for a laptop different than a modem for another type of computer? -
Answers✔Must be much smaller.

Why are the 56 Kbps modems faster than the older 33,600 bps modems? - Answers✔They use
digital signaling techniques.
Why don't the 56 Kbps modems transmit at 56 Kbps? - Answers✔Too much noise, lowered
power levels, and analog / digital conversions.
What are the alternatives to traditional modems? - Answers✔ISDN, DSL, cable modems.

What is the primary advantage of a modem pool? - Answers✔Can have fewer modems than one
per machine.
What is a DTE, and what is a DCE? - Answers✔(Data terminal equipment and data circuit-
terminating equipment ) is an end instrument that converts user information into signals or
reconverts received signals. These can also be called tail circuits. A DTE device communicates
with the data circuit-terminating equipment (DCE). The DTE/DCE classification was introduced
by IBM. As the full DTE name indicates this is a piece of device that ends a communication line,
whereas the DCE provides a path for communication.
What are the four components of an interface? - Answers✔Mechanical, electrical, functional,
procedural.
What three circuits are needed, at minimum, to create an EIA-232E connection? -
Answers✔Transmit, receive, ground
What are the primary differences between X.21 and EIA-232E? - Answers✔In X.21, a pin can
have multiple functions. In EIA-232F each pin has a single function.
1

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What is the significance of the Bell standards and the Hayes standards? - Answers✔They paved
the way for the first modem.
FireWire and USB are standards to interconnect what to what? - Answers✔Computers to
different peripheral devices.
What are the advantages of FireWire and Universal Serial Bus? - Answers✔Advanced, fast,
modern, can daisy-chain, can auto-configure (with aid from OS)
What are the primary differences between asynchronous connections and synchronous
connections? - Answers✔Asynchronous sends one character at a time with stop, start and parity
bit. Synchronous sends multiple characters at one time with beginning and ending flags, control,
address info, and cyclic checksum.
In asynchronous connections, what additional bits are added to a character to prepare it for
transfer? - Answers✔Start, stop, parity (optional)
In asynchronous connections, how many characters are placed into one frame? - Answers✔One.
What are the advantages and disadvantages of asynchronous communication? -
Answers✔Advantages: simple
Disadvantages: slow, inefficient, poor error checking
What is the basic block diagram of a synchronous frame? - Answers✔See Figure 4-16
What are the advantages and disadvantages of synchronous communication? -
Answers✔Advantages: fast efficient, good error checking.
Disadvantages: a little more complex
What is the difference between half duplex and full duplex communications? - Answers✔Half
duplex: both sides can talk but only one at a time: Full duplex: both sides can talk and at the
time.
What is the difference between a point-to-point connection and a multipoint connection? -
Answers✔Point-to-point: each terminal has its own connection to the mainframe; Multipoint:
terminals share a connection.
How does a mainframe computer ask a terminal to send it data? - Answers✔Poll.
If you install a 56 Kbps modem into your computer and dial into a remote network that only has
33,600 bps modems, is your modem useless? - Answers✔No, the 56K modem will fallback to
the appropriate speed.
You are in charge of a highly sensitive application which accepts requests and supplies
confidential data. You don't want unauthorized individuals to access the data. But you do want to
allow remote dial in using a modem. What security feature will allow an authorized remote user


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