Identify the fundamentals of using computers - mcsaclass.com

A+ Certification Training 2007 Exam

Identify the fundamentals of using computers

You are a trainee technician at Certkiller .com. The trainer gives you a piece of
RS-232-C cable, 25 feet long, as well as the following connectors:
1. A DB-9F and a DB-25M.
2. Two DB-9F connectors.
3. Two DB-25F connectors.
4. Two DB-15M connectors.
Of the connectors above, which could you use to construct a null modem cable?
(Choose all that apply)

A. 2 and 3
B. 3 only
C. 1 and 3
D. 2 and 4
E. 2 only
F. 1 and 2
G. 4 only
H. 2 and 4
I. 1 only
J. 3 and 4

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Answer: A

Explanation:
Two DB-9F or two DB-25F connectors can be attached to either end of a short piece of
RS-232-C cable to create a null modem cable, depending on which type of serial port
exists on the computer.
A null modem is short RS-232-C cable that connects two personal computers so that they
can communicate without the use of modems. The cable connects the two computers'
serial ports, and certain lines in the cable are crossed over so that the wires used for
sending data by one computer are used for receiving data by the other computer and vice
versa.
Reference:
David Groth and Dan Newland, A+ Complete Study Guide (2nd Edition), Sybex,
Alameda, CA, 2001, pp. 260.