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Which of the following technologies has been developed …

Which of the following technologies has been developed to support TCP/IP networking over low-speed serial
interfaces?

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A.
ISDN

B.
SLIP

C.
xDSL

D.
T1

Explanation:
Serial Line Internet Protocol (SLIP) is an older technology developed to support TCP/IP communications over
asynchronous serial connections, such as serial cables or modem dial – up.
Incorrect Answers:
A: ISDN can be considered a suite of digital services existing on layers 1, 2, and 3 of the OSI model. ISDN is
digital, not serial.
C: xDSL is a digital technology. xDSL is the term for the Broadband Access technologies based on Digital
Subscriber Line (DSL) technology
D: The T1 carrier is the most commonly used digital, not serial, transmission service.

Stewart, James M., Ed Tittel, and Mike Chapple, CISSP: Certified Information Systems Security Professional
Study Guide, 5th Edition, Sybex, Indianapolis, 2011, p. 138


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