1. How
many OSI layers are covered in the X.25 standard?
(A) Two (B)
Three
(C) Seven (D)
Six
Answer: B
2. Layer
one of the OSI model is .................
(A) physical layer (B) link layer
(C) transport layer (D) internet work layer
Answer: A
3. The
X.25 standard specifies a ...............
(A) technique for start-stop data
(B) technique for dial access
(C) DTE/DCE interface
(D) None of above
Answer: C
4. Which
of the following communication modes support two-way traffic but in only one
direction at a time?
(A) simplex (B)
half duplex
(C) three-quarters duplex (D) all of the above
Answer: B
5. Which
of the following might be used by a company to satisfy its growing
communications needs?
(A) front end processor (B) multiplexer
(C) controller (D) All of the above
Answer: D
6. What
is the number of separate protocol layers at the serial interface gateway
specified by the X.25 standard?
(A) 4 (B)
2
(C) 6 (D)
3
Answer: D
7. The
interactive transmission of data within a time sharing system may be best
suited to
(A) simplex lines (B) half-duplex lines
(C) full duplex lines (D) None of these
Answer: B
8. Which
of the following is considered a broad band communication channel?
(A) coaxial cable (B) fiber optics cable
(C) microwave circuits (D) all of the above
Answer: D
9. Which
of the following is not a transmission medium?
(A) telephone lines (B) coaxial cables
(C) modem (D)
microwave systems
Answer: C
10. Which
of the following does not allow multiple uses or devices to share one communication
line?
(A) doubleplexer (B) multiplexer
(C) concentrator (D) controller
Answer: A
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