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X.25 Protocol – 1 – 1

1. X.25 is an example of ________ network.

(a) ring based
(b) frame relay
(c) circuit switched
(d) packet switched

Answer
Answer : (d)

Explanation
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2. How many OSI layers are covered in the X.25 standard ?

(a) 1
(b) 2
(c) 3
(d) 4

Answer
Answer : (c)

Explanation
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3.  The CCITT Recommendation X.25 specifies ______ three layers of communications.

(a) Session, transport and network.
(b) Physical, data link and network.
(c) Data link, network and transport.
(d) Application, presentation and session.

Answer
Answer : (b)

Explanation
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4. The type of packet format supported by X.25 is/are :

(a) Data packet
(b) Control packet
(c) Both a & b
(d) None of these

Answer
Answer : (c)

Explanation
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5. Which of the following network access standard is used for connecting stations to a packet- switched network ?

(a) X.3
(b) X.21
(c) X.25
(d) X.75

Answer
Answer : (c)

Explanation
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