11. X.25 is a :
(a) Protocol
(b) Technology
(c) Data service
(d) Telephone service
12. X.25 protocol was recommended by CCITT in :
(a) 1975
(b) 1976
(c) 1977
(d) 1978
13. X.25 protocol exchanged the data control information between :
(a) A node
(b) A user device
(c) Both a & b
(d) None of these
14. The channel grouping in X.25 are known as :
(a) Logical channel number(LCN)
(b) Logical channel group number(LCGN)
(c) Both a & b
(d) None of these
15. Maximum packet sizes in X.25 vary from :
(a) 32 bytes to 64 bytes
(b) 64 bytes to 128 bytes
(c) 64 bytes to 2056 bytes
(d) 64 bytes to 4096 bytes
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- X.25 Protocol » Exercise - 13. 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.
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