Q.21 how many bits per symbol are used in the Baudot code?
(A) 5
(B) 7
(C 8
(D) 9
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Q.22 While transmitting odd-parity coded symbols, the number of zeros in each symbol is….
(A) odd
(B) even
(C) unknown
(D) none of these
Q.23 Which of the following transmission systems provides the highest data rate to an individual device?
(A) Digital PBX
(B) Computer Bus
(C) LAN
(D) Voiceband modem
Q.24 One important characteristic of LAN is…
(A) parallel transmission
(B) low cast access for low bandwidth channel
(C) unlimited expansion
(D) application independent interfaces
Q.25 Which of the following is possible in a token passing bus network?
(A) Unlimited number of stations
(B) Unlimited distance
(C) In-service expansion
(D) Multiple time-division channels
Q.26 Which of the following is not a characteristic of the hub architecture of Arc net?
(A) Directionalized transmission
(B) Alternative routing
(C) Zero insertion loss amplifier
(D) RIM port isolation
Q.27 A group of packets from a source through an X.25 packet system to sink.
(A) arrive in the same order sent for VC, but not for PVC
(B) arrive in the same order sent for PVC, but not for VC
(C) arrive in the same order sent for both VC and PVC
(D) None of these
Q.28 How many OSI layers are covered in the X.25 standard?
(A) three
(B) four
(C) two
(D) seven
Q.29 A protocol is a rule governing a time sequence of events that must take place.
(A) between peers
(B) across an interface
(C) between non-peers
(D) none of these
Q.30 What is the number of separate protocol layers at the serial interface gateway specified by the X.25 standard?
(A) 2
(B) 3
(C) 4
(D) 7
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