Digital Communications Subcategories

Osi Model Security 1	Protocols
And Network Synchronization	Optical Switching Networks

The time required to transmit frame depends on

A. Frame size
B. Channel capacity
C. Frame size & channel capacity
D. None of the mentioned

Explanation: The time to transmit frame is given by the ratio of frame size and channel capacity.

Window given the number of

A. Bytes
B. Frames
C. Bytes & frames
D. None of the mentioned

Explanation: Window gives the number of frames or bytes that can be in transit unacknowledged.

Routing is

A. Static
B. Dynamic
C. Static & dynamic
D. None of the mentioned

Explanation: Routing can be static and dynamic.

Routing is performed only centrally.

A. True
B. False
C.
D.

Explanation: Routing is performed centrally and also in fully distributed way.

Which is connection oriented and which is connection-less?

A. Datagrams, virtual circuits
B. Virtual circuits, datagrams
C. Datagrams
D. None of the mentioned

Explanation: Datagram is connection-less and virtual circuits are connection oriented.

Which uses UDP?

A. Echo
B. Time
C. Domain name server
D. All of the mentioned

Explanation: The protocols using UDP are echo, time, domain name server, network file system etc.

Which uses TCP?

A. Simple mail transfer protocol
B. Simple network management protocol
C. Simple mail transfer & network management protocol
D. None of the mentioned

Explanation: Some of the protocols using TCP are http, telnet, file transfer protocol, simple mail transfer protocol etc.

Which tells about low level transmission and framing?

A. V series
B. X series
C. G series
D. Q series

Explanation: G series tells about level transmission, modulation and framing.

Which tells about signalling?

A. V series
B. X series
C. G series
D. Q series

Explanation: Q series tells about signalling.