Data Communication and Networking – Data link Protocols – Synchronous Protocols – Bit-Oriented Protocol MCQs

This set of Data communication and Networking Multiple Choice Questions and Answers (MCQs) focuses on “Data link Protocols – Synchronous protocols – Bit-Oriented Protocol MCQs”.
 

1
. Control information in a system using _______ protocol can be just one or a multiple number of bits
  • an asynchronous
  • a character-oriented
  • a bit-oriented
  • b and c
2
. _______ is the basis for all bit-oriented protocols in use today
  • SDLC
  • HDLC
  • PPP
  • LAP
3
. AN HDLC _______ station sends commands.
  • primary
  • secondary
  • combined
  • a and c
4
. AN HDLC _______ station sends responses
  • primary
  • secondary
  • combined
  • b and c
5
. AN HDLC _______ station sends both commands and responses
  • primary
  • secondary
  • combined
  • none of the above
6
. In a _______ configuration, an HDLC primary station and several secondary stations are connected
  • an unbalanced
  • a symmetrical
  • a balanced
  • an asymmetrical
7
. In an HDLC _______ configuration, the connected stations each consist of two logical stations (primary and secondary)
  • unbalanced
  • symmetrical
  • balanced
  • asymmetrical
8
. In an HDLC _______ configuration, both stations are of the combined type.
  • unbalanced
  • symmetrical
  • balanced
  • asymmetrical
9
. In an HDLC _______ configuration, a physical station can send both commands and responses
  • unbalanced
  • symmetrical
  • balanced
  • b and c
10
. In HDLC, the _______ describes which station has control of the link.
  • station type
  • configuration
  • mode of communication
  • any of the above
11
. In the HDLC _______, the secondary device must have permission from the primary before it can transmit.
  • NRM (normal response mode)
  • ARM (asynchronous response mode)
  • ABM (asynchronous balanced mode)
  • any of the above
12
. There are _______ types of HDLC frames.
  • 1
  • 2
  • 3
  • 4
13
. An HDLC _______ is used to transport user data and control information.
  • I-frame
  • S-frame
  • U-frame
  • A-frame
14
. An HDLC _______ can transport system management information.
  • I-frame
  • S-frame
  • U-frame
  • A-frame
15
. The HDLC flag field is _______.
  • 01000010
  • 01010101
  • 10000001
  • 01111110
16
. HDLC inserts a redundant 0 bit after the _______ consecutive 1 bit in the message data.
  • fifth
  • sixth
  • seventh
  • eighth
17
. If the HDLC flag field pattern is found in the message data field, it needs to be altered through _______
  • bit stuffing
  • byte stuffing
  • bit synchronization
  • byte synchronization
18
. If the HDLC receiver counts more than six but less than fifteen consecutive 1s, this signifies _______
  • data
  • a flag
  • an abort
  • an idle channel
19
. If the HDLC receiver counts fifteen or more consecutive 1s, this signifies _______.
  • data
  • a flag
  • an abort
  • an idle channel
20
. If the HDLC receiver counts exactly six consecutive 1s, this signifies _______
  • data
  • a flag
  • an abort
  • an idle channel
21
. If the HDLC receiver counts exactly five consecutive 1s, this signifies _______
  • data
  • a flag
  • an abort
  • an idle channel
22
. When primary station A sends an HDLC frame to secondary station B, the address field contains the _______
  • physical address of station A
  • physical address of station B
  • logical address of station A
  • logical address of station B
23
. When secondary station B sends an HDLC frame to primary station A, the address field contains the _______
  • physical address of station A
  • physical address of station B
  • logical address of station A
  • logical address of station B
24
. In a five-byte HDLC address field, _______ in a 0 bit and _______ in a 1 bit
  • 2 bytes end; 3 bytes end
  • 3 bytes end; 2 bytes end
  • 4 bytes end; 1 byte ends
  • 1 byte ends; 4 bytes end
25
. If the least significant bit of a byte in an HDLC address field is 1, this means there are _______ more address bytes
  • 0
  • 1
  • 2
  • 3
26
. If the first two bits of an HDLC control field both 1s, this signifies _______.
  • an I-frame
  • an S-frame
  • a U-frame
  • an E-frame
27
. All HDLC control fields contain _______.
  • N(S) bits
  • N(R) bits
  • a P/F bit
  • code bits
28
. The HDLC _______ indicate the number of the frame being sent.
  • N(S) bits
  • N(R) bits
  • P/F bit
  • code bits
29
. The HDLC _______ for acknowledgment.
  • N(S) field is
  • N(R) field is
  • P/F bit is
  • code bits are
30
. _______ contains both N(S) and N(R) bits
  • An I-frame
  • An S-frame
  • A U-frame
  • none of the above
31
. _______ contains neither N(S) nor N(R) bits.
  • An I-frame
  • An S-frame
  • A U-frame
  • none of the above
32
. _______ is sent when acknowledgment is needed but there is no user data to transmit
  • An I-frame
  • An S-frame
  • A U-frame
  • none of the above
33
. The HDLC control field in _______ is increased to two bytes in the extended mode
  • an I-frame
  • an S-frame
  • a U-frame
  • a and b
34
. The HDLC P/F bit means poll when the frame is sent by a _______ station to a _______ station.
  • secondary; primary
  • primary; secondary
  • secondary; combined
  • secondary; secondary
35
. The HDLC P/F bit means final when the frame is sent by a _______ station to a _______ station
  • secondary; primary
  • primary; secondary
  • secondary; combined
  • secondary; secondary
36
. An HDLC frame uses _______ for error detection.
  • checksum
  • VRC
  • LRC
  • CRC
37
. In an HDLC S-frame the N(R) field can contain _______.
  • the number of the next frame expected
  • the number of a damaged frame
  • the number of address bytes
  • a and b
38
. Negative acknowledgment requires an HDLC S-frame with the code field set to _______
  • 01
  • 10
  • 11
  • a or c
39
. Polling or selecting requires an HDLC S-frame with the code field set to _______
  • 00
  • 01
  • 10
  • a or c
40
. The HDLC U-frame has a _______ bit code field
  • 2
  • 3
  • 4
  • 5
41
. The U in U-frame stands for _______.
  • unsupervised
  • unilateral
  • unnumbered
  • unicast
42
. Mode setting is handled by the _______ -frame.
  • I
  • S
  • U
  • any of the above
43
. Disconnection and initialization are handled by the _______ frame.
  • I
  • S
  • U
  • any of the above
44
. A secondary station has three data frames to send in response to a poll. The P/F bit for the first frame is _______, for the second frame it's _______, and for the third (last) frame it's _______
  • 1; 1; 1
  • 0; 0; 0
  • 1; 0; 0
  • 0; 0; 1

 
 
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