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computer networks
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Basics of computer networks
Flashcards
30 cards
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Practice quiz
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Questions
30
Answers
1
define the process of adding 1 extra byte whenever there is a flag or ESC character in the text
bit stuffing
error detection
framming
byte stuffing
2
Error control is the function of ---- layer
physical layer
data link layer
transport layer
network layer
3
size of receiver window in Go back N arq is..
1
0
2m
none of the given
4
what is an example for noisy channel protocol ?
simplest
Stop and wait
go back N ARQ
5
error detection and correction are collectively known as...
link control
framing
error control
flow control
6
what is VCI ?
Virtual circuit Identifier
Visible circuit ID
7
pattern of flag in bit stuffing is ----
01111110
01010101
011110
011101010
8
PDU in physical layer is -----
frames
messages
bits
segments
9
in packet switching resources have to be reserved
false
true
10
only single bit error correction is possible in hamming code
true
false
11
In stop and wait ARQ,---- re used to number the frames
Sequence Number
message number
None of the above
Frame number
12
formula used in hamming code is...
none of the given
2p >= p-m+1
2p >=p+m+1
2m >=m+p+1
13
what is ARQ ?
Automated Resource Query
Automated Request Query
Automatic Repeat Request
Automated Repeat Query
14
flow control and error control are collectively known as ----
protocols
media access control
data link control
standards
15
CRC means...
cyclic redundancy check
checking redundancy in communication
none of the given
cyclic repeating check
16
---- is a combination of circuit and packet switching
virtual switching
message switching
17
device used in data link layer is...
switches
hub
cables
routers
18
---- restrict the amount of data that the sender can send before waiting for acknowledgement
flow control
data control
error control
jamming
19
At physical layer --- switching takes place
packet
message
virtual
circuit
20
Hamming distance between 2 words is..
no of bits in both words
sum of bits in 2 words
no of differences between corresponding bits
none of the given
21
Parity bits are added to..
to detect errors only
to correct error only
both of given
none of the given
22
node to node communication is achieved thorough ----- layer
transport layer
physical layer
network layer
data link layer
23
Media access control is the function of ----- layer
datalink
application
network
physical
24
choose the sliding window protocol from following
Simplest
stop and wait
selective repeat ARQ
None of the given
25
Routing tables are used in --- switching
circuit
both of these
datagram
none of these
26
In ---- protocol, there is no flow control and error control
ALOHA
simplest
Stop and wait
ARQ
27
size of sending window in Go Back N Arq must be less than..
2m
2m-1 - 1
2m+1
2m - 1
28
How many layers are there in OSI model ?
8
6
7
5
29
what is the full form of OSI
open source internet
open source in India
open system internet
open system interconnection
30
efficiency of circuit switching is greater than packet switching
true
false
