Computer Network
Exam Duration: 45 Mins Total Questions : 30
As the data packet moves from a lower layer to higher layer, the headers
- (a)
added
- (b)
removed
- (c)
re-arranged
- (d)
modified
Congestion control is done in
- (a)
MAC layer
- (b)
data link layer
- (c)
transport layer
- (d)
application layer
Session layer is used for
- (a)
dialogue control
- (b)
traffic control
- (c)
flow control
- (d)
error control
The Internet Protocol (IP) generally corresponds to OSi layer
- (a)
network layer
- (b)
transport
- (c)
data link
- (d)
session
In OSI PDU stands for
- (a)
Private Data Unit
- (b)
Public Data Unit
- (c)
Protected Data Unit
- (d)
Protocol Data Unit
Which error correction method involves polynomials?
- (a)
Simple parity check
- (b)
Hamming code
- (c)
CRC
- (d)
Checksum
In go-back-n ARQ if 4 frames are sent and if ACK 4 arrives then the sender will
- (a)
send 1, 2, 3 frame
- (b)
send next frame
- (c)
send all four again
- (d)
None of these
In sliding window protocol the receiver window can be at most
- (a)
2n
- (b)
2n + 1
- (c)
2n - 1
- (d)
1
In go-back-n the window size of receiver side is always
- (a)
2
- (b)
1
- (c)
2n
- (d)
2n-1
In selecting repeat ARQ the window size of sender will and receive must be
- (a)
2n
- (b)
2n/3
- (c)
2n/2
- (d)
1
A routing table contains
- (a)
The destination network IP
- (b)
The hop count
- (c)
next hop router IP
- (d)
All of the above
Given an IP address 201.14.78.65 and the subnet mask 255.255.255.224. What is the subnet address ?
- (a)
201.14.78.64
- (b)
20.14.78.65
- (c)
201.14.77.64
- (d)
201.14.77.66
How many IP addresses are available to a company with a class B address?
- (a)
8,192
- (b)
16,384
- (c)
32,768
- (d)
65,536
A firewall is
- (a)
used to protect a computer from fires and floods
- (b)
a form of virus
- (c)
a screen saver program
- (d)
None of the above
A proxy server is
- (a)
a backup server
- (b)
an email server
- (c)
a poor file server
- (d)
None of these
Which of the following ISO levels is more closely related to the physical communication facilities ?
- (a)
Application
- (b)
Session
- (c)
Network
- (d)
Data link
Which of the following is not a field in the ethernet message packet ?
- (a)
Type
- (b)
Data
- (c)
Pin code
- (d)
Address
A device that can convert digital signals to analog signals is
- (a)
a packet
- (b)
a modem
- (c)
an emulator
- (d)
None of these
Communication via circuit switching involves three phases which are
- (a)
circuit establishment, data transfer, circuit disconnect
- (b)
circuit establishment, data compression, circuit disconnect
- (c)
data transfer, data compression, circuit disconnect
- (d)
circuit establishment, data compression
With electronic mail you can do which of the following ?
(i) Send and read mail
(ii) Delete , replay to or forward
(iii) Delete someone else's mail
(iv) Cannot say
- (a)
Only (i)
- (b)
(i) and (iii)
- (c)
(i) and (ii)
- (d)
All of these
What frequency range is used for TV transmission and lower power microwave applications ?
- (a)
Very low frequency 3 kHz to 30 kHz
- (b)
Medium frequency 300 kHz to 3 MHz
- (c)
Ultra high frequency 300 MHz to 3000 MHz
- (d)
Super high freqency 3000 MHz to 30000 MHz
End-to-end connectivity is provided from host-to-host in
- (a)
network layer
- (b)
session layer
- (c)
data link layer
- (d)
transport layer
ICMP ( Internet Control Message Protocol ) is
- (a)
a protocol used to dynamically bind a high level IP address to low level physical hardware address
- (b)
a protocol for transferring files from one machine to anther
- (c)
a protocol used to monitor computers
- (d)
a protocol that handles error and control messages
Bit stuffing refers to
- (a)
unserting a 0 in user steam differentiate it with a flag
- (b)
inserting a 0 in flag stream to avoid ambiguity
- (c)
appending a nibble to the flag sequence
- (d)
appending a nibble to the use data steam
Which of the following connectivity devices typically work at the physical layer of OSI model ?
- (a)
Routers
- (b)
Bridges
- (c)
Repeaters
- (d)
Gateways
At network layer protocol defined by TCP/IP is
- (a)
TCP
- (b)
UDP
- (c)
IP
- (d)
None of these
Packets of the same session may be routed through different paths in
- (a)
TCP but not UDP
- (b)
TCP and UDP
- (c)
UDP but not TCP
- (d)
Neither TCP nor UDP
The main characteristic of routing algorithm is that
- (a)
the algorithm should produce results in a stable manner in varying traffic conditions
- (b)
the algorithm must be fair in selecting routes
- (c)
the algorithm must be able to cope with changes in topology
- (d)
All of the above
A subnet mask in class A have ........1's with the remaining bits 0's
- (a)
8
- (b)
4
- (c)
33
- (d)
3
Given an IP address 156.233.42.56 with a subnet mask of 7 bit. How many hosts and subnets are possible ?
- (a)
126 hosts and 510 subnets
- (b)
128 hosts and 512 subnets
- (c)
510 hosts and 126 subnets
- (d)
512 hosts and 128 subnets