Computer Science - Communication and Network Concepts
Exam Duration: 45 Mins Total Questions : 30
Port number is
- (a)
process number
- (b)
computer's physical address
- (c)
Both (a) and (b)
- (d)
None of the above
Which of these network devices belongs at the OSI physical layer?
- (a)
Repeater
- (b)
Router
- (c)
Switch
- (d)
Bridge
In which ARQ, if a NAK is received, only specific damaged or lost frame is re-transmitted?
- (a)
stop-and-wait
- (b)
go-back-n
- (c)
selective repeat
- (d)
Both (a) and (b)
A router consults its routing table
- (a)
to determine voice of packets
- (b)
to determine data of packets
- (c)
to determine best path for a packets
- (d)
to determine how packet switching could work.
The hamming distance between 001111 and 010011 is
- (a)
1
- (b)
2
- (c)
3
- (d)
4
Which of the following ISO levels is more closely related to the physical communication facilities ?
- (a)
Application
- (b)
Session
- (c)
Network
- (d)
Data link
A network that requires human intervention to route signals is called a
- (a)
bus network
- (b)
ring network
- (c)
star network
- (d)
T-switched network
Contentions is
- (a)
one or more conductors that serve as a common connection for a related group of devices
- (b)
a continuous frequency capable of being modulated or impressed with a second signal
- (c)
the condition when two or more sections attempt to use the same channel at the same time
- (d)
a collection of interconnected functional units that provides a data communications service among stations attached to the network
Which of the following has the smallest default maximum physical packet size ?
- (a)
ARCnet
- (b)
Ethernet
- (c)
Token ring [4 M byte/s]
- (d)
Token Ring [16 M byte/s]
Start and stop bits do not contain an information but are used in serial communication for
- (a)
error detection
- (b)
synchronization
- (c)
error correction
- (d)
slowing down the communication
ALOHA
- (a)
is used for channel allocation problem
- (b)
is used for data transfer
- (c)
is buffering
- (d)
All of the above
IP address can be used to specify a broadcast and map to hardware broadcast if available. By conversion broadcast address has hosted with all bits
- (a)
0
- (b)
1
- (c)
Both (a) and (b)
- (d)
None of these
DNS is used to locate the
- (a)
MAC address of URL
- (b)
IP address of URL
- (c)
root domain of URL
- (d)
domain name of a URL
Which of the following items is not used in Local Area Network (LAN) ?
- (a)
Computer
- (b)
Modem
- (c)
Printer
- (d)
Cable
Which of the following is the product of LLC sublayer ?
- (a)
802.3 frame
- (b)
802.5 frame
- (c)
PDU ( Protocol Data Unit )
- (d)
Preamble
How many characters (7 bits + 1 parity) can be transmitted over a 2400 byte/s line, if the transfer is synchronous ( 1 start and 1 stop bit ) ?
- (a)
300
- (b)
240
- (c)
250
- (d)
275
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 division of a message into segments is a function of the
- (a)
physical
- (b)
data link
- (c)
transport
- (d)
network
To interconnect two IP classes, class A and class C networks
- (a)
a bridge is needed
- (b)
a class B network is needed
- (c)
a router is needed
- (d)
can not say
The maximum number of subnets in calss C using the masks 255.255.255.0 ?
- (a)
256
- (b)
216
- (c)
1
- (d)
0
Information on a single computer can be accessed by other computers in the network. It is called............
- (a)
sharing resources
- (b)
sharing information
- (c)
sharing instructions
- (d)
communication
The number of topologies used in the network is.................
- (a)
2
- (b)
3
- (c)
5
- (d)
7
Which one of the following is safe when storage devices are connected in the network?
- (a)
File transfer
- (b)
File storage
- (c)
File updates synchronisation
- (d)
File archiving
Each computer on net is called is...................
- (a)
Node
- (b)
System
- (c)
Host
- (d)
Net computer
Which one of the following is a multimedia portion of the Internet?
- (a)
TCP
- (b)
ICANN
- (c)
IP
- (d)
WEB
Which one of the following software is used to browse the internet?
- (a)
Website
- (b)
Web browser
- (c)
Web page
- (d)
Web page editors
Which one of the following translate HTML documents of the website and allows to views it on the screen?
- (a)
HTML
- (b)
HTTP
- (c)
TCP/IP
- (d)
Web browser
Which one of the following indicates the link to other sites?
- (a)
IP address
- (b)
TCP/IP address
- (c)
Hyperlink
- (d)
URL
The OSI provided a network architecture with........ layers
- (a)
3
- (b)
5
- (c)
6
- (d)
7
IP stands for
- (a)
Internet Police
- (b)
Internet Place
- (c)
Internet Protocol
- (d)
Internet Printer