1
A network that spans a city is called a
Correct Answer
MAN
☑ MCQ PRACTICE
Computer Networks Unit 1
Practice objective questions for quick revision and examination preparation. Try answering each question before revealing the answer.
Computer Networks MCQs - Unit 1
2
A network that spans a country or a continent is called a
Correct Answer
WAN
3
The number of layers in the OSI reference model is
Correct Answer
seven
4
The number of layers in the TCP/IP reference model (as described by Tanenbaum) is
Correct Answer
four
5
The layer of the OSI model that deals with the transmission of raw bits is the
Correct Answer
physical layer
6
The unit of data at the data link layer is the
Correct Answer
frame
7
The unit of data at the network layer is the
Correct Answer
packet
8
The OSI layer that deals with the syntax and semantics of the information exchanged, including encryption and compression, is the
Correct Answer
presentation layer
9
The OSI layer that handles dialog control and synchronization is the
Correct Answer
session layer
10
Which two OSI layers have no separate counterpart in the TCP/IP model?
Correct Answer
Session and presentation
11
ARPANET was the first
Correct Answer
packet-switched network
12
The Internet Protocol (IP) is
Correct Answer
connectionless
13
In twisted-pair cable, the wires are twisted to
Correct Answer
reduce electrical interference (crosstalk)
14
Which guided medium has the highest bandwidth and is immune to electromagnetic interference?
Correct Answer
Fiber optic cable
15
The two types of optical fiber are
Correct Answer
single-mode and multimode
16
Light travels along an optical fiber because of
Correct Answer
total internal reflection
17
Which of the following is a wireless transmission method?
Correct Answer
Microwave transmission
18
In bit stuffing with the flag 01111110, a 0 is inserted after how many consecutive 1s in the data?
Correct Answer
five
19
To detect d errors, a code needs a Hamming distance of
Correct Answer
d + 1
20
To correct d errors, a code needs a Hamming distance of
Correct Answer
2d + 1
21
A single parity bit can detect
Correct Answer
any odd number of bit errors
22
In CRC with a generator polynomial of degree r, the number of bits appended to the data is
Correct Answer
r
23
In a Hamming code, the check bits are placed at positions that are
Correct Answer
powers of 2
24
The Internet checksum is computed as the
Correct Answer
16-bit one's complement sum
25
Byte stuffing is used in framing to
Correct Answer
prevent a flag byte in the data from being mistaken for a frame boundary
Fill in the Blanks
26
The OSI reference model has ______ layers.
Correct Answer
seven
27
The TCP/IP reference model has ______ layers.
Correct Answer
four
28
The unit of data at the data link layer is the ______.
Correct Answer
frame
29
The unit of data at the network layer is the ______.
Correct Answer
packet
30
The first packet-switched network was ______.
Correct Answer
ARPANET
31
The layer responsible for routing packets is the ______ layer.
Correct Answer
network
32
An optical fiber works on the principle of total internal ______.
Correct Answer
reflection
33
Twisted-pair wires are twisted to reduce ______.
Correct Answer
interference (crosstalk)
34
In bit stuffing, a 0 is inserted after ______ consecutive 1s.
Correct Answer
five
35
To detect d errors, a code needs a Hamming distance of ______.
Correct Answer
d + 1
36
To correct d errors, a code needs a Hamming distance of ______.
Correct Answer
2d + 1
37
CRC uses a ______ polynomial.
Correct Answer
generator
38
A single parity bit can detect any ______ number of bit errors.
Correct Answer
odd
39
In a Hamming code, the check bits are placed at positions that are powers of ______.
Correct Answer
2
40
A network that covers a city is called a ______.
Correct Answer
MAN (Metropolitan Area Network)