IV/BCA/404 Student's Copy
2 0 1 8
4th Semester
BACHELOR OF COMPUTER APPLICATIONS
Paper BCA-404
Networking—I
Old Course
Full Marks 75
Time 3 hours
PART A—OBJECTIVE
Marks 25
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 15
1. Tick the correct answer in the brackets provided 1×10=10
Which topology requires a central controller or hub?
Mesh Star
Bus Ring
Transmission media are usually categorized as
fixed or unfixed guided or unguided
digital and analog metallic or non-metallic
Data signals can be
analog only digital only
both analog and digital All of the above
/562 1 Contd.
is the set of techniques that allows the simultaneous
transmission of multiple signals across a single data link.
Modulating Compressing
Digitizing Multiplexing
ARQ stands for
Automatic Repeat Quantization
Automatic Repeat reQuest
Automatic Retransmission reQuest
Acknowledge Repeat reQuest
The OSI model consists of layers.
2 3
5 7
are used for cellular phone, satellite, and wireless LAN
communications.
Radio waves Infrared waves
Microwaves Ultraviolet waves
is a type of transmission impairment in which the signal loses
strength due to the resistance of the transmission medium.
Attenuation Distortion
Noise Decibel
Which multiplexing technique transmits digital signals?
WDM FDM
TDM All of the above
Which error detection method uses one's complement arithmetic?
Simple parity check
Two-dimensional parity check
CRC
Checksum
2. State whether the following statements are True or False by putting a
Tick mark in the brackets provided 1×5=5
Communication between a computer and a keyboard is full-duplex
transmission.
True False
IV/BCA/404 2 Contd.
The most common twisted-pair cable used in communications is
unshielded twisted-pair (UTP).
True False
Increasing the levels of a signal increases the reliability of the system.
True False
The simplest type of switching fabric is the crossbar switch.
True False
HDLC is an acronym for high-level data link control.
True False
SECTION—B
Marks 10
Answer the following questions 2×5=10
1. Differentiate between half duplex and full duplex.
2. Give two advantages of optical fiber cable.
3. How is digital signal differing from analog signal?
4. What is virtual circuit network?
5. Define CRC.
PART B—DESCRIPTIVE
Marks 50
The figures in the margin indicate full marks for the questions
1. Explain the layers of TCP/IP protocol suite by giving suitable diagram. 5
What is protocol? Why do we need protocols and standards? 5
OR
Explain the different categories of networks giving a suitable diagram. 5
What is IP address? Define briefly the physical address, logical address,
port address and specific address. 5
2. What are infrared waves? Write their advantages and disadvantages. 5
IV/BCA/404 3 Contd.
Define twisted-pair cable. Explain the categories and applications of
twisted-pair cables. 5
OR
Define microwaves. Write any three characteristics of microwaves.
Write the advantages and disadvantages of a fiber-optic cable. 5
3. What is transmission impairment? What are the causes of transmission
impairment? 5
Explain the pulse code modulation technique by giving a suitable
diagram. 5
OR
Explain NRZ line coding scheme with suitable diagram. 5
Explain various methods for measuring the performance of a network. 5
4. Explain frequency division multiplexing. How is it used in AM and FM
radio broadcasting? 5
Describe with neat diagram, the multiplexing and demultiplexing
processes of FDM. 5
OR
Write any five differences between circuit-switched network and
datagram network. 5
Explain circuit switching. What are the different phases of circuitswitched
network? 5
5. Explain Go-Back-N ARQ method. 5
What is HDLC? Explain the different frame formats of HDLC. 5
OR
What are Hamming code and Hamming distance? Explain the process
to determine the position of parity bits for 7-bit Hamming code.