Networking Basics-1

Assignment A

Q1. What do you understand by Computer Network? What is its Benefit? Explain in brief classification of Network based on size?
Q2. What do you mean by transmission media? Explain various types of Transmission media?
Q3. What is Network Topology? Explain in brief different types of Network Topology?
Q4) Write Short Notes on:-
a) Router
b) Bridge
c) Coaxial Cable
d) Cryptography
e) Flow Control and Error Control
f) WWW
Q5) what do you understand by Transmission Technology? Explain in brief different modes of Communication?

Assignment B
Q1) Explain the rationale behind the OSI Seven Layer Model. Briefly describe the role of each layer and its main function.
Q2) why do we need POP3 or IMAP4 for electronic mail?
Q4) why do we need a DNS System when we can directly use an IP address?
Q3) why do we require Digital Signatures? Explain in brief different stages for the Verification of Digital Signatures.
Q4) Differentiate between
a) Full Duplex & Half Duplex
b) Encryption & Decryption
c) Serial & Parallel Communication
d) Analog & Digital Transmission

Assignment C

Question 1: In OSI network architecture, the dialogue control and token management are responsibility of
a. session layer
b. network layer
c. transport layer
d. data link layer
e. none of above

Question 2: In OSI network architecture, the routing is performed by
a. network layer
b. data link layer
c. transport layer
d. session layer
e. none of above

Question 3: Which of the following performs modulation and demodulation?
a. fiber optics
b. satellite
c. coaxial cable
d. modem
e. none of the above

Question 4: The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as: a. modulation
b. demodulation
c. synchronizing
d. digitizing

Question 5: How many OSI layers are covered in the X.25 standard?
a. Two
b. Three
c. Seven
d. Six
e. None of above

Question 6: Layer one of the OSI model is
a. physical layer
b. link layer
c. transport layer
d. network layer
e. none of above

Question 7: Which of the following communication modes support two-way traffic but in only one direction at a time?
a. simplex
b. half duplex
c. three-quarters duplex
d. all of the above
e. none of the above

Question 8: The interactive transmission of data within a time sharing system may be best suited to
a. simplex lines
b. half-duplex lines
c. full duplex lines
d. biflex-lines

Question 9: Which of the following statement is incorrect?
a. The difference between synchronous and asynchronous transmission is the clocking derived from the data in synchronous transmission.
b. Half duplex line is a communication line in which data can move in two directions, but not at the same time.
c. Teleprocessing combines telecommunications and DP techniques in online activities
d. Batch processing is the prefered processing mode for telecommunication operation.

Question 10: Which of the following is considered a broad band communication channel?
a. coaxial cable
b. fiber optics cable
c. microwave circuits
d. all of above

Question 11: Which of the following is not a transmission medium?
a. telephone lines
b. coaxial cables
c. modem
d. microwave systems

Question 12: Which of the following does not allow multiple uses or devices to share one communication line?
a. doubleplexer
b. multiplexer
c. concentrator
d. controller

Question 13: Which of the following is an advantage to using fiber optics data transmission?
a. resistance to data theft
b. fast data transmission rate
c. low noise level
d. all of above

Question 14: Which of the following is required to communicate between two computers?
a. communications software
b. protocol
c. communication hardware
d. all of above including access to transmission medium

Question 15: Which data communication method is used to transmit the data over a serial communication link?
a. simplex
b. half-duplex
c. full-duplex
d. b and c
e. None of above

Question 16: What is the minimum number of wires needed to send data over a serial communication link layer?
a. 1
b. 2
c. 4
d. 6
e. none of above

Question 17: Which of the following types of channels moves data relatively slowly?
a. wide band channel
b. voice band channel
c. narrow band channel

Question 18: Most data communications involving telegraph lines use:
a. simplex lines
b. wideband channel
c. narrowband channel
d. dialed service

Question 19: A communications device that combines transmissions from several I/O devices into one line is
a. concentrator
b. modifier
c. multiplexer
d. full-duplex line

Question 20: How much power (roughly) a light emitting diode can couple into an optical fiber?
a. 100 microwatts
b. 440 microwatts
c. 100 picowatts
d. 10 miliwatts

Question 21: The synchronous modems are more costly than the asynchronous modems because
a. they produce large volume of data
b. they contain clock recovery circuits
c. they transmit the data with stop and start bits
d. they operate with a larger bandwidth
e. none of above

Question 22: Which of the following statement is correct?
a. terminal section of a synchronous modem contains the scrambler
b. receiver section of a synchronous modem contains the scrambler
c. transmission section of a synchronous modem contains the scrambler
d. control section of a synchronous modem contains the scrambler
e. none of the above

Question 23: In a synchronous modem, the digital-to-analog converter transmits signal to the
a. equilizer
b. modulator
c. demodulator
d. terminal
e. none of above

Question 24: Which of the following is not a flow Control method?
a. Buffering
b. Unbuffered
c. Windowing
d. Congestion avoidance

Question 25: A remote batch-processing operation in which data is solely input to a central computer would require
a. telegraph line
b. simplex lines
c. mixed band channel
d. all of above

Question 26: A band is always equivalent to
a. a byte
b. a bit
c. 100 bits
d. none of above

Question 27: The loss in signal power as light travels down the fiber is called
a. attenuation
b. progragation
c. scattering
d. interruption

Question 28: Communications circuits that transmit data in both directions but not at the same time are operating in
a. a simplex mode
b. a half duplex mode
c. a full duplex mode
d. an asynchronous mode

Question 29: As the data moves from the Upper to Lower Layers, headers are
a. Added
b. Subtracted
c. Rearranged
d. Modified

Question 30: In communication satellite, multiple repeaters are known as
a. detector
b. modulator
c. stations
d. transponders

Question 31: While transmitting odd-parity coded symbols, the number of zeros in each symbol is
a. odd
b. even
c. a and b both
d. unknown

Question 32: Which type of network provides customers with limited access to corporate data such as inventory, Parts lists, and orders?
a. intranet
b. Extranet
c. Internetwork
d. Internet

Question 33: An example of an analog communication method is a. laser beam b. microwave
c. voice grade telephone line
d. all of the above

Question 34: Physical Layer is located in which layer of OSI
a. Layer 5
b. Layer 3
c. Layerl
d. Layer4

Question 35: Physical Layer can only communicate with
a. Application Layer
b. Data link Layer
c. Transport Layer
d. Network Layer

Question 36: The Calculated value used by the Data Link Layer for error detections is
a. Checksum
b. Parity
c. CRC
d. The Data Link layer does not implement error detection

Question 37: The channel in the data communication model can be
a. postal mail services
b. telephone lines
c. radio lines
d. any of the above

Question 38: Dividing a Network into smaller collisions domains is called
a. Bridging
b. Segmentation
c. Routing
d. Domaining

Question 39: Which of the following transmission systems provide the highest data rate to in individual device? a. computer bus b. telephone lines
c. voice and mode
d. lease lines

Question 40: A protocol is a set of rules governing a time sequence of events that must take place
a. between peers
b. between an interface
c. between modems
d. across an interface