Q.1

With an IP address starting atyou currently havesubnets. What subnet mask should you use to maximize the number of available hosts?

  • 192
  • 224
  • 240
  • 248
  • 252
Q.2

The MAC (Media Access Control) address of the network card is used in both Ethernet and Token-Ring networks and is essential for communication. What does MAC provide?

  • A logical address that identifies the workstation
  • A physical address that is randomly assigned each time the computer is started
  • A physical address that is assigned by the manufacturer
  • The logical domain address for the workstation
  • An alias for the computer name
Q.3

Which of the following condition is used to transmit two packets over a medium at the same time?

  • Contention
  • Collision
  • Synchronous
  • Asynchronous
  • None of the above
Q.4

The data-link layer, in reference to the OSI model, specifies

  • data link procedures that provide for the exchange of data via frames that can be sent and received
  • the interface between the X.25 network and packet mode device
  • the virtual circuit interface to packet-switched service
  • All of the above
  • None of the above
Q.5

What function does a serial interface perform in data communication?

  • Converts serial data into audio signals
  • Converts analog signals into digital signals
  • Converts parallel data into a stream of bits
  • Decodes incoming signals into computer data
  • None of the above
Q.6

A smart modem can dial, hang up and answer incoming calls automatically. Can you tell who provides the appropriate instruction to the modem for this purpose?

  • Communications software
  • Error detecting protocols
  • Link access procedure (LAP)
  • Telecommunications
  • None of the above
Q.7

What is the minimum number of wires required for sending data over a serial communications links?

  • 2
  • 1
  • 4
  • 3
  • None of the above
Q.8

Videotex is a combination of

  • television
  • communication
  • computer technology
  • All of the above
  • None of the above
Q.9

The core diameter of a single-mode fibers is about

  • 10 times the wavelength of the light carried in the fiber
  • 10 times the fiber radius
  • 7 times the light carried in the fiber
  • 3 times the wavelength of the light carried in the fiber
  • None of the above
Q.10

Most networks are connected to other local area or wide area networks. Select the best fit for answer:

  • Internet works
  • The Internet
  • Internet revolution
  • Internet technologies
Q.11

How many pairs of stations can simultaneously communicate on Ethernet LAN?

  • 1
  • 2
  • 3
  • multiple
  • None of the above
Q.12

Which of the following is an important characteristic of LAN?

  • application independent interfaces
  • unlimited expansion
  • low cost access for low bandwidth channels
  • parallel transmission
  • None of the above
Q.13

The most flexibility in how devices are wired together is provided by

  • bus networks
  • ring networks
  • star networks
  • T-switched networks
  • None of the above
Q.14

The systematic access of small computers in a distributed data processing system is referred to as:

  • dialed service
  • multiplexing
  • polling
  • conversational mode
  • None of the above
Q.15

The process of converting analog signals into digital signals so they can be processed by a receiving computer is referred to as:

  • modulation
  • demodulation
  • synchronizing
  • synchronizing
  • None of the above
Q.16

One important characteristic of the hub architecture of ARC-net is

  • directionalized transmission
  • access control and addressing
  • multiple virtual networks
  • alternative routing
  • None of the above
Q.17

Working of the WAN generally involves

  • telephone lines
  • microwaves
  • satellites
  • All of the above
  • None of the above
Q.18

What does the acronym ISDN stand for?

  • Indian Standard Digital Network
  • Integrated Services Digital Network
  • Intelligent Services Digital Network
  • Integrated Services Data Network
  • None of the above
Q.19

A group of 2m - 1 routers are interconnected in a centralized binary tree, with router at each tree node. Router I communicate with router J by sending a message to the root of the tree. The root then sends the message back down to J. Then find the mean router-router path length.

  • 2 (m - 2)
  • 2 (2m - 1)
  • m - 1
  • (2m - l)/mJ
Q.20

Which of the following allows a simple email service and is responsible for moving messages from one mail server to another?

  • IMAP
  • DHCP
  • SMTP
  • FTP
  • POP3
Q.21

When a group of computers is connected together in a small area without the help of telephone lines, it is called

  • Remote communication network (RCN)
  • Local area network(LAN)
  • Wide area network (WAN)
  • Value added network (VAN)
  • None of the above
Q.22

A form of modulation In which the amplitude of a carrier wave is varied in accordance with some characteristic of the modulating signal, is known as

  • Aloha
  • Angle modulation
  • Amplitude modulation
  • modem
  • None of the above
Q.23

CSMA (Carrier Sense Multiple Access) is

  • a method of determining which device has access to the transmission medium at any time
  • a method access control technique for multiple-access transmission media.
  • a very common bit-oriented data link protocol issued by ISO.
  • network access standard for connecting stations to a circuit-switched network
  • None of the above
Q.24

Communication circuits that transmit data in both directions but not at the same time are operating in

  • a simplex mode
  • a half-duplex mode
  • a full-duplex mode
  • an asynchronous mode
  • None of the above
Q.25

Which of the following communications modes support two-way traffic but in only one direction of a time?

  • simplex
  • half-duplex
  • three-quarters duplex
  • full-of the above
  • None of the above
Q.26

Which of the following TCP/IP internet protocol a diskless machine uses to obtain its IP address from a server?

  • RDP
  • RARP
  • RIP
  • X.25
  • None of the above
Q.27

You need to determine whether IP information has been assigned to your Windows NT. Which utility should you use?

  • NBTSTAT
  • NETSTAT
  • IPCONFIG
  • WINIPCFG
  • PING
Q.28

IEEE projectdivides the data link layer into an upper _____ sublayer and a lower _____ sublayer.

  • HDLC, PDU
  • PDU, HDLC
  • MAC, LLC
  • LLC, MAC
  • None of the above
Q.29

In cyclic redundancy checking, the divisor is _____ the CRC.

  • the same size as
  • one bit less than
  • one bit more than
  • two bits more
Q.30

Which of the following frequency ranges is used for AM radio transmission?

  • Very Low Frequency : 3 kHz to 30 kHz
  • Medium Frequency : 300 kHz to 3 MHz
  • High Frequency : 3 MHz to 30 MHz
  • Very High Frequency : 30 MHz to 300 MHz
  • None of the above
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