Q.1

The size or magnitude of a voltage or current waveform is

  • Amplitude
  • Aloha
  • Angle Modulation
  • Attenuation
  • None of the above
Q.2

Which of the following network access standard is used for connecting stations to a circuit-switched network?

  • X.3
  • X.21
  • X.25
  • X.75
  • None of the above
Q.3

What operates in the Data Link and the Network layer?

  • NIC
  • Bridge
  • Brouter
  • Router
  • None of the above
Q.4

What is the name of the computer based EMMS that provides a common forum where users can check in at their convenience, post messages, actively exchange ideas and participate in ongoing discussions?

  • E-mail
  • Bulletin board system (BBS)
  • Teleconferencing
  • Videoconferencing
  • None of the above
Q.5

Error control is needed at the transport layer because of potential errors occurring _____.

  • from transmission line noise
  • in routers
  • from out-of-sequence delivery
  • from packet losses.
Q.6

In OSI model, which of the following layer provides error-free delivery of data?

  • Data link
  • Network
  • transport
  • Session
  • None of the above
Q.7

Error detection at the data link level is achieved by?

  • Bit stuffing
  • Hamming codes
  • Cyclic Redundancy codes
  • Equalization
  • None of the above
Q.8

Packet Switch Stream (PSS) was introduced in

  • the US in 1961 (&) the UK in 1981
  • the UK in 1980
  • the US in 1961
  • None of the above
Q.9

The physical layer of a network

  • defines the electrical characteristics of signals passed between the computer and communication devices
  • controls error detection and correction
  • constructs packets of data and sends them across the network
  • All of the above
  • None of the above
Q.10

The standard suit of protocols used by the Internet, intranets, extranets, and some other networks.

  • TCP/IP
  • Protocol
  • Open Systems
  • Internetwork processor
Q.11

Networks that follow the 802.5 standard appear to be in a star topology but are actually operating in what type of topology?

  • Linear bus
  • Modified star
  • Modified ring
  • Ring
  • Hybrid hub
Q.12

Sending a file from your personal computer's primary memory or disk to another computer is called

  • uploading
  • downloading
  • logging on
  • hang on
Q.13

The 802.5 standard implements a way for preventing collisions on the network. How are collisions prevented when using this standard?

  • CSMA/CD
  • Token passing
  • Collision detection
  • Time sharing
  • Switched repeaters
Q.14

Which of the following medium access control technique is used for bus/tree?

  • token ring
  • token bus
  • CSMA
  • MAC
  • None of the above
Q.15

What doestranslate to in binary?

  • 11000000
  • 00111110
  • 00001111
  • 00000011
  • None of the above
Q.16

What is the first octet range for a class A IP address?

  • 1 - 126
  • 192 - 255
  • 192 - 223
  • 1 - 127
  • 128 - 191
Q.17

Error detection at a data link level is achieved by

  • bit stuffing
  • cyclic redundancy codes
  • Hamming codes
  • equalization
  • None of the above
Q.18

RS-232-G

  • is an interface between two data circuit terminating equipment as examplified by a local and remote modem
  • is an interface standard between Data terminal Equipment and Data Circuit Terminating Equipment
  • specifies only the mechanical characteristics of an interface by providing a 25-pin connector
  • requires only 7 pin out of 25 in order to transmit digital data over public telephone lines
  • None of the above
Q.19

What is the main difference between DDCMP and SDLG?

  • DDCMP does not need special hardware to final the beginning of a message.
  • DDCMP has a message header
  • SDLC has a IP address
  • SDLC does not use CRC
  • None of the above
Q.20

In OSI network architecture, the routing is performed by

  • network layer
  • data link layer
  • transport layer
  • session layer
  • None of the above
Q.21

Parity bit is

  • an error-detecting code based on a summation operation performed on the bits to be checked.
  • a check bit appended to an array of binary digits to make the sum of all the binary digits.
  • a code in which each expression conforms to specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors in detected
  • the ratio of the number of data units in error to the total number of data units
  • None of the above
Q.22

Interconnected networks need communication processors such as switches, routers, hubs, and gateways. Select the best fit for answer:

  • TCP/IP
  • Protocol
  • Open Systems
  • Internetwork processor
Q.23

Which of the following is not a transmission medium?

  • telephone lines
  • coaxial cable
  • modem
  • microwave systems
  • satellite systems
Q.24

Which of the following statement is incorrect?

  • Gateways are assumed to know correct routes; hosts begin with minimal routing information and learn new routes from gateways.
  • Layered protocols are designed so that layer n at the destination receives exactly the same object sent by layer n at the source.
  • Application programs as well as all protocol software from the Internet layer upward use only IP addresses; the network interface layer handles physical addresses.
  • All of the above
  • None of the above
Q.25

Which of the following statement is incorrect?

  • The CCITT Recommendation X.25 specifies three layers of communication: physical, link and network.
  • The second layer of communication is the data-link layer
  • Errors in the physical layer can be detected by the data link layer
  • The fourth layer, in reference to the OSI model, is the session layer
  • None of the above
Q.26

How many digits of the DNIC (Data Network Identification Code) identify the country?

  • first three
  • first four
  • first five
  • first six
  • None of the above
Q.27

In geosynchronous orbit, satellite

  • remains in a fixed position so that as earth rotates, it can fully cover the earth
  • remains in a fixed position related to points on earth
  • moves faster than the earth's rotation so that it can cover larger portion of earth.
  • moves simultaneously
  • None of the above
Q.28

The area of coverage of a satellite radio beam is known as

  • Footprint
  • Circular polarization
  • Beam width
  • Identity
  • None of the above
Q.29

Alice is setting up a small network in her home so that she can study for her MCSE exams. She doesn't have a lot of money to spend on hardware, so she wants to use a network topology that requires the least amount of hardware possible. Which topology should she select?

  • Star
  • Right
  • Token-Ring
  • Ethernet
  • Bus
Q.30

ARP (Address Resolution Protocol) is

  • a TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address
  • a TCP/IP high level protocol for transferring files from one machine to another
  • a protocol used to monitor computers
  • a protocol that handles error and control messages
  • None of the above
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