Basic CS-Networks [TCS Placement]: Sample Questions 72 - 73 of 133

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Question 72

Networks
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Describe in Detail

Essay▾

What are the responsibilities of Network Layer?

Explanation

Network Layer is responsible for the source-to-destination delivery of packet possibly across multiple networks (links) . It provides following functions:

  • Logical Addressing
    • It translates logical network address into physical address.
    • Concerned with circuit, message, or packet switching.
  • Routing
    • Routers and gateways operate in the network layer.
    • Network Layer routes the packets to final destination.
  • Provides connection services including network layer flow-control, network layer error-control, and packet sequence control.
  • Breaks larger packets into small packets.

Question 73

Networks
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Describe in Detail

Essay▾

What are the types of transmission media?

Explanation

Signals are transmitted over transmission media broadly classified into two categories.

Guided or Bounded Media

  • Bounded media are made up of external conductor bounded by jacket material.
  • Provides a conduit from one device to another that include twisted-pair, coaxial cable and fiber-optic cable.
  • Signal traveling along any of these media is directed and contained by the physical limits of the medium.
  • Twisted-pair and coaxial cable are metallic and transport signals in the form of electrical current.
  • Optical fiber is a glass or plastic cable that accepts and transports light signals.

Unguided Media

  • Refers to wireless media that transports electromagnetic waves without a physical conductor.
  • Done through radio communication, satellite communication, and cellular telephony.
  • Wireless transmission can be used in both LAN and WAN.
  • Some of them are point-to-point antennas while others are omni-directional antennas.
  • Even satellites act as giant antennas receiving and transmitting signals generated from the earth.
  • Wi-Fi, wi-max, 3g are example wireless networks used for internet communication.
Given the Image is Defining the Transmission Media That Are Classified in to Two Categories

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