TCS Papers: Sample Questions 202 - 203 of 502

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Question number: 202

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is TDM?

Explanation

  • Time-division multiplexing (TDM) puts multiple data streams in a single signal by separating the signal into many segments, each having a very short duration. Data stream is reassembled at the receiving end based on the timing.

  • Circuit combining the signals at the source (transmitting) is known as a multiplexer- it breaks signal into segments, and assigns the segments to the composite signal in a rotating, repeating sequence.

  • The composite signal contains data from multiple senders. At the other end, individual signals are separated using a demultiplexer, and routed to the proper end users.

  • This process does not increase the net bandwidth but only allows multiple users or streams to use the link simultaneously. TDM thus provides flexibility.

  • In Internet for example, volume of traffic can change drastically from hour to hour.

Image shows the TDM

Image Shows the TDM

Given the image is define the time division multiplexing (TDM)

Question number: 203

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is IGP (Interior Gateway Protocol)?

Explanation

  • Interior Gateway Protocol (IGP) is a dynamic class routing protocol used by autonomous system routers running on TCP/IP hosts.

  • It is composed of routing protocols that are used within the autonomous system and usually runs within the LAN.

  • IGP overcomes Routing Information Protocol (RIP) network limitations and supports multiple routing metrics, including delay, bandwidth, load and reliability.

  • Routers use IGP when exchanging Internet Protocol data. A single adjustable formula combines for route comparison and creates IGP metrics.

  • Two IGP types are:

    • Distance-Vector Routing Protocol (DVRP) : Uses the Bellman-Ford algorithm. For examples RIP, Interior Gateway Routing Protocol and Enhanced Interior Gateway Routing Protocol.

    • Link State Routing Protocol (LSRP) : Each router has access to all network topology data via the routing table. LSRP node transfers are used to construct connectivity maps. Examples include Open Shortest Path First and Intermediate System-to-Intermediate System protocols.

The Interior Gateway Protocol (IGP)

The Interior Gateway Protocol (IGP)

The Interior Gateway Protocol (IGP)