TCS Papers: Sample Questions 427 - 428 of 502

Examrace Placement Series prepares you for the toughest placement exams to top companies.

Question number: 427

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is Synchronous TDM?

Explanation

  • In STDM, the multiplexer allocates exactly the same time slot to each device at all times, whether or not a device has anything to transmit.

  • This time slice is allocated even if a device has nothing to transmit and hence is wasteful.

  • Synchronous TDM thus does not maximize line usage and efficiency.

Synchronous TDM

Synchronous TDM

Given the image is define the Synchronous time division multiplexing

Question number: 428

» Basic CS » Networks

Essay Question▾

Describe in Detail

What is EGP (Exterior Gateway Protocol)?

Explanation

  • Exterior Gateway Protocol (EGP) exchanges routing information between two neighbor gateway hosts (each with its own router) in a network of autonomous systems.

  • Interior Gateway Protocols are used within a domain, EGP allows neighboring routers in different domains to share information.

  • Commonly used between hosts on the Internet to exchange routing table information.

  • Routing table contains a list of known routers, the addresses they can reach, and a cost metric associated with the path to each router to select best available route.

  • EGP is based on periodic message exchange polling for neighbor reachability and commands to request update responses. Each router polls its neighbor at intervals between seconds and neighbor responds by sending its complete routing table. EGP-2 is the latest version of EGP.

  • The EGP model is built with finite event, action and transition automation.

  • EGP mechanisms are:

    • Acquire neighbors

    • Monitor neighbors

    • Exchange data as update messages

  • Recent exterior gateway protocol, the Border Gateway Protocol (BGP), provides additional capabilities. EGP is documented in RFC , which was published in April of 1984. Prior to the introduction of BGP, Internet hosts used EGP for data table routing exchanges.

Exterior Gateway Protocol

Exterior Gateway Protocol

Exterior Gateway Protocol