Basic CS [TCS Placement]: Sample Questions 76 - 76 of 196

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Question 76

Basic CS
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Describe in Detail

Essay▾

Define the terms unicast, multicast, and broadcast?

Explanation

Unicast

  • It is done from one source to one destination i.e.. One-to-One
  • For example, many streams of IP packets that move across networks flow from a single point, such as a website server, to a single endpoint such as a client PC.
  • Most common form of information transference on networks.

Multicast

  • It is from one source to multiple destinations i.e.. one-to-many
  • Only the destinations that openly accept the data from a specific source receive the traffic stream.
  • On an IP network, destinations (i.e.. clients) do not communicate straight to sources (i.e.. servers) - routers between source and destination must be able to regulate the topology of the network from unicast or multicast to avoid disordered routing traffic. Multicast routers replicate packets received on one input interface and send the replicas out on multiple output interfaces.
  • In the multicast model, the source and destinations are “host” and not “routers” .
  • The multicast traffic is spread by multicast routers across the network from source to destinations.
  • The multicast routers must find multicast sources on the network, send out copies of packets on a number of interfaces, avoid loops, connect interested destinations with accurate source, and keep the flow of unsolicited packets to a minimum.
  • Standard protocols provide most of these facilities, but some router architecture cannot send multiple copies of packets and so do not support direct multicasting.

Broadcast

  • These are from one source to all possible destinations i.e.. one-to-all- unlike multicast there is no option of “opting in”
  • Traffic streams from a single point to all possible endpoints within reach on the network, which is generally a LAN.
  • This is the easiest technique to ensure traffic reaches to its destinations.
  • This mode is mainly utilized by television- in a cable television (CATV) system; the source signal reaches to all possible destinations, which is the key reason that some channels՚ content is scrambled.
  • Broadcasting is not practicable on the public Internet due to the massive amount of unnecessary data that would continually reach at each user՚s device, the complications and impact of scrambling and related privacy issues.
Given the Image is Define the IP Services Are Unicast, Broadcast and Multicast

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