Basic CS-Networks [TCS Placement]: Sample Questions 104 - 105 of 133

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Question 104


Describe in Detail


Explain rule


  • The rule is a guideline for design of shared Ethernet networks for optimal traffic flow- refers to the number of repeaters and segments present on shared Ethernet backbones for tree topology.
  • It means that between any two points on the network, there can be no more than five network segments or four repeaters, and of those five segments only three of segments can be populated.
  • The rule comes because each repeater and segment adds a delay in the process and Ethernet protocol dictates that packets reach every part on its path toward its destination within a specified length of time.
  • mbps Ethernet could be used on no more than network segments, repeaters, and no more than of the five network segments can be for end users.
Given the Image is Define the Ethernet 5 - 4-3 Rule

Question 105


Describe in Detail


What are the responsibilities of Session Layer?


The Session layer is network dialog controller- establishes, maintains, and synchronizes interaction between the communicating systems.

  • Dialog control

    Allows two systems to start communication with each other in half-duplex or full duplex.

  • Synchronization
    • Allows a process to add checkpoints considered the synchronization points into stream of data.
    • Example: If a system is sending a file of 800 pages, adding checkpoints after every 50 pages is recommended. This ensures that 50-page unit is successfully received and acknowledged. This is beneficial at the time of crash as if a crash happens at page number 110; there is no need to retransmit pages 1 to100.

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