Basic CS-Networks [TCS Placement]: Sample Questions 3 - 4 of 133

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Question 3


Describe in Detail


What is VRC?


  • VRC or vertical redundancy check or the partial check is least expensive mechanism for error detection.
  • The redundant bit called parity bit is appended to every data unit so that the total number of 1՚s in the unit becomes even.
Given the Image is Defining the Vertical Redundancy Check
  • VRC can detect all single bit error
  • Can detect burst errors if the total number of errors in each data unit is odd.
  • VRC can՚t detect errors where the total number of bits changed is even.

Question 4


Write in Short

Short Answer▾

What is SAP?


  • SAP or Series of interface points allow computers to communicate with the other layers of network protocol stack.
  • The Service Access Point identify the protocol handler which should process an incoming frame.
  • Service Access Point is a data structure identifier for a buffer area in system memory.
  • The Open Systems Interconnect (OSI) model uses a SAP to define the communication between layers (like Network, Transport, Session, and the other layers of the Seven-Layered Model) .
  • Source Service Access Point (SSAP) or a Destination Service Access Point (DSAP) refer to the boundary between the Data Link Layer and the Network Layer.

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