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      Question

      What is 'QoS' (Quality of Service) in

      networking?
      A A security protocol that encrypts sensitive data to ensure data quality Correct Answer Incorrect Answer
      B A set of techniques to manage and prioritize network traffic to guarantee performance levels for critical applications Correct Answer Incorrect Answer
      C A software testing methodology ensuring application reliability Correct Answer Incorrect Answer
      D A hardware standard for network equipment reliability certification ensuring that all network equipment are fully reliable Correct Answer Incorrect Answer
      E A compliance framework for network audit quality Correct Answer Incorrect Answer

      Solution

      QoS classifies and prioritizes network traffic to ensure critical applications receive sufficient bandwidth and low latency. Techniques: traffic classification (DSCP markings), queuing (priority queuing, weighted fair queuing), traffic shaping, and policing. In banks, QoS ensures that core banking transactions (RTGS, NEFT, CBS) get higher priority than email or web browsing on the same network link. Without QoS, a large file download could saturate a branch WAN link and delay transaction processing.

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