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    Availability and Reliability

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    1 Page or less answers for each in short answers to explain the difference between:

    Availability and reliability

    Response time and throughput

    Throughput and bandwidth

    SNMP and RMON

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    Availability and reliability
    Reliability is the ability of a device or system to perform its function without failure when called upon to do so. Availability means the system is ready for immediate use. Airplanes, for example, must be very reliable, while in the air, but aren't expected to fly 24 hours a day. Reliable components certainly contribute to having a reliable network, but network availability is also controlled by other factors, including how rapidly a network can recover from a failure.

    Mean time between failure (MTBF) is a common unit to measure reliability. MTBF is the average expected interval between failures of a product in steady state. As an illustration, some circuit cards are typically designed and tested for an MTBF of 100,000 hours or more, or as high as 200,000 hours for simple designs with few components.

    Mean time to repair (MTTR) is the second key factor that determines network availability. MTTR is the average time it takes the operations staff (internal staff, service provider staff, or both) to diagnose, isolate, remove, and replace the failed part, and then restore full functionality to the network. Dispatch and travel time, if required, are included. "Repair time" doesn't always involve people. Some products have been designed to detect a problem, switchover to a different piece of hardware or a different instance of ...