COMPUTER NETWORKS AND COMMUNICATIONS
NETWORK PROTOCOLS AND STANDARDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ensure that all the data has arrived and is not corrupted
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ensure that the packet has been sent to the right place
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tell the computer what protocols were used
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ensure that the user is logged on
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Detailed explanation-1: -Checksum. A block of data is sent alongside a calculated checksum value. The receiving computer also calculates what it believes should be the checksum. The checksum values are then compared to see if an error has occurred during transmission.
Detailed explanation-2: -A checksum is an error-detection method in a the transmitter computes a numerical value according to the number of set or unset bits in a message and sends it along with each message frame. At the receiver end, the same checksum function (formula) is applied to the message frame to retrieve the numerical value.
Detailed explanation-3: -A 16-bit sum-of-words checksum will detect all single bit errors and all error bursts of length 16 bits or fewer. It will also detect 99.998% of longer error bursts. A 32-bit sum will detect even more errors.