(CIS 175 -Intro 2 Ntwrking) Week 4 HW

(CIS 175 -Intro 2 Ntwrking) Week 4 HW - Framing adds...

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Well Done. Thank you :) Week 4 HW 1. Identify and define the two types of errors? They first type of error is a single-bit. This is where only one bit of data is changed from 1 to 0 or vise-versa. A burst error, the second type, is where more than one bit of data is changed from 1 to 0 or vise-versa. 2. Describe the value of detection versus correction? In detection, we just need to know ‘if’ an error occurred. Codewords are used to do this. The number and type of error isn’t important. However, in error correction, it is important to know the number of errors and where they are in the message. The receiver must find the original codeword that was sent. The bigger the message, then the more difficulty there is involved with finding them. 3. Define the following and identify. a. Framing data – this is the organization of the bits in the data to be carried by the physical layer.
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Unformatted text preview: Framing adds addresses for the sender and receiver. They can be fixed or variable sized, which can have much to do with the amount of errors (how many frames are affected.) b. Flow control – this defines how much data can be sent before it must receive an acknowledgement from the receiver. The data mustn’t overwhelm the receiver. c. Error control – this is both error detection and correction. Because of this, the receiver can tell the sender of damaged frames and organize a way to get them back correctly. 4. Explain the concept of acknowledgement and negative acknolowedgement. An acknowledgement is a message sent back to the receiver to let it know the message was sent correctly. Negative acknowledgment is a message transmitted to indicate that some data has been received incorrectly...
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This note was uploaded on 01/19/2012 for the course COMPUTER S 100 taught by Professor Brown during the Spring '11 term at Strayer.

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