- In the OSI model, as a data packet moves from the lower to the upper layers, headers are _______.
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added
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removed
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rearranged
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modified
As data packets move from lower to upper layers in the OSI model, headers are removed during decapsulation (encapsulation reversal). Each layer removes the header added by its corresponding layer on the sending side. Option A (added) describes the sending direction, while options C and D are incorrect.
To answer this question, we need to understand the OSI model and how data packets are processed as they move up the layers.
In the OSI model, data communication is divided into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application. Each layer has a specific purpose and performs certain functions.
As a data packet moves from the lower to the upper layers of the OSI model, headers are removed. The lower layers (Physical, Data Link, and Network) add headers to the data packets as they encapsulate the data. However, as the packet moves up the layers, the headers added by the lower layers are stripped off at each layer. This process is known as header removal or header stripping.
Option A) Added - This option is incorrect because headers are not added as the data packet moves up the layers. Headers are added by the lower layers and removed by the upper layers.
Option B) Removed - This option is correct because headers are indeed removed as the data packet moves up the layers.
Option C) Rearranged - This option is incorrect because headers are not rearranged as the data packet moves up the layers. They are simply removed.
Option D) Modified - This option is incorrect because headers are not modified as the data packet moves up the layers. They are only removed.
Therefore, the correct answer is B) Removed. Headers are removed as a data packet moves from the lower to the upper layers of the OSI model.