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Datagram Reassembly and Fragmentation

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Questions and Answers

What indicates that a fragment is the final piece of data in the reassembly process?

The fragment has a size equal to the maximum MTU.

The fragment has the flag bit set to (0) in the header. (correct)

The fragment is the first one received by the destination host.

The fragment carries the flag bit set to (1) in the header.

Why should only the final destination host reassemble fragments?

Other hosts may modify the fragments during transmission.

Other hosts do not carry the necessary processing resources.

Fragmentation is only allowed at the originating source.

Reassembly requires knowledge of all fragments which only the destination has. (correct)

What happens when a fragment reaches a network with a smaller MTU?

It can cause fragmentation of the fragment. (correct)

The fragment is discarded by the receiving node.

No action is taken as MTU size does not affect fragments.

The fragment will be sent directly to the final destination unmodified.

What does the term 'fragmenting a fragment' refer to?

<p>Dividing a previously fragmented piece into smaller parts. (B)</p> Signup and view all the answers

What role does reassembly play in the context of data fragments?

<p>It reconstructs the original datagram from its fragments. (C)</p> Signup and view all the answers

Flashcards

Datagram Reassembly

The process of combining fragmented datagrams back into the original datagram.

Fragment Flag Bit

A flag bit in the header of a fragment indicates whether it's the last piece of the original datagram.

Why only Destination Reassembles

Only the final destination host should reassemble fragments because it's responsible for the complete datagram.

Fragmenting a Fragment

If a fragment encounters a network with a smaller MTU, it might need further fragmentation.

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Fragmenting a Fragment - Is it possible?

Yes, it's possible to fragment a fragment if it encounters a network with an even smaller MTU.

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Study Notes

Datagram Reassembly

Datagram reassembly reconstructs the original datagram from its fragmented parts.
The fragment containing the last piece of data has its flag bit set to 0 in the header, signaling the receiver about a complete arrival.
Only the final destination host reassembles fragments. This prevents intermediate networks from handling the complex process unnecessarily.

Fragment Fragmentation

If a fragment enters a network with smaller Maximum Transmission Unit (MTU) requirements, further fragmentation might be necessary.
It's possible to fragment a fragment, meaning one fragment can be broken down into smaller fragments for transmission.

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Description

This quiz covers the concepts of datagram reassembly and fragmentation within network communications. Learn how fragmented data is reconstructed and the implications of Maximum Transmission Unit (MTU) requirements during the transmission process. Test your understanding of these essential networking topics.