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Two Contending Network Layer Schemes

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From: ANONYMOUS
Date: Sun 7th Jun, 2:03pm
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Hi Chris, 

Hope you are well. I am struggling with this question I found. It says:


Consider the delivery of messages in an internetworked environment in which the 
source and destination nodes are many hops apart. Large messages must be fragmented 
and reassembled using one of two possible approaches.
 							
The first approach involves fragmenting each message at the source node, and then 
reassembling them at the destination node.
 							
The second approach involves fragmenting each message at the source node, 
reassembling and re-fragmenting them at intermediate nodes, and final reassembly at 
the destination node.
 							
With reference to two distinct examples, describe circumstances where each of the 
methods would be preferred over the other.



Is it asking us to reference the two contending network layer schemes (Lecture 6, 
p7)? 

Any assistance is appreciated. 

Two Contending Network Layer Schemes

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From: Christopher M.
Date: Mon 8th Jun, 4:58am
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ANONYMOUS wrote:

> Is it asking us to reference the two contending network layer schemes (Lecture 6, 
> p7)? 
> 
> Any assistance is appreciated. 

Not specifically about that page.
But the question is asking about two approaches to fragmentation, one which fragments and re-
assembles at the ends, and the other which fragments and re-assembles at each node it passes 
through.   You may like to include discussion about the two schemes summarised on that p7, by 
thinking about:

- would each approach to fragmentation be even possible with each network layer routing scheme?

- would there need to be any constraints on the routing scheme to support either form of 
fragmentation?

- would either routing scheme be more efficient (in space and time) than the other, for each 
particular type of fragmentation?

Hope that helps,
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