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DIGITAL LOGIC AND DESIGN:
Scenario III describes a situation where requests travel only through a subset of the hierarchy. A top-level request can only move to the next lower level n-1 if this level can satisfy the request.
CS508 HIGHLIGHTED HANDOUTS
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CS302-DIGITAL LOGIC AND DESIGN
An example of this is when level N-1 acts as a cache and requests at level N can be satisfied. It is not sent up to layer 1 and from there to the remote server. Please note.
The caching layer maintains state information, while the layer that only forwards requests frequently Stateless person. Stateless layers have the advantage that they are generally easier to program.
CS302 HIGHLIGHTED HANDOUTS-DIGITAL LOGIC AND DESIGN
Regarding re-entry. Scenario IV describes a situation similar to Scenario III. However, an event detected in layer 1 stops at layer 3 instead of going all the way to layer N. In a communication protocol, e.g.
For example, there may be a resend request from an impatient customer who requested data some time ago.
Meanwhile, the server has already sent the reply, and the reply and request to resend Crotch.
CS302 HIGHLIGHTED HANDOUTS PDF-DIGITAL LOGIC AND DESIGN
In this case, Layer 3 on the server-side can notice this and intercept the resend request without further action. In the fifth scenario, two N-tier packets communicate with each other.
In this scenario Packets are known from the communication protocol known as the “protocol stack”. In the following graph, layer N on the left stack is issuing the request.
The request is Layers up to layer 1 are sent to the first layer in the stack on the right, where they move up.
Stack the layers to the right. The response to the request will follow the reverse path until then Access layer N on the left stack.