Layer
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... routing and forwarding of requests and
responses for content. Content Networks rely on layer 7 protocols
such as HTTP [4 ...
... DNS based Request-Routing techniques. Section 3 discusses
transport-layer Request-Routing methods. In section 4 application
layer ...
... transport-layer Request-Routing methods. In section 4 application
layer Request-Routing mechanisms are explored. Section 5 provides
insight on combining the various methods ...
... Transport-Layer Request-Routing ...
...
At the transport-layer finer levels of granularity can be achieved by
the close inspection of client's requests. In this approach, the
...
... about the client's IP address, port information, and layer 4
protocol. The acquired data could be used in combination with
user-defined policies and other metrics to determine the selection of
...
... methods could
be used as a first step in deciding on an appropriate surrogate with
more accurate refinement made by the transport-layer Request-Routing
system.
...
... Application-Layer Request-Routing ...
... Routing systems perform deeper examination
of client's packets beyond the transport layer header. Deeper
examination of client ...
... exposure to the client's IP address combined with the fine-grained
knowledge of the requested objects enable application-layer
Request-Routing systems to provide better control over the selection
...