Layered Protocols and Protocol Chains
Windows Sockets 2 incorporates the concept of a layered protocol. A layered
protocol is one that implements only higher level communications functions while
relying on an underlying transport stack for the actual exchange of data with a
remote endpoint. An example of this type of layered protocol is a security
layer that adds a protocol to the socket connection process in order to perform
authentication and establish an encryption scheme. Such a security protocol
generally requires the services of an underlying, reliable transport protocol such
as TCP or SPX.
The term
base protocol refers to a protocol, such as TCP or SPX, that is fully capable of performing
data communications with a remote endpoint. A
layered protocol is a protocol that cannot stand alone, while a
protocol chain is one or more layered protocols strung together and anchored by a base
protocol.
A protocol chain is created by having the layered protocols support the
Windows Sockets 2 SPI at both their upper and lower edges. A special
WSAPROTOCOL_INFO structure is created that refers to the protocol chain as a whole, and that
describes the explicit order in which the layered protocols are joined. This is
illustrated in the figure
Layered Protocol Architecture. Since only base protocols and protocol chains are directly usable by
applications, they are the only ones listed when the installed protocols are
enumerated with the
WSAEnumProtocols function.
Layered Protocol Architecture
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