Which layer of the OSI/RM do proxy servers usually address?

A.
Physical layer
B.
Network layer
C.
Transport layer
1D0-470
D.
Application layer
Explanation:
Most proxy servers, for example proxy server firewalls, work at the application layer.
Incorrect Answers:
A: A proxy server does not work usually work at the physical layer.
B: A proxy server could work at the network layer, but it is usually run at the application layer.
C: A proxy server could work at the transport layer, but it is usually run at the application layer.
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