Which function is NOT a characteristic feature of proxy servers?

A.
Making requests in the Internet, using HTTP, FTP, SOCKS on behalf of other clients
B.
IP Masquerading – replacing original requestor’s address with it’s own
C.
Encapsulating one protocol into another protocol
D.
Caching previously requested resources
Explanation:
B
answer is C
The answer is obviously C.
IP masquerading and NAT are among the basic functions of any proxy. However, packet encapsulation is not a proxy feature (although any interface card in any device needs to do that in order to deliver the traffic, but it is not a proxy feature)