Which of the following CANNOT be performed by a proxy server?
A.
Network Address Translation.
B.
Web page caching.
C.
Packet filtering.
D.
Data encryption.
Explanation:
A proxy server does not provide data encryption.
Incorrect Answers:
A: A proxy server also hides the IP addresses of all hosts on the internal network by replacing the private IP address of any requesting host with its own public IP address.
Thus providing Network Address Translation.
B: A proxy server caches web pages for future retrieval, allowing a user’s request to be filled quicker and reducing Internet traffic.
C: A proxy server inspects the entire packet and can be configured to filter packets that pass through it based on a number of criteria.
Reference:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 12.
David Groth and Toby Skandier, Network+ Study Guide (4th Edition), Sybex, Alameda CA, 2005, pp. 134-13, 142-144.