Which of the following statements regarding a proxy server are TRUE? (Choose all that apply)
A.
A proxy server is a type of firewall that completely separates packets from internal hosts and from external hosts.
B.
A proxy server connects two dissimilar networks by providing Network Address Translation.
C.
A proxy server operates at the lower layers of the OSI reference model.
D.
A proxy server can cache frequently accessed Web pages and can increase network security by filtering out Web content that is considered insecure, such as executables, scripts, or viruses.
Explanation:
A proxy server caches web pages for future retrieval, allowing a user’s request to be filled quicker and reducing Internet traffic. 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.Incorrect Answers:
B: A proxy server can provide Network Address Translation but it connects an LAN to the Internet, not to a dissimilar network.
C: A proxy server operates at the Application Layer of the OSI.
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.