Comptia Security Plus Mock Test Q24

Layer 7 devices used to prevent specific types of html tags are called:

A. Firewalls
B. Content filters
C. Routers
D. NIDS

Correct Answer: B
Section: Network Security

Explanation:
A content filter is a type of software designed to restrict or control the content a reader is authorised to access, particularly when used to limit material delivered over the Internet via the Web, e-mail, or other means. Because the user and the OSI layer interact directly with the content filter, it operates at Layer 7 of the OSI model.

Incorrect Answers:
A, C, D: These devices deal with controlling how devices in a network gain access to data and permission to transmit it, as well as controlling error checking and packet
synchronization. It, therefore, operates at Layer 2 of the OSI model.

References:
http://en.wikipedia.org/wiki/Content-control_software#Types_of_filtering
http://en.wikipedia.org/wiki/OSI_model