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
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.
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.