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Layer 7 devices used to prevent specific types of html …

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

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A.
Firewalls

B.
Content filters

C.
Routers

D.
NIDS

Explanation:
A content filter is a type of software designed to restrict or control the content a reader is authorized 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 OSImodel.

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

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