Users report that they are unable to access network printing services. The security technician checks the router
access list and sees that web, email, and secure shell are allowed. Which of the following is blocking network
printing?

A.
Port security

B.
Flood guards

C.
Loop protection

D.
Implicit deny

Explanation:
Implicit deny says that if you aren’t explicitly granted access or privileges for a resource, you’re denied access
by default. The scenario does not state that network printing is allowed in the router access list, therefore, it
must be denied by default.