A critical function of a firewall is to act as a:
A. special router that connects the Internet to a LAN.
B. device for preventing authorized users from accessing the
LAN.
C. server used to connect authorized users to private
trusted network resources.
D. proxy server to increase the speed of access to
authorized users.
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Answer: B
A firewall is a set of related programs, located at a
network gateway server, that protects the resources of a
private network from users of other networks. An enterprise
with an intranet that allows its workers access to the wider
Internet installs a firewall to prevent outsiders from
accessing its own private data resources and for controlling
the outside resources to which its own users have access.
Basically, a firewall, working closely with a router
program, filters all network packets to determine whether or
not to forward them toward their destination. A firewall
includes or works with a proxy server that makes network
requests on behalf of workstation users. A firewall is often
installed in a specially designated computer separate from
the rest of the network so no incoming request can get
directed to private network resources.
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