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An organization is considering connecting a critical
PC-based system to the Internet. Which of the following
would provide the BEST protection against hacking?
A. An application-level gateway
B. A remote access server
C. A proxy server
D. Port scanning
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Answer: A
An application-level gateway is the best way to protect
against hacking because it can define with detail rules that
describe the type of user or connection that is, or is not
permitted. It analyzes in detail each package, not only in
layers one through four of the OSI model but also layers
five through seven, which means that it reviews the commands
of each higher level protocol (HTTP, FTP, SNMP, etc.) For a
remote access server there is a device (server) asking for
username and passwords before entering the network. This is
good when accessing private networks, but it can be mapped
or scanned from the Internet creating security exposure.
Proxy servers can provide protection based on the IP address
and ports. However, an individual is needed who really knows
how to do this, and second applications can use different
ports for the different sections of their program. Port
scanning works when there is a very specific task to do, but
not when trying to control what comes from the Internet (or
when all the ports available need to be controlled somehow).
For example, the port for "Ping" (echo request) could be
blocked and the IP addresses would be available for the
application and browsing, but would not respond to "Ping".
| Is This Answer Correct ? | 6 Yes | 0 No |
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