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Packet Filtering Firewalls can also enable access for:

Packet Filtering Firewalls can also enable access for:

PrepAway - Latest Free Exam Questions & Answers

A.
only authorized application port or service numbers.

B.
only unauthorized application port or service numbers.

C.
only authorized application port or ex-service numbers.

D.
only authorized application port or service integers.

Explanation:
Packet filtering is a firewall technology that makes access decisions based upon network-level protocol header
values. The filters can make access decisions based upon the following basic criteria:
Source and destination port numbers (such as an application port or a service number)
Protocol types
Source and destination IP addresses
Inbound and outbound traffic direction
Incorrect Answers:
B: Only authorized ports or service numbers, not unauthorized, would be granted access through the firewall.
C: Packet Filtering Firewalls do not grant access through ex-service numbers. They use service numbers.
D: Packet Filtering Firewalls do not grant access through service integers. A service has a number, not an
integer.

Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, New York, 2013, p. 630


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