Packet Filtering Firewalls can also enable access for:

The correct answer is A. only authorized application port or service numbers. Firewall rules can be used to enable access for traffic to specific ports or services. "Service numbers" is rather stilted English but you may encounter these types of wordings on the actual exam -- don't let them confuse you. "Only unauthorized application port or service…

Submitted by chen.hong· Apr 18, 2026Network and Communications Security

Question

Options

Aonly authorized application port or service numbers.
Bonly unauthorized application port or service numbers.
Conly authorized application port or ex-service numbers.
Donly authorized application port or service integers.

How the community answered

(24 responses)

A
92% (22)
B
4% (1)
C
4% (1)

Explanation

Firewall rules can be used to enable access for traffic to specific ports or services. "Service numbers" is rather stilted English but you may encounter these types of wordings on the actual exam -- don't let them confuse you. "Only unauthorized application port or service numbers" is incorrect. Unauthorized ports/services would be blocked in a properly installed firewall rather than permitting access. "Only authorized application port or ex-service numbers" is incorrect. "Ex-service" numbers is a nonsense term meant to distract you. "Only authorized application port or service integers." While service numbers are in fact integers, the more usual (and therefore better) answer is either service or "service number."

Topics

#Firewalls#Packet Filtering#Network Security#Ports and Services

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