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GIAC GSNA Exam - Topic 1 Question 82 Discussion

Posted by Lai on Apr 02, 2026 at 10:31 AM

Which of the following are the countermeasures against WEP cracking?

Each correct answer represents a part of the solution. Choose all that apply.

Suggested Answer: A, B, C

A user can use some countermeasures to prevent WEP cracking. Although WEP is least secure, it should not be used. However, a user can

use the following methods to mitigate WEP cracking:

Use a non-obvious key.

Use the longest key supported by hardware.

Change keys often.

Use WEP in combination with other security features, such as rapid WEP key rotation and dynamic keying using 802.1x.

Consider WEP a deterrent, not a guarantee.

Answer D is incorrect. SSID stands for Service Set Identifier. It is used to identify a wireless network. SSIDs are case sensitive text

strings and have a maximum length of 32 characters. All wireless devices on a wireless network must have the same SSID in order to

communicate with each other.

The SSID on computers and the devices in WLAN can be set manually and automatically. Configuring the same SSID as that of the other

Wireless Access Points (WAPs) of other networks will create a conflict.

A network administrator often uses a public SSID that is set on the access point. The access point broadcasts SSID to all wireless devices

within its range. Some newer wireless access points have the ability to disable the automatic SSID broadcast feature in order to improve

network security.


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12 comments · newest first
GA
Gaynell 3 months ago
Definitely A and B. D is not a good choice; 16-bit SSIDs are too weak.
JI
Jin 3 months ago
I agree, A and B. But C is also important. Non-obvious keys can confuse attackers.
KY
Kyoko 3 months ago
I think A and B are crucial. Longer keys and frequent changes help a lot.
MA
Malinda 3 months ago
I thought using a longer key was enough, but I guess there's more to it!
MI
Milly 3 months ago
Wait, changing keys often? Isn't that a hassle?
KR
Kristine 4 months ago
D) is not a countermeasure, that's just bad advice.
IV
Ivory 5 months ago
C) is a must too, can't believe people still use obvious keys.
SO
Solange 5 months ago
A) and B) are definitely good practices!
MA
Mauricio 6 months ago
I don't think using a 16 bit SSID is a countermeasure against WEP cracking, but I could be wrong.
AI
Ailene 6 months ago
I feel like using a non-obvious key is also a common recommendation, but I can't recall if it was specifically mentioned in our study materials.
AL
Almeta 6 months ago
I remember practicing questions about WEP security, and changing keys often seemed important.
LA
Laurena 6 months ago
I think using the longest key supported by hardware is definitely a good idea, but I'm not sure about the others.
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