5) CWNPCert: Wireless LAN Administration

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Objective: 802.11 Network Security
SubObjective: 802.11 Network Security Architecture

Single Answer Multiple Choice

Which of the following is NOT a known weakness of WEP?

A. WEP does not encrypt the IP and TCP headers, only the data
B. WEP does not protect against replay attacks
C. WEP does not protect against forgeries
D. WEP does not natively provide a way to centrally manage the keys

Answer:
A. WEP does not encrypt the IP and TCP headers, only the data

Tutorial:
WEP is a Layer 2 encryption. WEP encrypts everything above Layer 2. This would include items on Layer 3 and Layer 4, such as IP headers and TCP headers.

WEP does not protect against replay attacks. TKIP uses sequencing via the Transmit Sequence Counter (TSC) to protect against replay

WEP does not protect against forgeries. The linear CRC has been shown to be susceptible to manipulation of the data without detection. The non-linear Message Integrity Check (MIC) in TKIP protects against forgeries.

WEP does not natively provide a way to manage the keys centrally. They must be updated manually when they are changed.

Reference:
CWNA Study Guide Revision 3, pp. 426-429.

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