Netgear WGE111 사용자 설명서

C-10

Wireless Networking Basics

WPA is a subset of the current 802.11i draft and uses certain pieces of the 802.11i draft that are 
ready to bring to market today, such as 802.1x and TKIP. The main pieces of the 802.11i draft that 
are not included in WPA are secure IBSS (Ad Hoc mode), secure fast handoff (for specialized 
802.11 VoIP phones), as well as enhanced encryption protocols, such as AES-CCMP. These 
features are either not yet ready for market or will require hardware upgrades to implement. 

The following security features are included in the WPA standard: 

•

WPA Authentication

•

WPA Encryption Key Management

–

Temporal Key Integrity Protocol (TKIP)

–

Michael message integrity code (MIC)

–

AES Support (to be phased in)

•

Support for a Mixture of WPA and WEP Wireless Clients, but mixing WEP and WPA is 
discouraged

These features are discussed below.

WPA addresses most of the known WEP vulnerabilities and is primarily intended for wireless 
infrastructure networks as found in the enterprise. This infrastructure includes stations, access 
points, and authentication servers (typically RADIUS servers). The RADIUS server holds (or has 
access to) user credentials (for example, user names and passwords) and authenticates wireless 
users before they gain access to the network.

The strength of WPA comes from an integrated sequence of operations that encompass 802.1X/
EAP authentication and sophisticated key management and encryption techniques. Its major 
operations include:

•

Network security capability determination. This occurs at the 802.11 level and is 
communicated through WPA information elements in Beacon, Probe Response, and (Re) 
Association Requests. Information in these elements includes the authentication method 
(802.1X or Pre-shared key) and the preferred cipher suite (WEP, TKIP, or AES).