Motorola AP 5131 - Wireless Access Point, Руководство по продукции, Страница: 27 / 698

Introduction 1-11
1.2.8.6 WPA2-CCMP (802.11i) Encryption
WPA2 is a newer 802.11i standard that provides even stronger wireless security than Wi-Fi Protected
Access (WPA) and WEP. Counter-mode/CBC-MAC Protocol (CCMP) is the security standard used by
the Advanced Encryption Standard (AES). AES serves the same function TKIP does for WPA-TKIP.
CCMP computes a Message Integrity Check (MIC) using the proven Cipher Block Message
Authentication Code (CBC-MAC) technique. Changing just one bit in a message produces a totally
different result.
WPA2-CCMP is based on the concept of a Robust Security Network (RSN), which defines a hierarchy
of keys with a limited lifetime (similar to TKIP). Like TKIP, the keys the administrator provides are used
to derive other keys. Messages are encrypted using a 128-bit secret key and a 128-bit block of data.
The end result is an encryption scheme as secure as any the provides.
For detailed information on WPA2-CCMP, see Configuring WPA2-CCMP (802.11i) on page 6-24 .
1.2.8.7 Firewall Security
A firewall keeps personal data in and hackers out. The firewall prevents suspicious Internet traffic
from proliferating the access point managed network. The access point performs
network address
translation (NAT) on packets passing to and from the WAN port. This combination provides enhanced
security by monitoring communication with the wired network.
For detailed information on configuring the access point’s firewall, see Configuring Firewall Settings
on page 6-27 .
1.2.8.8 VPN Tunnels
Virtual Private Networks (VPNs) are IP-based networks using encryption and tunneling providing
users remote access to a secure LAN. In essence, the trust relationship is extended from one LAN
across the public network to another LAN, without sacrificing security. A VPN behaves like a private
network; however, because the data travels through the public network, it needs several layers of
security. The can function as a robust VPN gateway.
For detailed information on configuring VPN security support, see Configuring VPN Tunnels on page
6-36 .
1.2.8.9 Content Filtering
Content filtering allows system administrators to block specific commands and URL extensions from
going out through the WAN port. Therefore, content filtering affords system administrators selective
control on the content proliferating the network and is a powerful screening tool. Content filtering