Radio Frequency Ranges; Security For Communications In Wlans; Authentication Methods - Cisco 8821 Administration Manual

VoIP Networks
For more information on enabling World mode and 2.4 GHz support, see the Cisco Wireless IP Phone 8821
Series Deployment Guide.
Enable World mode (802.11d) for the corresponding country where the access point is located. World mode
is enabled automatically for the Cisco Unified Wireless LAN Controller.

Radio Frequency Ranges

WLAN communications use the following radio frequency (RF) ranges:
• 2.4 GHz: Many devices that use 2.4 GHz can potentially interfere with the 802.11b/g connection.
• 5 GHz: This range divides into several sections called Unlicensed National Information Infrastructure

Security for Communications in WLANs

Because all WLAN devices that are within range can receive all other WLAN traffic, security of voice
communications is critical in WLANs. To ensure that intruders do not manipulate or intercept voice traffic,
the Cisco SAFE Security Architecture supports wireless phones and Cisco Aironet APs. For more information
about security in networks, see
index.html.

Authentication Methods

The Cisco Wireless IP Telephony solution provides wireless network security that prevents unauthorized
sign-ins and compromised communications through use of the following authentication methods that wireless
phones support:
• WLAN Authentication
• WLAN Encryption
Interference can produce a Denial of Service (DoS) scenario, which may prevent successful 802.11
transmissions.
(UNII) bands, each of which has four channels. The channels are spaced at 20 MHz to provide
nonoverlapping channels and more channels than 2.4 GHz provides.
http://www.cisco.com/c/en/us/solutions/enterprise/design-zone-security/
◦ WPA (802.1x authentication + TKIP or AES encryption)
◦ WPA2 (802.1x authentication + AES or TKIP encryption)
◦ WPA-PSK (Pre-Shared key + TKIP encryption)
◦ WPA2-PSK (Pre-Shared key + AES encryption)
◦EAP-FAST (Extensible Authentication Protocol – Flexible Authentication via Secure Tunneling)
◦EAP-TLS (Extensible Authentication Protocol – Transport Layer Security)
◦ PEAP (Protected Extensible Authentication Protocol) MS-CHAPv2 and GTC
◦ CCKM (Cisco Centralized Key Management)
◦ Open (None)
Cisco Wireless IP Phone 8821 and 8821-EX Administration Guide for Cisco Unified Communications Manager
Radio Frequency Ranges
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