Cisco 7941G Administration Guide - Page 25

Chapter 1 An Overview of the Cisco Unified IP Phone What Networking Protocols are Used? Table 1-1 Supported Networking Protocols on the Cisco Unified IP Phone (continued) Networking Protocol Hypertext Transfer Protocol (HTTP) IEEE 802.1X Internet Protocol (IP) Link Layer Discovery Protocol (LLDP) Purpose Usage Notes HTTP is the standard way of transferring information and moving documents across the Internet and the web. Cisco Unified IP Phones use HTTP for the XML services and for troubleshooting purposes. The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized clients from connecting to a LAN through publicly accessible ports. Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL) traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass through the port. The Cisco Unified IP Phone implements the IEEE 802.1X standard by providing support for the EAP-MD5 option for 802.1X authentication. When 802.1X authentication is enabled on the phone, you should disable the PC port and voice VLAN. Refer to the "Supporting 802.1X Authentication on Cisco Unified IP Phones" section on page 1-23 for additional information. IP is a messaging protocol that addresses and sends packets across the network. To communicate using IP, network devices must have an assigned IP address, subnet, and gateway. IP addresses, subnets, and gateways identifications are automatically assigned if you are using the Cisco Unified IP Phone with Dynamic Host Configuration Protocol (DHCP). If you are not using DHCP, you must manually assign these properties to each phone locally. LLDP is a standardized network discovery protocol (similar to CDP) that is supported on some Cisco and third-party devices. The Cisco Unified IP Phone supports LLDP on the PC port. Cisco Unified IP Phone 7961G/7961G-GE and 7941G/7941G-GE for Cisco Unified Communications Manager 6.1 OL-14620-01 1-7