Specifications

Chapter 3 Configuring Ethernet Switching
Managing the Catalyst 4224 Access Gateway Switch
3-14
Catalyst 4224 Access Gateway Switch Software Configuration Guide
OL-2031-02
IP defines a hierarchical naming scheme that allows a device to be identified by
its location or domain. Domain names are pieced together with periods (.) as the
delimiting characters. For example, Cisco Systems is a commercial organization
that IP identifies by a com domain name, so its domain name is cisco.com. A
specific device in this domain, such as the File Transfer Protocol (FTP) system,
is identified as ftp.cisco.com.
To track domain names, IP has defined the concept of a domain name server
(DNS), whose purpose is to hold a cache (or database) of names mapped to
IP addresses. To map domain names to IP addresses, you must first identify the
host names and then specify a name server and enable the DNS, the Internet’s
global naming scheme that uniquely identifies network devices.
Specifying the Domain Name
You can specify a default domain name that the software uses to complete domain
name requests. You can specify either a single domain name or a list of domain
names. When you specify a domain name, any IP host name without a domain
name will have that domain name appended to it before being added to the host
table.
Specifying a Name Server
You can specify up to six hosts that can function as a name server to supply name
information for the DNS.
Enabling the DNS
If your network devices require connectivity with devices in networks for which
you do not control name assignment, you can assign device names that uniquely
identify your devices within the entire internetwork. The Internet’s global naming
scheme, the DNS, accomplishes this task. This service is enabled by default.
Configuring Voice Ports
The Catalyst 4224 can connect to a Cisco 7960 IP Phone and carry IP voice
traffic. If necessary, the Catalyst 4224 can supply electrical power to the circuit
connecting it to the Cisco 7960 IP Phone.