Cisco SPA3102 User's Guide download pdf (Page 13)

Voice Gateway with Router

Chapter 2: Networking Basics

An Introduction to Local Area Networks

Chapter 2: Networking Basics

An Introduction to Local Area Networks

Simply put, a router is a network device that connects two networks together.

The Voice Gateway connects your local area network (LAN), or the group of PCs in your home or office, to the

Internet. The Voice Gateway processes and regulates the data that travels between these two networks.

The Voice Gateway’s Network Address Translation (NAT) technology protects your network of PCs so users on the

Internet cannot “see” your PCs. This is how your LAN remains private. The Voice Gateway protects your network

by inspecting the first packet coming in through the Internet port before delivery to the final destination on one of

the Ethernet ports. The Voice Gateway inspects Internet port services like the web server, ftp server, or other

Internet applications, and, if allowed, it will forward the packet to the appropriate PC on the LAN side.

The Use of IP Addresses

IP stands for Internet Protocol. Every device in an IP-based network, including PCs, print servers, and routers,

requires an IP address to identify its location, or address, on the network. This applies to both the Internet and

LAN connections.

There are two ways of assigning IP addresses to your network devices.

A static IP address is a fixed IP address that you assign manually to a PC or other device on the network. Since a

static IP address remains valid until you disable it, static IP addressing ensures that the device assigned it will

always have that same IP address until you change it. Static IP addresses are commonly used with network

devices such as server PCs or print servers.

static ip address: a fixed address

assigned to a computer or device that is

connected to a network.

nat (network address translation): NAT

technology translates IP addresses of a

local area network to a different IP

address for the Internet.

ip (internet protocol): a protocol used to

send data over a network.

ip address: the address used to identify a

computer or device on a network.

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Cisco SPA3102 User's Guide Page 13