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WAN Interface Card (WIC2AM): This interface has two RJ-11 jacks and two V.90 analog internal modems.

The PBX function is presented in Chapter 10, “Internet Technologies: Out to the Internet.” This router can be programmed as a small Private Branch Exchange (PBX) for use in a small office.

Voice Interface Card (VIC2-4FXO): This interface shows four phone line connections.

( Note: The CSU/DSU function is presented in Chapter 8, “Introduction to Switch Configuration.”) This type of connection (RJ-45) replaces the older cabling using V.35 cable (shown later in Figure 5-18). This interface is used to provide a T1 connection to the communications carrier.

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This is a serial connection, and it has a built-in CSU/DSU. Serial Interface: CTRLR T1 1 and CTRLR T1 0. The auxiliary port provides an alternative way to remotely log in to the router if the network is down. Auxiliary Input: This input is used to connect a dial-in modem into the router.The console cable can also have an RJ-45 connector on one end and an integrated DB9 connector on the other end. The console cable can have RJ-45 plugs on each end and requires the use of an RJ-45 to DB9 adapter for connecting to the computer’s COM1 or COM2 serial port. A special cable, called a console cable, is used to connect the console input to the serial port on a computer. Console Input: This input provides an RS-232 serial communications link into the router for initial router configuration.FastEthernet Ports: FE0/0: Fast Ethernet (10/100Mbps) and FE0/1: Fast Ethernet (10/100Mbps).USB Interface: The USB ports are used for storage and security support.The following describes the function of each interface:

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Often the router ports are called the router interface, the physical connection where the router connects to the network.įIGURE 5-15 The rear panel view of a Cisco 2800 series router. The router ports are bidirectional, meaning that data can enter and exit the same router port. The arrows pointing in and out indicate that data enters and exits the routers through multiple ports. The common symbol used to represent a router in a networking drawing is provided in Figure 5-14. Routers have multiple port connections for connecting to the LANs, and by definition a router must have a minimum of three ports. Routers also make it possible to interconnect to LANs around the country and the world and interconnect to many different networking protocols. Routers can be used to interconnect networks that use the same protocol (for example, Ethernet), or they can be used to interconnect LANs that are using different layer 2 technologies such as an Ethernet and token ring. Routers are used to interconnect LANs in a campus network.

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This differs from the bridge and the layer 2 switch, which use the Ethernet address for making decisions regarding forwarding data packets and only know how to forward data to hosts physically connected to their ports.

Describes the IP address location of the network and the address location of the host in the networkĮssentially, the router is configured to know how to route data packets entering or exiting the LAN.