This lab connects two routers together using directly attached cables to simulate a WAN link. This allows the routers to be configured and tested as though they were geographically separated. This simulated WAN link takes the place of the service providers network and can be thought of as a CSU/DSU eliminator. The first steps involve finding out what kind of connections are on the router and what kind of cables are needed | Cisco SrsTEMS Lab Connecting WAN Interfaces Router 1 Router 2 Straight-through cable Serial cable Console Rollover Crossover cable Objective Identify the serial interfaces on the router. Identify and locate the proper cables to interconnect the routers. Use the cables to connect the router. Background Preparation This lab connects two routers together using directly attached cables to simulate a WAN link. This allows the routers to be configured and tested as though they were geographically separated. This simulated WAN link takes the place of the service providers network and can be thought of as a CSU DSU eliminator. The first steps involve finding out what kind of connections are on the router and what kind of cables are needed. Step 1 Identify the serial interfaces on the router a. Examine the router. b. What is the model number of the router c. What is the model number of the second router 1 - 3 CCNA 2 Routers and Routing Basics v - Lab Copyright 2003 Cisco Systems Inc. d. How many serial ports are there on each router that could be used for connecting the routers Record the information below. Router Name Serial Port Serial Port Serial Port Router 1 Router 2 Step 2 Identify and locate the proper cables a. Inspect the serial cables available in the lab. Depending on what type of router and or serial card used the router may have different connectors. The two most common types are the DB-60 and the smart serial connectors. Using the table below indicate which type of interfaces the routers have. Router Smart Serial DB-60 b. Since this lab will not be connected to a live leased line one of the routers will need to provide the clocking for the circuit. This is normally provided to each of the routers by the service provider. To provide this clocking signal in the lab one of the routers will need a DCE cable instead of the DTE cable used on the other router. In this lab the connection between routers uses one DCE cable and one DTE cable. The DCE-DTE
