The first two TechExams.Net CCNA TechLabs
require a lab setup as described in this document. Each component
will be described and shown in picture (click the picture
for a larger version). The following network diagram is a
logical representation of what we are going to build:
The routers used in our CCNA TechLabs are 2501 routers, displayed
in the picture above. The upper router in the picture shows
the back, where you'll find the connectors and, also important,
the power switch. The 2501 router is equipped with the following
- AUI - This is a traditional Ethernet LAN
- Serial 0 and Serial 1 - These are synchronous
serial WAN ports.
- Console - This is the management console
- AUX - A modem can be connected to this
port to allow 'out-of-band' management.
The picture on the left shows a V.35 DTE cable with a male
DB60 connector and a male standard 34-pin Winchester-type
connector. The right picture shows a V.35 DCE serial cable
with a male DB60 connector and a female 34-pin Winchester-type
connector. As you probably guessed already, the male connector
of the DTE cable is attached to the DCE cable's female connector,
this is depicted in the picture below. This is known as a
back-to-back connection, and 'simulates' a WAN link. In a
real world setup, the DTE cable's male connector typically
connects to a port on a CSU/DSU provided by a service provider
(i.e. telco), which in turn connects to a CSU/DSU at another
location, thru a T1 link for example. The DB60 connector connects
to a Serial interface on a router.
Ethernet LAN connections
These two small devices are Ethernet Transceivers and are
used as an adapter between the AUI interface on the router
and a twisted pair cable that leads to the NIC on your PC,
a port on a switch, hub, or other router. This is essentially
This is a UTP roll-over cable with an RJ-45 connector that
connects to the Console port of the router. The other end
of the cable typically connects to a small adapter with a
DB-9 female connector that allows you to connect it to a COM
port on a PC. A router that is installed and configured with
IP addressing is typically managed using TELNET. The initial
configuration is performed thru the management console. Besides
the initial setup, the console connection must also be used
if you need to perform password recovery on a router.
The End Result
When everything is connected properly, and the power is turned
on, it should look like the picture above. Click
here for a huge version of this picture.
Configure the router
To configure the router we are going to use HyperTerminal
(included in Windows), but most terminal emulators will do.
Make sure the console cable is attached to a COM port on your
PC and the other end to the Console port of one of the routers.
- Start up HyperTerminal (Start, Programs, Accessories, Communication)
- When the New Connection dialog box opens, enter a description
for the connection (i.e. Cisco 2501), select an Icon and click
- Select the COM port to which the console cable is connected
and click OK.
- Set the properties of the COM port to: Bits per second 9600,
Data bits 8, Parity None, Stop Bits 1, and Flow control None.
- Save the connection and place the shortcut on a meaningful
location, i.e. your desktop.
If you turn on the power of the router after
you start HyperTerminal and connect, you will see a similar
output as shown below:
System Bootstrap, Version 11.0(10c), SOFTWARE
Copyright (c) 1986-1996 by cisco Systems
2500 processor with 8192 Kbytes of main memory
Read the Basic
Cisco Router Configuration and Management TechNotes for
more information about the router start-up sequence.
If the router is turned on already, and you connect to it,
the following output will be shown by default:
Router con0 is now available
Press RETURN to get started.
(Router is the hostname of the router, which
can be different.)
If there isn't a startup configuration available the intial
Setup dialog will be started, which is like a text-based wizard.
In general, you should skip it, and configure the router manually.
If this is 'your first time', or you simply want to check
everything, run the following commands at the command prompt
and check out the output:
Router> show version
Router> show interfaces
Router> show flash
This shows the flash memory and the IOS file.
Or start right-away with our first TechLab: Configuring
a RIP network