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Chapter 5

WANs and Routers/ Introduction to Routers

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Objectives

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Introduction to WANs

• A WAN is a data communications network that spans a large geographic area such as a state, province, or country.

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WAN Devices

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WAN Services

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Data Link Encapsulations

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Internal Configuration Components

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Routers Connected by WAN Technologies

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Path Determination

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Internetwork Routers

• Any internetwork must include the following:

Consistent end-to-end addressing

Addresses that represent network topologies

Best path selection

Dynamic or static routing

Switching

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Academy Approach to Labs

• In the academy lab, all the networks will be connected with serial or Ethernet cables and the students can see and physically touch all the equipment.

• Devices that make up the WAN cloud are simulated by the connection between the back-to-back DTE-DCE cables.

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Router Internal Components

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Router Internal Components

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Internal Components of a 2600 Router

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External Connections on a 2600 Router

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Router External Connections

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Computer or Terminal Console Connection

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Modem Connection to Console or Auxiliary Port

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Console Port Connections

1. Configure terminal emulation software on the PC for the following:

The appropriate com port

9600 baud

8 data bits

No parity

1 stop bit

No flow control

2. Connect a rollover cable to the router console port (RJ-45 connector).

3. Connect the other end of the rollover cable to the RJ-45 to DB-9 adapter

4. Attach the female DB-9 adapter to a PC.

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Eight-Pin Connections for Cisco 2600 Series Routers

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WAN Types

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Router Serial WAN Connectors

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DCE Serial Connections

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Summary

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Introduction to Routers

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Objectives

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The Purpose of Cisco IOS Software

• Basic routing and switching functions

• Reliable and secure access to networked resources

• Network scalability

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Router User Interface

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Router User Interface Modes

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Cisco IOS Naming Conventions

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Operating Cisco IOS Software

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Steps in Router Initialization

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Setup Mode

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Router LED Indicators

Cisco routers use LED indicators to provide status information. LED indicators will vary for different Cisco router models.

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The Initial Router Bootup

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Examining the Initial Bootup Output

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Examining the Initial Bootup Output continued

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Establish a Console Session

• All Cisco routers include an EIA/TIA-232 asynchronous serial console port. The console port is an RJ-45.

• Use an RJ-45 to RJ45 rollover cable with a female RJ-45 to DB-9 adapter to connect a PC to the console port

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Router Modes

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User Mode Commands

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Privileged Mode Commands

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clock set Command

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Using IOS Command history

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The User Interface Error Indicator

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The show version Command

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Summary

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Question/Answer