Chapter 5
WANs and Routers/
Introduction to Routers
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1
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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3
WAN Devices
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4
WAN Services
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5
Data Link Encapsulations
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6
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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11
Router Internal Components
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12
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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20
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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27
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 RJ45.
• 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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38
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
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