Routers and Routing Basics

1
Routers and Routing Basics

• WANs And Routers

2
Intro To WANs
3
WAN Services
4
WAN Services
5
Routers Internal Configuration Components
6
DRAM

• Stores routing tables
• Holds ARP cache
• Holds fast-switching cache
• Performs packet buffering (shared RAM)
• Maintains packet-hold queues
• Provides temporary memory for the configuration
  file of the router while the router is powered on
  
• Loses content when router is powered down or
  restarted

7
NVRAM

• Provides storage for the startup configuration
  file
• Retains content when router is powered down or
  restarted

8
Flash

• Holds the operating system image (IOS)
• Allows software to be updated without removing
  and replacing chips on the processor
• Retains content when router is powered down or
  restarted
• Can store multiple versions of IOS software
• Is a type of electronically erasable,
  programmable ROM (EEPROM)

9
ROM

• Maintains instructions for power-on self test
  (POST) diagnostics
• Stores bootstrap program and basic operating
  system software
• Requires replacing pluggable chips on the
  motherboard for software upgrades

10
Interfaces

• Connect router to network for frame entry and
  exit
• Can be on the motherboard or on a separate module
  

11
Routers LANs and WANs
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Routers Physical Characteristics
13
Routers Management Port Connections
14
Hyper Terminal Session Properties

• Configure terminal emulation software on the PC
  for
• The appropriate com port
• 9600 baud
• 8 data bits
• No parity
• 1 stop bit
• No flow control
• ?Lab 10.1 Connecting Console Interfaces

15
Routers Connecting LAN Interfaces

• ?Lab 10.2 Connecting Router LAN Interfaces

16
Routers Connecting WAN Interfaces
?Lab 10.3 Connecting WAN Interfaces
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Next Weeks Agenda

• Chapter 11 Router Fundamentals
• Please remember to
• ?Reset the equipment
• ?Disconnect the cables
• ?Clean around your PC
• ?Push your chair in
• See you next week?