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Routers and Routing Basics. WANs And Routers. Intro To WANs. WAN Services. WAN Services. Routers: Internal Configuration Components. DRAM. Stores routing tables Holds ARP cache Holds fast-switching cache Performs packet buffering (shared RAM) Maintains packet-hold queues

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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


Nvram
NVRAM

  • Provides storage for the startup configuration file

  • Retains content when router is powered down or restarted


Flash
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)


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


Interfaces
Interfaces

  • Connect router to network for frame entry and exit

  • Can be on the motherboard or on a separate module





Hyper terminal session properties
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


Routers connecting lan interfaces
Routers: Connecting LAN Interfaces

Lab 10.2: Connecting Router LAN Interfaces


Routers connecting wan interfaces
Routers: Connecting WAN Interfaces

Lab 10.3: Connecting WAN Interfaces


Next week s agenda
Next Week’s 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


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