bitmindframes

Introducing the Topology:

The show controllers command reveals whether the cable is DCE or DTE.

#show controllers serial 0/0/0

Interface serial0/0/0
Hardware is powerQUICC MPC860
DCE v.35, no clock

Interfaces:
By default all Serial and Ethernet interfaces are down.
The routing table will be empty.

Debugging:

Allows us to watch changes a router performs in real time.
For example, to observe routes being added and removed.

#debug ip routing
#undebug all (disables all debug commands). or
#no debug all. or
#un a. (short form)

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Tags: 802.1q, study, vlan, switch, vtp, wan

Planning & Cabling Networks

Media Required to Make a LAN Connection:

LANs use gateways to connect o other networks.
They use hubs or switches to connect end devices.
Each port on a router connects to a different network.
Routers break up broadcast domains and collision domains.
Routers can have both LAN and WAN interfaces.

Intranetwork Devices:

Hub

Receives signals, regenerates and sends them over all ports.
Creates a logical bus (i.e. multi-access media, everybody is on the same wire). [topologies].
Shared bandwidth approach – reduced performance (only one device can talk at a time).
A single collision domain.
Less expensive than switches.

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Tags: switch, ip, 802.1q, vtp, vlan, study

Bitmndframes cisco study guides

DTP Dynamic Trunking Protocol

Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Cisco proprietary Point-to-Point Protocol.
These various modes are configured using the switchport mode interface command
Switch trunk interfaces support different trunking modes.

• Access
• Dynamic desirable (default mode on Catalyst 2950 and 3550)
• Dynamic auto
• Trunk
• Non-negotiate
• dotq-tunnel (Not an option on the Catalyst 2950.)

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Tags: wan, cisco, switch, vtp, 802.1q, ip

Bitmindframes cisco study guides.

This will show you the basics of the cisco IOS command line interface and the different modes.

After several lines of information on the screen you should eventually see:
Would you like to enter the initial configuration dialog? [yes/no]: n

On some routers and switchesyou may see the following message.
Would you like to terminate autoinstall? [yes/no]: y Router> or Switch>

Privilege Mode
Router> enable
If you are prompted for a password type: class or if that does not work, type cisco

Use the “?” to view the list of available commands or command options
Router> ?

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