A LAN makes data connections across a broad geographic area, and a WAN makes a local connection in a building.
Companies can use WAN to connect remote locations, and a LAN can make a local connection in a building.
WANS are usually faster than LAN's.
Only WANS require a CSU/DSU to be used on the ends of a cable.
Routers enable different IP networks or IP subnets to communicate with each other.
Routers choose paths between networks using MAC address information.
Path selection is one of the main functions of a router.
Protocols are specialized chips on a router's motherboard to store routing tables.
Routers have a central processing unit and memory.
RAM stores the necessary Cisco IOS software for the router to begin booting.
RAM is not necessary if extra NVRAM is available.
RAM stores the current configuration information.
RAM is maintained when the router is turned off.
RAM stores routing tables for the router.
Serial port with DTE cable.
Serial port with DCE cable
Storing routing information
Accessing the router to change configurations
Telnet access to the router
Backup to the smart serial connections
Holds the Cisco IOS software image
Replaces the need for RAM chips
Keeps its contents when a router is rebooted
Can store multiple versions of Cisco IOS software
Backs up configuration sites
DTE is an acronym for digital transfer enhancement
DTE provides clocking information to the provider
DTE usually resides on the customer premise
DTE is an acronym for data terminal equipment
DTE is always connected to the first serial interface on a router
DCE is an acronym for digital clocking equipment
DCE provides clocking to the DTE
DCE is an acronym for data circuit-terminating equipment
DCE can be connected to the aux port on a router
It is a graphical user interface allowing easy point and click configuration
It is an access point for Rom Monitor Configurations
It is a text based interface using a keyboard
It is required for remote managment of routers
User Exec mode allows configuration changes to the router
Privileged Exec mode permits commands that can change the router's operation
Central Office# is an example of a privileged mode prompt
Central Office(config)# is an example of a privileged mode prompt
Central_office> is an example of a user mode prompt.
The user is in the wrong mode for the configure command
The prompt indicates that the user cannot configure the router
The ^ indicates that the letter r is not valid.
The word config should be entered as configure
It can be accessed using the setup command
It is loaded by default instead of a saved configuration in NVRAM
It loads by default when a router is new and booted for the first time
After setup mode is entered, the configuration is applied unless the router is rebooted.
Boot ROM (RX Boot)
An External TFTP Server
Terminal connection through the console port using a rollover cable
Telnet via a console cable
Terminal via a crossover cable
Telnet via an ethernet connection
Modem connection via an aux port
Gives you more detail information about the router
Allows you to enter global configuration mode
Allows you to enter a message to users who login to the router.
Allows you to view who is trying to hack into the router.