| A | B |
|---|
| IP or Logical | Routers make forwarding decisions based on these addresses |
| RAM | Router memory component which loses its content when the router is turned off. |
| Interface | Network connection through which packets enter and exit a router. |
| ROM | Contains power-on diagnostics, bootstrap program, and operating system software. |
| Flash | Erasable, reprogrammable ROM which holds the operating sytem image (IOS). |
| Serial, lower speed | Type of connections WANs use that LANs typically don't use. |
| Physical and Data Link | Layers of OSI model WAN standards describe. |
| WANS | Provide full-time and part-time connectivity. |
| Exchanging data packets between routers and LANs they support | The service a WAN provides to a LAN. |
| Interface between DTE and DCE | What WAN physical layer standards describe. |
| Network Layer | OSI layer WAN routers operate at |
| DCE | Service provider like a modem |
| DTE | Attached device like a computer or router |
| HDLC | WAN protocol which supports point-to-point and multipoint configuration. |
| Frame Relay | Uses high quality digital facilities with no error correction and is more efficient than X.25 |
| X.25 | An older and slower WAN technology than Frame Relay |
| How frames are carried between systems | WAN data link protocols describe |
| Narrowband ISDN | Circuit-switched WAN technology |
| ATM & SMDS | Cell-switched WAN technologies |
| X.25 & Frame Relay | Packet-switched WAN technologies |
| NVRAM | Where router configuration files are stored. |
| IP | WAN protocol used for path determination decisions |
| User Mode | Router access mode which checks status of router only. |
| Privileged Mode | Router access mode which allows changing router configuration. |
| router> | User mode prompt |
| router# | Privileged mode prompt |
| Enable | Command entered to get into the privileged mode. |
| Exit | Command entered to log out of a router. |
| ? | Command used to display a handy list of commonly used commands. |
| Spacebar | When -More- appears, press this to view the next available screen |
| Up arrow or Ctrl-P | Used to recall the previous command entry. |
| ^ | Symbol which indicates the location of an error in the command. |
| Enter | Keystroke used to execute the command on a router. |
| Tab | After entering the unique characters for a command as a shortcut, press this and it will complete the command. |
| Ctrl-Z | Used to back out of a configuration mode. |
| Ctrl-A | Used to move to the beginning of a command line. |
| Ctrl-E | Used to move to the end of a command line. |
| Show history | Command to show the command buffer. |
| Terminal history | Command allows you to set the size of the command buffer. |
| 10 | Default number of lines in the command history. |
| 256 | Maximum number of lines in the command history. |
| No terminal editing | Command disables advanced editing features. |
