| A | B |
|---|
| Where you can configure the router from | console port, auxiliary port, interface |
| You must initially configure the router from | console port |
| The router's interfaces, can be connected to LANs and WANs hosts that act as | virtual terminals, TFTP servers, network management stations |
| Internal router configuration components | RAM/DRAM , NVRAM , Flash, ROM, interfaces |
| RAM/DRAM | stores routing tables, ARP cache, fast-switching cache, packet buffering, and packet hold queues |
| RAM content is | lost during a power down or restart |
| NVRAM | stores the router's backup/startup configuration file |
| NVRAM content is | retained during power down or restart |
| Flash | erasable, reprogrammable ROM that holds the operating system image and microcode |
| Flash memory enables | software updates without removing and replacing processor chips |
| Flash memory can | store multiple versions of IOS software |
| ROM | contains power-on diagnostics, a bootstrap program, and operating system software |
| software upgrades in ROM require | removing and replacing pluggable chips on the CPU |
| Interfaces | network connections on the motherboard or on separate interface modules, through which packets enter and exit a router |
| a router uses RAM to store | an active configuration file, and tables of network maps, and routing address lists |
| A saved version of the configuration file is stored | in NVRAM |
| The configuration file contains | global, process, and interface information that directly affects the operation of a router and its interface ports |
| An operating system image | cannot be displayed on a terminal screen |
| user EXEC mode | This is a look-only mode in which the user can view some information about the router, but cannot make changes |
| privileged EXEC mode | This mode supports the debugging and testing commands, detailed examination of the router, manipulation of configuration files, and access to configuration modes |
| setup mode | This mode presents an interactive prompted dialog at the console that helps the new user create a first-time basic configuration |
| global configuration mode | This mode implements powerful one-line commands that perform simple configuration tasks. |
| other configuration modes | These modes provide more detailed multiple-line configurations. |
| RXBOOT mode | This is the maintenance mode that you can use, among other things, to recover from lost passwords. |
| You can recognize an active configuration file by the words | current configuration at the top. |
| You can recognize a backup configuration file when you see | a message at the top that tells you how much non-volatile memory you have used |
| A modem is connected to a computer via a | auxiliary port |
| When a trace attempt returns an asterisk for a hop, that means | it was unsuccessful |
| The line status is triggered by a | carrier detect signal |
| If no entry exists for a target network in the routing table, the frame is sent to | the default router |
| The line protocol is triggered by | keepalive frames |
| Routing tables | are stored in RAM |
| With ping, a period ( .) means that | the echo request was unsuccessful. |
| With ping, a ! means that | the echo request was successful |
| The exit or logout command ends a | telnet session |
