The password does not appear on the screen and is case sensitive. If your system administrator has set a password, you are prompted to enter it before being granted access to privileged EXEC mode.

The privileged command set includes those commands contained in user EXEC mode, as well as the configure privileged EXEC command through which you access the remaining command modes. To view a comprehensive list of commands, enter a question mark (?) at the prompt.īecause many of the privileged commands configure operating parameters, privileged access should be password-protected to prevent unauthorized use. The supported commands can vary depending on the version of Cisco IOS software in use. In general, use the EXEC commands to temporarily change terminal settings, perform basic tests, and list system information. The EXEC commands available at the user level are a subset of those available at the privileged level. The Aux port is a console port that allows modem commands so you can dial into the router out-of-band if a remote router goes down and you need to configure it through the console connection.Īfter you access the device, you are automatically in user EXEC command mode. The Console port is a serial connection that allows out-of-band signaling. Miscellaneous ports can include Basic Rate Interface (BRI) for Integrated Services Digital Network (ISDN). The serial ports can be used for a WAN connectivity. The most prevalent LAN technology in use today is Switched Ethernet of varying speeds. Router interfaces can be 10 GigabitEthernet, 1 GigabitEthernet, FastEthernet, Ethernet, Token Ring and various other LAN physical technologies, like FDDI. Different router hardware platforms may vary slightly.

Note: As mentioned on the slide, this is a typical power-on / bootup sequence. The IOS then proceeds to load and then look for a valid configuration-the startup-config-that’s stored by default in nonvolatile RAM, or NVRAM. In case you don’t know, flash memory is an electronically erasable programmable Read-Only Memory (ROM)-an EEPROM. When you first bring up a Cisco router, it will run a Power-On Self-Test (POST), and if that passes, it will then look for and load the Cisco IOS from Flash memory-if a file is present. We will review switch interfaces at the end of the chapter.Ĭisco CCNA Router Power-On/Bootup Sequenceĭepicts the steps a routers goes through on boot. In this chapter we will discuss the basics and glaze over a few advanced topics with regard to interfaces, configurations, registries and the like. Cisco CCNA The Cisco Router and Switch Interface

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