This article will cover some points that you’ll be analyzed for the CCNA concerning the configuration of basic cisco ios download router operation. IOS (Internetwork Operating System) is the software operating system operating on most Cisco network gadgets, including switches as well as routers. To configure any specific Cisco network device you have to master the download cisco ios Configuration Commands and use the Command Line Interface (CLI) to configure and diagnose a Cisco device.

Methods to connect to a Router in order to Configure it:

You can connect with a cisco ios image download Router both directly or remotely. For the very first time when the device is not configured yet, you usually connect straight with a console wire via the CON port or remotely by dialing into a modem attached to the AUX port. These are referred to as “out-of-band” connection techniques. After you configure the router and assign IP addresses to its interfaces, you can connect with the router from the network with an “in-band” connection technique utilizing Telnet or SSH.

Router Configuration Settings

After connecting to a Cisco Router (let’s say utilizing a console), you’re offered the Command Line Interface wherein you type and enter configuration commands. After writing a command, you press enter and the command is immediately active on the device. Like utilizing the “shutdown” command on an interface, instantly puts off the interface. Now, you will find two Router Configuration Settings (or access settings):

* User EXEC Mode: Enables the administrator to access only limited monitoring commands. You can not basically make any configurations from this mode. The command prompt on this mode is “router>”

* Privileged EXEC Mode: Enables the administrator to use all device commands, like those used for configuration as well as management, and can be password protected to allow only qualified customers to use the device at this “full-access” level. This mode is also known as enable mode as you reach it with the enable command. The command prompt on this mode is “router#”. From the privileged EXEC mode you can start configuring the device by typing “configure terminal”.

Router Memory Types

A Cisco router has 4 memory types:

* ROM: This is where the POST script of the router is placed. The POST software (Power On Self Test) is used at the time of startup to carry out the initial hardware checking of the device. The ROM also holds a mini-IOS used for password recovery.

* RAM: This is where the functioning configuration is found. After the device boots up, the IOS software is loaded into RAM. Additionally, RAM holds routing tables, network parameters at the time of operation etc. While configuring the router, we basically change the running-configuration which as we said is saved into RAM

* NVRAM: When we store the running-configuration (using the command “write”) it is saved into the NVRAM and becomes the startup configuration. Soon after rebooting the router, the startup configuration is loaded from the NVRAM.

* Flash: This is exactly like the hard-disk of a PC. It holds the IOS software image file as well as any back-up configurations which you might save every once in awhile.

When you issue the “show running-configuration” command on the router you direct the device to display the existing running configuration in RAM. When you issue the “show startup-configuration” command you direct the router to display the saved configuration in the NVRAM.

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