This entry will face a few points that you will be hardened for the CCNA about the configuration of obnoxious Cisco IOS router maneuver. IOS (Internet work running System) is the software running logic managing on most Cisco logic, counting switches and routers. To configure any Cisco logic appliance you requisite to master the Cisco IOS Configuration tips and use the dictate Line boundary (CLI) to configure and troubleshoot a Cisco appliance.
How to connect to a Router in order to configure it:
You can connect to a Cisco IOS Router whichever exactly or randomly. For the first time when the appliance is not configured yet, you mostly connect exactly using a console cable via the CON haven or randomly by dialing into a modem coupled to the AUX haven. These are called "out-of-band" connection methods. After you configure the router and assign IP addresses to its interfaces, you can connect to the router from the logic using an "in-band" connection logic with Telnet or SSH.
Router Configuration Modes
After connecting to a Cisco Router (let's say with a console), you are unfilled using the dictate Line border in which you nature and include configuration tips. After typing a dictate, you lobby include and the dictate is automatically active on the design. For example with the "shutdown" dictate on a border, automatically disables the border. Now, there are two Router Configuration Modes (or access modes):
User EXEC Mode: Allows the administrator to access solely imperfect monitoring tips. You cannot actually make any configurations from this form. The dictate provoke on this form is "router>"
Privileged EXEC Mode: Allows the administrator to access all design tips, such as those tattered for configuration and management, and can be password cosseted to allocate solely authorized users to access the design at this "full-access" rendition. This form is also called allow form because you get to it using the allow dictate. The dictate provoke on this form is "router#". From the privileged EXEC form you can begin configuring the design by typing "configure terminal".
Router depart Types
A Cisco router has four depart types:
ROM: This is wherein the marker libretto of the router is located. The marker software (Power On nature Test) is tattered during startup to playhouse the early hardware glance of the design. The ROM also holds a mini-IOS tattered for password recovery.
RAM: This is wherein the managing configuration is located. After the originate boots up, the IOS software is wealthy into RAM. Also, RAM holds routing tables, interact parameters during function etc. When configuring the router, we actually mutation the running-configuration which as we said is stored into RAM
NVRAM: When we economize the running-configuration (using the pronounce "write") it is stored into the NVRAM and becomes the startup-configuration. After rebooting the router, the startup-configuration is wealthy from the NVRAM.
Flash: This is like the hard disk of a PC. It holds the IOS software idea keep and any help configurations that you might economize from time to time.
When you challenge the "show running-configuration" pronounce on the router you instruct the originate to parade the open managing configuration in RAM. When you challenge the "show startup-configuration" pronounce you instruct the router to parade the stored configuration in the NVRAM.
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