When you turn the router on, it runs through the following boot process.
1. The Power-On Self Test (POST) checks the router's hardware. When the POST completes successfully, the System OK LED indicator comes on.
2. The router checks the configuration register to identify where to load the IOS image from.
A setting of 0x2102 means that the router will use information in the startup-config file to locate the IOS image. If the startup-config file is missing or does not specify a location, it will check the following locations for the IOS image:
1. Flash (the default location)
2. TFTP server
3. ROM (used if no other source is found)
3. The router loads the configuration file into RAM (which configures the router).
The router can load a configuration file from:
1. NVRAM (startup-configuration file)
2. TFTP server
3. If a configuration file is not found, the router starts in setup mode.
Setup Mode Facts
If the router is brand new, it has no startup-config file. Therefore, when it boots, it immediately enters Setup mode. Setup mode is a special, guided routine that asks you a series of questions and uses your responses to make basic configuration entries.
There are two ways to enter setup mode:
=> Boot the router without the startup-config file. This happens when you erase the current startup-config file, or when you boot a new router.
=> Use the setup command from privileged mode.
You can exit setup mode without answering all the questions by pressing Ctrl + C. The information you've entered to that point will not be saved.
Cisco routers and switches come with the following defaults:
No set passwords. During setup mode, passwords are created.
All router interfaces are in shutdown mode until they are enabled.
All switch interfaces are enabled and ready to forward packets.
Note: Some Cisco switches allow you to enter an express setup mode. Be aware of the following express setup details:
The device must be enabled as a DHCP server.
The device must be power cycled while pressing the Mode button and while your PC is connected to an Ethernet interface.
Use a Web browser to enter the express setup mode by going to 10.10.10.1.
Different modes of operation
1. User Execution Mode
a. VTY
b. CONSOLE
c. AUXILIARY
By using enable command we can enter in the privilege mode.
2. Privileged mode
a. We can copy or save the configuration in this mode
b. All the command of show is executed in this mode.
3. global configuration mode
a.We can change the configuration in this mode.
1. The Power-On Self Test (POST) checks the router's hardware. When the POST completes successfully, the System OK LED indicator comes on.
2. The router checks the configuration register to identify where to load the IOS image from.
A setting of 0x2102 means that the router will use information in the startup-config file to locate the IOS image. If the startup-config file is missing or does not specify a location, it will check the following locations for the IOS image:
1. Flash (the default location)
2. TFTP server
3. ROM (used if no other source is found)
3. The router loads the configuration file into RAM (which configures the router).
The router can load a configuration file from:
1. NVRAM (startup-configuration file)
2. TFTP server
3. If a configuration file is not found, the router starts in setup mode.
Setup Mode Facts
If the router is brand new, it has no startup-config file. Therefore, when it boots, it immediately enters Setup mode. Setup mode is a special, guided routine that asks you a series of questions and uses your responses to make basic configuration entries.
There are two ways to enter setup mode:
=> Boot the router without the startup-config file. This happens when you erase the current startup-config file, or when you boot a new router.
=> Use the setup command from privileged mode.
You can exit setup mode without answering all the questions by pressing Ctrl + C. The information you've entered to that point will not be saved.
Cisco routers and switches come with the following defaults:
No set passwords. During setup mode, passwords are created.
All router interfaces are in shutdown mode until they are enabled.
All switch interfaces are enabled and ready to forward packets.
Note: Some Cisco switches allow you to enter an express setup mode. Be aware of the following express setup details:
The device must be enabled as a DHCP server.
The device must be power cycled while pressing the Mode button and while your PC is connected to an Ethernet interface.
Use a Web browser to enter the express setup mode by going to 10.10.10.1.
Different modes of operation
1. User Execution Mode
a. VTY
b. CONSOLE
c. AUXILIARY
By using enable command we can enter in the privilege mode.
2. Privileged mode
a. We can copy or save the configuration in this mode
b. All the command of show is executed in this mode.
3. global configuration mode
a.We can change the configuration in this mode.
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