Cisco router Startup Process and TFTP injection into IOS

Cisco router startup process:
(1) execute Bootstrap Loader in the ROM, which is similar to the BIOS in the computer and Bootstrap will install IOS into RAM;
(2) IOS can be stored in many places (FLASH, TFTP server or ROM). The order in which the router looks for IOS images depends on the startup domain of the configuration register and other settings. Configuration
Register) is a 16-bit (2-digit) register value, 4-bit lower is the startup domain, different values represent never
Search for IOS in the same location.
Www.2cto.com
(3) Load IOS to RAM: If IOS is compressed, extract it first.
(4) Search for the configuration file in NVRAM and load the configuration file to RAM for running.
(5) If the configuration file is not found in NVRAM, enter the setup configuration mode (also known as the configuration dialog mode)

Www.2cto.com
Set TFTP to IOS:
IP_ADDRESS = 192.168.0.1
IP_SUBNET_MASK = 255.255.255.0
TFTP_SERVER = 192.168.0.100
TFTP_FILE = xxxxxxxx. bin
Tftpdnld