Refer To The Exhibit. Which Of The Three Cisco Ios Images Shown Will Load Into Ram?

Refer to the exhibit. Which of the three Cisco IOS images shown will load into RAM?

1. 1. The image is selected based on the boot system command in the configuration.
   2. The image is chosen based on the standards of the register configuration.
   3. The third Cisco IOS image was chosen on the account of the current IOS command.
   4. The second Cisco IOS image is chosen by the router due to its small size.

Answer: The correct answer is option 1. During the upgrade or testing of various IOS versions, the boot system is responsible for selecting the image to boot the Cisco device.

Boot system command 

For the up-gradation of the copied IOS image when the image is already present in the router flash memory. You must configure the router to update the new image in the boot process using this command. After then saving the changes, refresh the router to boot it with the changing image. After the booting, for the verification of the new image whether it is loaded or not use the show version command.

In the startup process, the bootstrap investigates the file of startup configuration in the NVRAM for boot system command which defines the name and the position of the Cisco IOS software image to deliver or load. Various boot system commands enter the sequence for a fault-tolerant boot plan.

The command is considered as the global command which is used to load the Cisco IOS image. Various types of syntax are available such as:

For flash specification as the main source of the Cisco ISO image.

Router(config)# boot system flash0://c1900-universalk9-mz.SPA.152-4.M3.bin

For the image source, the TFTP is specified with ROMmon as the backup and the syntax of the command is:

Router(config)# boot system tftp://c1900-universalk9-mz.SPA.152-4.M3.bin

Router(config)# boot system rom

By default, the router loads the first Cisco IOS image present in flash and runs it. for the verification, the show version command is considered.

Boot system command on switch and router

The interface available in the startup-config file is initiated with the Cisco IOS command by the OS of IOS. The file is known as config-text and is present in the flash.

Let’s take an example in which the boot system command is used to set the variable. the IOS is present in a different folder and the path is also defined. the show boot is used to check the set IOS boot file.

Automatically boot is tried by the switch along with using the data in the BOOT environment volatile. If the variable is not set, the switch tried to stack and run the first executable file it can find. On Catalyst 2960 Series switches image with the identical name as the file is present in the directory  (except the .bin file extension)

S1(config)# boot system flash:/c2960-lanbasek9-mz.150-2.SE/c2960-lanbasek9-mz.150-2.SE.bin.