ccna certification value

ccna certification value.7.1.6 Switch Boot SequenceAfter the Cisco switch is powered up, the boot sequence is as follows.1 Perform low-level CPU initialization: Start the loader to initialize the CPU registers, which control the mapped location of physical memory, the amount of memory, and the memory speed.Perform a power-up self-test (POST) of the CPU subsystem: The boot loader tests the CPU, memory, and FlashoInitializes the Flash file system on the system motherboard.Load IOS Image File: The switch loads the IOS image file into memory and boots the switch. First the switchAttempt to automatically boot using the information in the BOOT environment variable. If this variable is not set, the boot loader first looks for the image file on the switch in a directory with the same name as the CiscoIOS image file in Flash, and if it is not found in that directory, the boot loader software searches each subdirectory and then continues searching the original directory. If the IOS file is not found, the switch: mode is entered. For example, if you delete the IOS file by mistake or other reasons, you need to restore the IOS by XMODEM method at this time.5 Load the configuration file. The switch looks for the configuration file config.text in Flash and loads it. If the configuration file is not found, it prompts whether to enter setup mode.The left side of the Cisco switch front panel has Mode buttons and several status LEDs. Switches of different models and feature sets will have different LEDs and may have different locations on the front panel of the switch. The Mode button is used to toggle between port status, port duplex, port speed, and port PoE status. The common indicators are listed below.System (SYST) LED: Indicates if the system is powered on and working properly. 2