IOS boot sequence

The IOS boot sequence is a process performed after an Cisco IOS device is powered on. The IOS device performs a power-on self-test (POST) to test its hardware components and choose an IOS image to load. The boot sequence consistsĀ of the following steps:

1. The device performs the power-on self-test (POST) process to discover and verify its hardware components.

2. If the POST test is successful, the bootstrap program is copied from ROM into RAM.

3. The bootstrap program decides which IOS image to load from the flash memory into RAM, and then loads the chosen IOS.

4. IOS finds the startup configuration file, usually located in NVRAM, and loads it into RAM as the running configuration.

Prerequisites for 200-301

200-301 is a single exam, consisting of about 120 questions. It covers a wide range of topics, such as routing and switching, security, wireless networking, and even some programming concepts. As with other Cisco certifications, you can take it at any of the Pearson VUE certification centers.

The recommended training program that can be taken at a Cisco academy is called Implementing and Administering Cisco Solutions (CCNA). The successful completion of a training course will get you a training badge.

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