4.2. Describe the operation of Cisco routers (including router bootup process, POST, router components)

To configure and troubleshoot a Cisco internetwork, you need to know the major components of Cisco routers and understand what each one does. Table 4.1 describes the major Cisco router components.

Table 4.1. Cisco Router Components
BootstrapStored in the microcode of the ROM, the bootstrap is used to bring a router up during initialization. It will boot the router and then load the IOS.
POST (power-on self-test)Stored in the microcode of the ROM, the POST is used to check the basic functionality of the router hardware and determines which interfaces are present.
ROM monitorStored in the microcode of the ROM, the ROM monitor ...

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