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By Karl Solie

Cisco qualified Internetwork specialist (CCIE) certification is the main tricky and so much worthwhile of the Cisco(r) certifications. even though the pro and monetary merits of a CCIE are very good, achieving this point of certification takes years of expertise, learn, and energy. Serving a twin function of networking reference advisor for configuring Cisco routers and coaching instrument for the CCIE Lab assessments, CCIE functional stories, quantity I, is a perfect source that will help you in achieving and earn the coveted CCIE designation.

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Gaining Privileged Access: The 16-Bit Boot Register I think that one of the best-kept secrets of Cisco routers and switches is the 16-bit boot register. The 16-bit register is located on almost every Cisco platform in one variation or another. For example, this is the same register that was set by jumpers on the AGS series routers in the early 1990s. It is the same register that is found in the Catalyst switches in 2001. And, for the most part, it is the same register on all Cisco routers, sometimes masked in a utility called CONFREG.

Y/n [n]:14Offdisable "load rom after netboot fails"? y/n [n]:13Onenable "use all zero broadcast"? y/n [n]:10Offenable "break/abort has effect"? y/n [n]:8Offenable "ignore system config info"? y/n [n]:6Offchange console baud rate? y/n [n]:11&12Off and Offchange the boot characteristics? y/n [n]:0-30x2 Password Recovery: Routers When you have a solid understanding of how the boot register works, password recovery becomes straightforward. For all the router platforms, the procedure involves simply changing bit 6, which ignores the startup-config in NVRAM, and then reloading the router.

Table 1-10. CONFREG to BIT Comparison CONFREG TextBit(s) SetDefault Settingenable "diagnostic mode"? y/n [n]:15Offenable "use net in IP bcast address"? y/n [n]:14Offdisable "load rom after netboot fails"? y/n [n]:13Onenable "use all zero broadcast"? y/n [n]:10Offenable "break/abort has effect"? y/n [n]:8Offenable "ignore system config info"? y/n [n]:6Offchange console baud rate? y/n [n]:11&12Off and Offchange the boot characteristics? y/n [n]:0-30x2 Password Recovery: Routers When you have a solid understanding of how the boot register works, password recovery becomes straightforward.

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