i don't know which book is good to gain knowledge and crack the exam of CISCO?
Hi Shilpa, though CISCO offers a range of certification exams, so the best book to prepare for a Cisco exam will depend on which specific certification you are targeting. Cisco certifications are divided into different tracks, such as CCNA, CCNP, and CCIE, each of which has its own set of exams and study materials. You can refer to these books- Official Cisco Study Guides, Cisco Press Books, Official Cert Guide etc. Also, if you want to attempt mock tests, please check out this link.