How many exams do I have to pass to get CCNP Security certification, and what are the pre-requisites to appear for the exams? Is it mandatory to pass CCNA R&S and CCNA Security Certification exams first to get CCNP Security Certification? If yes, what is the exam cost of CCNA Security and CCNA R&S Exams?

How to use EIGRP protocol in a simple network? How to configure EIGRP? I want to know the basic commands and step by step guide to configure EIGRP on Cisco Routers?