I am writing this after passing my CCIE Routing & Switching Lab and CCIE Service Provider Lab, just over 2 years ago. I think my experience will help students those are preparing for CCIE lab. I would request you to read all sections till the end. Have you ever thought, why people are so crazy

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Port address translation is another variation of NAT and the most popular one and this is the one maximum people are using in the industry. It is also called NAT Overloading because it is designed to map many IP addresses to just a single registered IP address (overloaded address) by applying different port addresses in

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Access Control List (ACL) is used for filtering traffic based on a given filtering criteria on a router or switch interface. Based on the conditions supplied by the ACL, a packet is allowed or blocked from further movement. ACLs for TCP/IP traffic filtering are mainly divided into two types: Standard Access Lists Extended Access Lists

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