Till the past century every organization was operating as individual entities but now with companies developing high tech techniques that are very efficient in utilizing low cost resources many companies have started to rely on the knowledge developed by other companies. For example the concept of ERP has made very easy and reliable for most manufacturing and retailing companies of the world. This concept has a lot of advantages to it and hence companies cannot ignore the concepts and technologies developed by them. In order to use these concepts companies need professional who could help them in implementing the technology according to their needs. The only way in which the companies can ascertain that a person is well qualified to do the job is through the certification that he holds in that concept issue by the company which had developed the concept.

The company that has established itself in the field of networking is Cisco. Cisco is the company that is synonym in the field of networking. It is the forerunner in the field of networking. The company has done a lot of research over the years and has created courses for people to learn the knowledge that they had gathered over he yeas. They have done it through certification programs. Cisco 642-436 is a very famous certification exam by Cisco, it is also known as Cisco voice over IP. The main objective of this test is to test the candidate’s knowledge of VOP concepts. The idea is to find whether he has the basic knowledge about VOIP. It also checks whether the person has the knowledge to implement gatekeepers, gateways and IP-IP gateways. The easiest way to clear this Cisco 642-436 examination is to attend the Cisco’s course for VOIP. There are various other resources too available for clearing this Cisco 642-436 exam.