want to know about networking job in gulf...?

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Hi one of my frirends was asking me to go to gulf on networking job....I want to know what topics we should cover that are important to work as a network technetion ....what my friend want me to do is go to gulf and work as a technetion there on contract basis...where the contractor will send me to different companies for solving network problems of the company, software issues ....etc. i dont know any thing about networking ...please suggest me the topics to cover and also some good sites where i can find them which will be verry easy for me to undersatand.....