What are the data units at different layers of the TCP / IP protocol suite
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What is Firewall? I saw in one website Firewall is software and hardware and combination of software and hardware.It is used to protect user information or avoiding crackers.how it is?Whether it is hardware?If not then why the images are like that?(a wall ).Please help me by answering this question.Advance thanks.
I am working in a Engg college at Orissa. I am having windows xp OS. We have a linux server in CSE dept. My question is that in client site I want access facebook and torrent sites. The above sites are blocked in Linux server. So How can I unblock these particular sites in client system. Is there any software available for that ? plz give me some idea about this ?
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Networking Protocols 
