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TABLE OF CONTENTS INTRODUCTION 1 WHAT IS NETWORK? 2 CLASSIFICATION OF NETWORKS 3 TYPES OF NETWORKS USED IN BUSINESS ORGANIZATIONS 3 Peer-to-Peer Networks 3 Client/Server Networks 3 Thin-Client Computing 4 NEED OF SECURITY OVER BUSINESS NETWORKS 4 BUSINESS NETWORK THREATS AND THEIR EFFECTS 4 Disruptions 4 Unauthorised Access 5 Trojan Horse Programs 5 Denial-of-Service (DoS) 6 Email spoofing 6 Packet sniffing 6 Measures Against unauthorised access 7 Formulating a Network Security Policy 7 Components of a Network Security Policy 7 Developing User Profiles 9 Using biometrics 9 Updating the operating system 10 Taking care of the network access points 10 Security Measures when connected to the Internet 10 Firewall 11 Physical security of the network 12 Secure Network Devices 15 Secure Call-Back Modems 15 Crypto-Capable Routers 15 Virtual Private Networks 15 CONCLUSIONS 16 REFERENCES 17 Network Security Introduction Since the last two decades there has been an overwhelming increase in the number of organizations that rely on data communication networks for their daily business communications, resource sharing, database information retrieval so on and so forth. Previously most computers were centralized and managed in data centres. Computers were kept in locked rooms and links outside a site were unusual. Computer security threats were rare, and were basically concerned with insiders. These threats were well understood...

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