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paperback. Condición: New. Language:Chinese.Paperback Pages Number: 240 computer security. including operating system security. database security and network security - Part 3. Network security is the issue of current concern. Book from the basics of computer security. computer entities and hardware security. computer software security. operating system security. password security. database security. computer virus technology. the fundamentals of network security. firewall technology. hacker attacks and prevention tech.