求翻译：通信网安全、VPN技术、安全协议、数据备份与灾难恢复、安全数据库、防火墙技术、计算机病毒检测技术、入侵检测技术、通信原理、密码学基础、安全操作系统等是什么意思？

Communication network security, VPN technology, security protocols, data backup and disaster recovery, security, database, firewall technology, computer virus detection, intrusion detection technology, communication theory, cryptography-based security operating system

communication network security, VPN technology, security agreements, data backup and disaster recovery, security database, firewall technology, the computer virus detection technology, intrusion detection technology, communication theory, cryptography, security based operating system, etc.

The communications network security, the VPN technology, the security agreement, the data backup and the disaster restore, the security database, the firewall technology, the computer virus examination technology, the invasion examination technology, the correspondence principle, the cryptology foun

Communication network security, VPN technologies, security protocols, data backup and disaster recovery, security, database, firewall, intrusion detection technology computer virus detection technology, Foundation, communication theory, cryptography, security operating system

Communication network security, VPN technologies, security protocols, data backup and disaster recovery, security, database, firewall, intrusion detection technology computer virus detection technology, Foundation, communication theory, cryptography, security operating system