以下为句子列表：
英文: Abstract: This paper introduced virtual private network technology(VPN)，including its background，idea，superiority，principle，security system and administration of networks.
中文: 文摘:简要介绍了虚拟专用网技术（VPN），包括它的背景、概念、优势、工作原理、安全机制和网络管理。
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英文: According to the current requirement of communication system, Alcatel Shanghai Bell (ASB) is able to provide a whole set of solutions and products in railway traffic region and highway private network region.
中文: 根据目前通信系统的需求，上海贝尔阿尔卡特在轨道交通领域和高速公路专网领域能够提供整套方案和产品。
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英文: Forwarder is publicly available, while others (backends and LDAP) are in private network with LAN IP's (10.10.10.0/24).
中文: 转发器可以被公共访问，后端和LDAP在私有网段（10.10.10.0/24）。
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英文: HighLink believes it's a small world when there're friends around, we'd like to be the bridge between you and your customers by providing voice&data services, Internet access, enterprise virtual private network (VPN), e-commerce, enterprise telecommunicat
中文: 海邻电讯以“海内存知己，天涯若比邻”为服务理念，为客户提供语音/数据专线、互联网接入、企业虚拟专用网（VPN）、电子商务、企业通信整合、通信项目的设计/施工及楼宇/住宅通信配套，并根据客户需求提供定制化的增值电信服务，辅助客户通过海邻电讯搭建的通信桥梁，沟通无限。
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