The two approaches effectively balanced the overhead of IPsec VPN gateway, speeded up the authentication process and improved the timeliness of CRLs a lot.
这两种方案能有效平衡网关开销、提高认证速度并能较大提高有效CRL的及时性。
Some form of network-level encryption, such as a Virtual Private Network (VPN), perhaps using IP Security Protocol (IPSEC), is the most obvious solution, although there are other reasonable choices.
某种可能使用 IP 安全性协议 (IPSEC) 的网络级加密形式（例如虚拟专用网 (VPN)）是最可取的解决方案，虽然也有其他合理的选择。
This paper is mainly on the subject how to consider efficiency and security of transport as a whole, and presents a VPN scheme including the advantages of IPSEC and MPLS.
本文主要研究VPN的传输效率与安全性如何两者兼顾的问题，在IPSEC和MPLS之间提出了一种各取所长的VPN解决方案。
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