协议
| 数据链路协议 |
NHRP,mGRE,IPSec VPN,DMPVN |
| 管理协议 |
SNMP,Telnet |
其他功能
| 接口 |
RJ-45 |
| 网路功能 |
WAN,LAN,VPN |
2621XM VPN Bundle AIM-VPN EP 2FE IOS FW IPSec 3DES 128DRAM
Virtual private networks (VPNs) allow organizations to securely connect remote offices and remote users using cost-effective, third-party Internet access rather than expensive dedicated WAN links. By deploying VPNs over high-bandwidth transport such as DSL, Ethernet, and cable, organizations can easily reduce their connectivity costs while simultaneously increasing remote connection bandwidth. VPNs are an alternative to Frame Relay and leased-line WAN infrastructures used to provide network connectivity for branch offices, home office intranets, and business partner extranets. Encrypted VPNs also provide the highest possible level of security through advanced encryption and authentication protocols to protect data from unauthorized access. With encrypted VPNs, corporations are able to increase the capacity of data, users, and connections, without significantly adding to an existing infrastructure. Encrypted VPNs provide more flexibility and scalability than Frame Relay and leased-line connections by enabling corporations to take advantage of the easy-to-provision Internet infrastructure within ISPs and easily add new users. As a result, corporations are able to dramatically increase capacity without the need to significantly expand infrastructure.
There are two types of encrypted VPNs: site-to-site VPNs and remote-access VPNs.
Site-to-site encrypted VPNs provide the same benefits as a private WAN, ensuring private communications from one trusted site to another, providing multiprotocol support, high reliability, and extensive scalability. In addition, site-to-site encrypted VPNs are cost effective, secure, and allow for greater administrative flexibility than legacy private WANs.
Remote-access VPNs are also a flexible and cost-effective alternative to private dialup solutions, and, in fact, VPNs have become the logical solution for remote access connectivity. Deploying a remote-access VPN helps reduce organizations' communications expenses by using the local dialup infrastructures of ISPs. Similarly, remote-access VPNs allow mobile workers, telecommuters, partners, and day extenders to take advantage of broadband connectivity.
