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SJW-22-2–1...............................................32SJW22......................................52.1SJW22...............................52.2SJW22...............................52.3SJW22...............................72.4SJW22..............................103SJW22...............................123.1.......................................123.2.......................................123.3.......................................123.4.......................................123.5......................................133.6...........................133.7...............................133.8..................................134......................................145VPN...................................165.1.....................................165.2.................................21-3–1VPNVPNVirtualPrivateNetwork(Internet)(PrivateNetwork)Internet1998-4–SJW22-5–2SJW222.1SJW22SJW22SJW22SJW222.2SJW221SJW22-6–10242SJW22SJW2234SJW22-7–85SJW226SJW222.3SJW221.IPSecIPSECAHESPIKE-8–IPIPSECIPIPIP2.InternetSJW22128SJW22IPIPSJW22HASH3.RSAPIN-9–VPN4.5.BTPPFSDiffie-Hellman,(back-trafficprotection,BTP)(perfect-forwardsecrecy,PFS),,,6.SJW22,-10–7.SJW228.SJW22SJW22SJW222.4SJW221IPSEC2SJW22ISAKMP/OAKLEYISAKMP/IKE,-11–34,,56USB782048123310/100BASE-TX5-12–3SJW223.13.2Windows3.33.3.110/100Base-TXCONSOLE3.3.210/100BaseTXCONSOLERS232CDTE9600-8-N-13.4220V/50HZ3.0A260W-13–1535-25552093%@403.5Q/TFAJ1-20013.6GB/T2423.2-1989GB/T2423.3-1993GB/T2423.10-1989GB4943-1995GB9254-1998GB/T17618-19983.7TCPUPDICMPHTTPFTPSMTPDNSFingerGopherTelnetRealAudioRealVideoNNTPPOP3NetBEUI3.8MTBF100,00010Mbps100Mbps1024-14–4SJW22,()SJW22SJW22SJW22SJW22...SJW221.-15–2.3.4.5.6.-16–5VPNInternetInternetVPNVPNVPNVPNVPNVPN5.1VPNVPN-17–InternetIPIPVPNIPInternetIPVPNTITTVPNVPNVPN-18–VPNVPNInternet(IETF)(PPTP)L2FL2TPVTPIPIPSecIPSecIPSecIPIPSecIPIPv4IPIPv6IPSecIPTCPUDPICMPIPSecIPIPSecTCP/IPIPSecAuthentication&IntegrityConfidentialityAuthenticationIntegrity-19–Confidentiality(EncryptionIPSecIPSecIPSecIPSecESPAHIPIPIPSecIPIPIPSecIPIPIPIPSecAHESPIP-20–IPAHIPESPIPESPIPTCPUDPESPIPTCP/IPUDP/IPIPESPAHIPSec-21–5.2VPN-22–RSASJW222048RSARSA128-23–59314A8621-240282608621-24028269200020