1 IPv6 JPNIC UNI NNI WS PC PDA bit 1 1000 N F O A 1996 264 2000/5/1) PC OS AP NW 7753 2000/5/1) NW PC ID IP 4 2 vs ISAP T.30 FAX AAL ATM(PVC) FR(PVC) TCP UDP IPv4 IPv6 SMTP POP PPTP L2TP 2 PPP 3 Ether PPP PPTP TCP/IP Protocols Suite Vertical ITU HTTPS HTTP HDLC HDLC PPP DNS ICMP nslookup Eudora Web UNI C AS B NNI D AS0002 Gateway EGP GBP4 IGP RIP,OSPF,IS-IS A UNI E AS9605 Gateway EGP GBP4 AS AS 3