1. INTEROP 88 Santa Clara 8 ports Ethernet Fan Out Unit (Excelan) Router (Cisco) Router (Cisco) Router (Cisco) Router (Proteon) TP GF Thin Thick Thin Thick Thin Router (IBM) NSS T1 Link NSFNET (Ann Arbor) BARRNETARPANETMILNET (NASA Ames) T1 Link Thick 802.5 Token RIng ProNET80 Optical LAN TP: Twisted Pair GF: Glass Fiber Router (Proteon) 51 exhibitors

2. INTEROP 89 San Jose T1 OSINET X.25 NSIBARRNETMILNET Amateur Packet Radio Link FEBA West ARPANET NSFNET INTEROP 89 Show and Telnet Email Center in Fairmont Hotel Exhibitors

3. INTEROP 91 San Jose Ether R San Jose Convention Center T1 Link Microwave 10Mbps Diamond Pavilion SMDS Demo R: Router Terminal Cluster R R R R R Ether ISDN Demo FR Demo Booths RRRRRRRRRRRRR FDDI Demo RR FDDI R R OSI Demo Terminal Cluster Token Ring Booths Token Ring Booths Ether R Fairmont Hotel Terminal Cluster Concourse NSFNET The Internet T1 Link BARRNET - 300 Exhibitors - Over 400 Subnets - Over 30 miles UTPs - Over 5 miles Fiber Cables - Over 4 miles STPs - With OSPF

4. INTEROP 92 Washington DC Hyon R: Router Terminal Cluster Token Ring A Subnet 6 Terminal Cluster NSFNET The Internet T1 Token Ring B Subnet 5 Subnet 4 Subnet 3 Subnet 2 Subnet 1 Subnet 11 Subnet 10 Subnet 9 Subnet 8 Subnet 7 Subnet 16 Subnet 15 Subnet 14 Subnet 13 Subnet 21 Subnet 20 Subnet 19 Subnet 18 R RRRRRRRR Subnet 17 Subnet 12 R R R FDDI Backbone ALTERNET T1 R WCC T1

5. INTEROP 93 Washington DC R: Router Terminal Cluster R Lobby R Hall BHall A Hall D Rib Group Hub R EtherFDDI R Rib Group Hub Rib Group Hub Rib Group Hub R EtherFDDI R Rib Group Hub NOC Rib Group Hub R EtherFDDI R Rib Group Hub Rib Group Hub R EtherFDDI R Rib Group Hub Rib Group Hub R EtherFDDI R Rib Group Hub R EtherFDDI R Rib Group Hub Terminal Cluster Lobby Terminal Cluster Renaissance Hotel ISP Token Ring Token Ring Token Ring