1. Network Communications Technology Chapter 19 Internet Architecture and TCP/IP

2. Connecting a Network to the Internet Token Ring Internal Gateway Ethernet Internet External Gateway Figure 19.1

3. NSFNET Backbone (1993) Figure 19.2

4. GTE Internet Backbone (2000) Figure 19.3:

5. TCP/IP Reference Model Figure 19.4

6. TCP/IP Protocols Internet Protocol (IP)Packet Delivery between Networks Internet Control Message Transmission and Message Control Protocol (ICMP) between Hosts and Gateways Address Resolution ProtocolRequest Physical Address from (ARP) Source Reverse ARPARP Response User Datagram Protocol Best Effort Service (Connectionless, (UDP) no Acknowledgement) Transmission Control Protocol Reliable Service (Connection) (TCP) Simple Network Management Diagnostics Protocol (SNMP) Table 19.1

7. TCP/IP Application Level Simple Mail Transfer Protocol (SMPT, Port 25) –Send email –POP3 (port 110) for access to received email Telnet – Remote login (port 23) File Transfer Protocol (FTP, port 20,21, more) HTTP – Web Pages (Client/Server, port 80) Domain Name System (DNS)

8. DNS Top-Level Domain Names More now exist tv, etc Figure 19.5

9. UDP Operation Figure 19.6

10. UDP Packet Format Figure 19.7

11. TCP Operation Figure 19.8

12. TCP Packet Format Figure 19.9

13. IP Datagram Packet Protocol Figure 19.10

14. ARP Packet Format Figure 19.11

15. ARP / RARP Figure 19.12: IPv4 MAC

16. A Network Figure: 19.13

17. IPv4 Addresses Class A – 1.0.0.0 to 126.255.255.255 –126 large organizations (all gone) Class B – 128.0.0.0 to 191.255.255.255 –2 14 networks each with 2 16 hosts Class C – 192.0.0.0 to 223.255.255.255 –2 21 small networks, 255 hosts

18. Address Mask Separates a network address from the Host address Figure: 19.14

19. Point-to-Point Protocol Packet Format Figure 19.15

20. Demultiplexing Information Figure 19.16:

21. Setting up a TCP Connection Figure 19.17:

22. Disconnecting a TCP Connection Figure 19.18:

23. IPv6 Format Figure 19.19:

24. IP Datagram Extension Headers Figure 19.20:

25. IPv6 Unicast Address Figure 19.21: MAC

26. IPv4 to IPv6 Migration Figure 19.22a: IPv4 Imbedded in IPv6 Figure 19.22b: For Station w/o IPv6 Support

27. vBNS Backbone (2000) Figure 19.23: