1. Chapter 1. Introduction Data Communications
Data Communications Networking
Protocols and Protocol Architecture
Standards Organizations
Outline of the book

2. Data Communications

3. Data Comm. Networking

4. Wide-Area Networks Interconnected switching nodes Techniques
Circuit switching
Packet switching
Frame relay
ATM Networks
ISDN, Broadband ISDN

5. Wide-Area Networks (cont)
Circuit Switching
dedicated communications path
e.g. telephone network
Packet Switching
packets
store-and-forward
Frame Relay
for high data rate and low error rate
little overhead and error control
up to 2Mbps

6. Wide-Area Networks (cont)
ATM Networks
cell relay
evolution from Frame relay
little overhead and error control
variable length frames  fixed size cells
evolution from Circuit switching
constant-data-rate channel via packet switching tech.
dynamic allocation of data rates
10s ~ 100s Mbps

7. Local Area Networks Key distinctions between LANs and WANs
Different geographic scope  different tech.
Greater data rates of LANs
Ownership
Broadcast network approach
Switched LANs

8. Protocol Architecture
Three layer model
Computer 1
Computer 2
Application protocol
Application
Application
Transport protocol
Transport
Transport
Network access
Network
Network access
Network access protocol

10. TCP/IP Protocol Architecture

11. OSI Layers Applications layer Presentation layer Session layer
Transport layer
Network layer
Data link layer
Physical layer

12. TCP/IP v.s. OSI
Network
Access

13. Standards Organizations
IETF
Internet Engineering Task Force
subsidiary task force of IAB (Internet Architecture Board)
Request for Comments (RFCs)
ISO
International Organization for Standardization
U.S. member body: ANSI (American National Standards Institute)

14. Standards Organizations (cont)
ITU-T
ITU Telecommunications Standardization Sector
replaces CCITT (International Telegraph and Telephone Consultative Committee)
ATM Forum

15. Outline of the Book Protocols and Architecture Data Transmission
OSI 7-layer RM
TCP/IP model
Data Transmission
behavior of data signals
Transmission Media
guided or wireless
Data Encoding
analog and digital data/signal

16. Outline of the Book (cont)
Data Communication Interface
asynchronous and synchronous tx
Data Link Control
HDLC
Multiplexing
FDM, TDM
Circuit Switching
switch operations

17. Outline of the Book (cont)
Packet Switching
routing, congestion control
Frame Relay, ATM
LAN Technology and Systems
LAN topologies
Ethernet, Token Ring/Bus, FDDI, 100VG
Bridges
Interconnection of LANs

18. Outline of the Book (cont)
Internetworking
Internet Protocol (IP), IPv6, ICMP
Routing protocols, IGMP, RSVP
Transport Protocols
TCP, UDP
Network Security
DES, RSA encryption algorithms

19. Outline of the Book (cont)
Distributed Applications
Network management
World-wide web
ISDN and B-ISDN