Introduction, Network Models,Physical Layer and Media,Data and Signals,Digital Transmission,Analog Transmission,Bandwidth Utilization: Multiplexing and Spreading,Transmission Media,Switching,Using Telephone and Cable Networksfor Data Transmission,Data Link Layer,Error Detection and Correction,Data Link Control,Multiple Access,Wired LANs: Ethernet,Wireless LANs,Connecting LANs, Backbone Networks, and Virtual LANs,Wireless WANs: Cellular Telephone and Satellite Networks,SONETISDH,Virtual-Circuit Nenvorks: Frame Relay and ATM,Network Layer,Netvvork Layer: Logical Addressing,Netvvork Layer: Internet Protocol,Network Layer: Address Mapping, Error Reporting and Multicasting,Network Layer: Delivery, Forwarding, and Routing,Transport Layer,Process-to-Process Delivery: UDP, TCP, and SCTP,Congestion Control and Quality Science,Application Layer,Domain Name System,Remote Logging, Electronic Mail and File Transfer,WWW and HTTP,Network Management: SNMP,Multimedia,Security,Cryptography, Network Security,Security in the Internet: IPSec, SSLlTLS, PCp, VPN and Firewalls.