Wide-Area Networks

Wide-Area Networks

1. Introducing Wide-Area Networks

   • Basic Telco Services
     • Switched Analog Circuits for Voice and Data
       • Digital Circuits and Leased Lines
         • Switched Circuits and Circuit Swiching
           • Content-Aware Telco: Packet Switching
             • Using Routers to Send IP Packets over WANs
               • Routers Connect LANs to WANs
                 • Encapsulation and deencapsulation
                   • WAN and LAN Topologies
                     • Point-to-Point Topologies
                       • Hub-Spoke Topologies
                         • Multipoint Topologies
                           • Understanding Leased-Line WAN Links
                             • Customer Perspective on Physical Leased Lines
                               • Distance Limitations
                                 • Speeds
                                   • Cabling
                                     • Channel Service Unit / Data Service Unit
                                       • Summary of the Customer Ends of a Leased Line
                                         • • The T-Carrier System and TDM
                                             • The Challenge: Too Many Between Sites
                                               • Making Efficient Use of Trunks with Time-Division Multiplexing
                                                 • TDM Switches and Mapping T1s to T3 Channel
                                                   • T1 and the Role of the CSU/DSU
                                                     • Different views of Bit Rates: Routers Versus CSU/DSU
                                                       • Controlling Leased Lines with Data-Link Protocols