WAN Concepts

WAN Concepts

1. Purpose of WANs

   • LANs and WANs
   • Private and Public WANs
   • Carrier Connections
     • Single-Carrier WAN Connection
     • Dual-Carrier WAN Connection

2. WAN Topologies

   • Point-to-Point Topology
   • Dual-homed Topology
   • Fully Meshed Topology
   • Hub-and-Spoke Topology
   • Partially Meshed Topology

3. Evolving Networks

   • Small Network
   • Campus Network
   • Branch Network
   • Distributed Network

4. WAN Operations

   • WAN Standards
     • Recognized authorities
       • TIA/EIA
       • ISO
       • IEEE
   • Packet-Switched Communications
     • Serial Communication
       • Circuit-Switched Communication
         • Public Service Telephone Network (PSTN)
           • Integrated Services Digital Network (ISDN)
     • Frame Relay
     • Asynchronous Transfer Mode (ATM)
   • SDH, SONET, and DWDM

5. WANs in the OSI Model

   • Physical
   • Data link

6. Common WAN Terminology

   • Data Terminal Equipment (DTE) Data Communications Equipment (DCE) Customer Premises Equipment (CPE) Point-of-Presence (POP) Demarcation Point Local Loop (or last mile) Central Office (CO) Toll network Backhaul network Backbone network

7. WAN Devices

   • Voiceband Modem
     • DSL Modem and Cable Modem
       • CSU/DSU
         • Optical Converter
           • Wireless Router or Access Point
             • WAN Core devices

8. Traditional WAN Connectivity Option

   • Delicated
     • Leased Line
       • T1/T3
         • E1/E3
   • Switched
     • Circuit-Switched
       • PSTN,ISDN
     • Packet-Switched
       • Frame Relay ATM

9. Modern WANs

   • Dedicated
     • Broadband
       • Dark Fiber
   • Switched
     • Packet-Switched
       • Ethernet WAN MPLS
   • Internet-Based
     • Broadband VPN
       • Wired
       • Wireless
   • Ethernet WAN
     • Metropolitan Ethernet (Metro E) Ethernet over MPLS (EoMPLS) Virtual Private LAN Service (VPLS)
   • MPLS

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