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NET 3710 WAN Data Networks

NET 3710 WAN Data Networks. Network Protocols. Protocols functions: Communication control – how to communicate (peer to peer, master/slave) Error detection/correction – how to check for and correct errors Link management – control traffic flow

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NET 3710 WAN Data Networks

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  1. NET 3710WAN Data Networks

  2. Network Protocols • Protocols functions: • Communication control – how to communicate (peer to peer, master/slave) • Error detection/correction – how to check for and correct errors • Link management – control traffic flow • Session variables – login, authentication of users, half or full duplex • Synchronization – transfer rates, timing • Addressing – unique ID for nodes; connection oriented (circuit), or connectionless (packet) • Routing – metrics on how best to route traffic • Data segmenting/reassembly – frames, cells, packets, header and trailer • Data formatting – Encryption and compression

  3. Data Network Types • LAN – Local Area Network • Within a building • WAN – Wide Area Network • Network connecting LANs in many different locations • Focus on WANs

  4. WAN Types • Types of WANs • Public – Internet • Private – Private line, VPN, MPLS

  5. XO IP Network • XO Network Maps

  6. IP • Internet Protocol (IP) mainly an addressing scheme • An IP address has two parts: the identifier of a particular network on the Internet and an identifier of the particular device (which can be a server or a workstation etc.) within that network. On the Internet itself - that is, between the routers that move packets from one point to another along the route - only the network part of the address is looked at. • IPv4 uses a 32 bit address • IPv6 uses a 128 bit address and provides for better QoS • IP address hard to remember so Domain Name Service (DNS) is used to translate names to IP addresses.

  7. Private WAN Types • *Private Line (point to point) – Layer 1 • Dedicated circuits between locations TDM or IP. TDM = T1/T3/OCx • Pros – secure, reliable, dedicated bandwidth not shared, supports any protocol • Cons – costly, many circuits to manage at hub or main location

  8. Private WAN Types • *Ethernet (WAN) • Old layer 2 technology used on LANs • Newer to WAN environment • Implemented over SONET for protection or over DWDM backbones • 10/100/1000MB speeds • Interconnect LANs at Layer 2 • Point to point or switched (FE aggregation to GigE) • Pros – matching LAN speeds, simple, cheap (per MB), flat network • Cons – flat network

  9. Private WAN Types • Multiprotocol Label Switching (MPLS) • Layer 2 switching level • Semi private/shared network • Pros – utilizing existing backbone, scaleable, layer 2 – fast, one circuit to manage at HQ, cheaper than private line • Cons – shared type network, not dedicated

  10. Private WAN Types • *Virtual Private Network (VPN) • Layer 3 (IP) utilizing existing Internet • Traffic is encrypted for security • Hub and spoke or Meshed network • Pros – utilizing existing network (internet), scaleable, layer 3, better use of bandwidth • Cons – public network backbone, encryption overhead

  11. Network Convergence • Voice and data networks becoming one • More efficient and economical • Very attractive for branch office design • Using dedicated or private circuits VOIP works well. • Utilizing the Internet for VOIP is still unreliable.

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