CCNA Discovery 3 - Chapter 7

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CCNA Discovery 3 - Chapter 7

  1. 1. Implementing Enterprise WAN Links Introducing Routing and Switching in the Enterprise – Chapter 7Version 4.0 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 1
  2. 2. Objectives Describe the features and benefits of common WAN connectivity options. Compare and configure common WAN encapsulations. Describe Frame Relay © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 2
  3. 3. Describe the Features and Benefits of Common WAN Connectivity Options Serial transmissions Match WAN technology to type of devices required © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 3
  4. 4. Describe the Features and Benefits ofCommon WAN Connectivity Options Translation device: modem Preparing the data: CSU/DSU Central Office (CO) and Customer Premises Equipment (CPE) Demarc © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 4
  5. 5. Describe the Features and Benefits of Common WAN Connectivity OptionsPhysical Layer standards: HSSI, V.35 Link speed: North America:T1, T3 Europe: E1, E3 © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 5
  6. 6. Describe the Features and Benefits ofCommon WAN Connectivity OptionsData link Layer standards: LAPF HDLC PPP © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 6
  7. 7. Describe the Features and Benefits ofCommon WAN Connectivity Options Modems enable POTS to be used for WAN connections Analog signals modulate a carrier wave in the speech band The modulated carrier wave carries information to destination across the telephone network Destination demodulates the carrier and extracts information Modems are also used for DSL and cable connections to ISP © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 7
  8. 8. Describe the Features and Benefits of Common WAN Connectivity Options DSO channel = time slice Fractional connections Time Division Multiplexing (TDM) Statistical Time Division Multiplexing (STDM) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 8
  9. 9. Describe the Features and Benefits of Common WAN Connectivity Options Circuit switching: Dedicated bandwidth Higher cost Higher level of security © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 9
  10. 10. Describe the Features and Benefits ofCommon WAN Connectivity Options Packet switching: Bandwidth efficiency Identifier on each packet Preconfigured, but non-exclusive, link Cell switching: high-speed packet switching © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 10
  11. 11. Describe the Features and Benefits ofCommon WAN Connectivity Options Virtual circuits Switched virtual circuits Permanent virtual circuits © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 11
  12. 12. Describe the Features and Benefits of Common WAN Connectivity Options Last mile and long range WAN technologies © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 12
  13. 13. Compare and Configure Common WAN Encapsulations Elements of Layer 2 encapsulations Flag Address Control Protocol Data FCS © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 13
  14. 14. Compare and Configure Common WAN Encapsulations Standard bit-oriented Layer 2 encapsulation: HDLC Cisco HDLC: additional Type field Default WAN encapsulation on Cisco devices Allows multiple Network Layer protocols to share a link © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 14
  15. 15. Compare and Configure Common WAN EncapsulationsPoint-to-Point Protocol) PPP: Multi-protocol datagrams Sub-protocols: LCP, NCP © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 15
  16. 16. Compare and Configure Common WAN Encapsulations Link Control Protocol options: authentication compression error detection multilink PPP callback © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 16
  17. 17. Compare and Configure Common WANEncapsulations Phases of PPP sessions: Link-establishment Authentication (optional) NCP negotiation © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 17
  18. 18. Compare and Configure Common WANEncapsulations Change encapsulation from HDLC to PPP on both ends of link Configure desired optional features © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 18
  19. 19. Compare and Configure Common WAN EncapsulationsVerification and troubleshooting commands: show interfaces serial show controllers debug serial interface debug ppp © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 19
  20. 20. Compare and Configure Common WAN Encapsulations Password Authentication Protocol (PAP) Challenge Handshake Authentication Protocol (CHAP) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 20
  21. 21. Describe Frame Relay Nonbroadcast multiaccess network Packet switching with variable length packets STDM Virtual circuit between two DTE devices © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 21
  22. 22. Describe Frame Relay Data link connection identifier (DLCI) Inverse ARP LMI © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 22
  23. 23. Describe Frame RelayService parameters: Committed information rate (CIR) Excess information rate (EIR) Discard eligible (DE) frames © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 23
  24. 24. Describe Frame RelayTraffic management: Forward explicit congestion notification (FECN) Backward explicit congestion notification (BECN) © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 24
  25. 25. Summary Circuit switching WAN technologies create a physical circuit between end devices before sending data Packet and cell switching WAN technologies use virtual circuits to send data across the network Layer 2 encapsulation changes as frames move across a WAN PPP permits many advanced features including authentication, compression, and load balancing Frame Relay is a packet switched technology using switched or permanent virtual circuits Frame Relay uses parameters such as CIR to establish the bandwidth used on each VC © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 25
  26. 26. © 2006 Cisco Systems, Inc. All rights reserved. Cisco Public 26

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