Chapter 1 landesign

  • 529 views
Uploaded on

 

  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
  • THANKS =)
    Are you sure you want to
    Your message goes here
No Downloads

Views

Total Views
529
On Slideshare
0
From Embeds
0
Number of Embeds
0

Actions

Shares
Downloads
58
Comments
1
Likes
1

Embeds 0

No embeds

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
    No notes for slide

Transcript

  • 1. LAN design CCNA Exploration Semester 3 Chapter 130 Sep 2012 S Ward Abingdon and Witney College 1
  • 2. Topics Networks and business needs The 3-level hierarchical network design model Including voice and video over IP in the design Devices at each layer of the hierarchy Cisco switches for each layer 2 30 Sep 2012 S Ward Abingdon and Witney College
  • 3. Semester 3 LAN Design Basic Switch Wireless ConceptsVLANs STPVTP Inter-VLAN routing 330 Sep 2012 S Ward Abingdon and Witney College
  • 4. Hierarchical design model 430 Sep 2012 S Ward Abingdon and Witney College
  • 5. Hierarchical design modelHigh speed backbone. 5 30 Sep 2012 S Ward Abingdon and Witney College
  • 6. Hierarchical design modelSubnets, VLANs, routing, flow control,security. 630 Sep 2012 S Ward Abingdon and Witney College
  • 7. Hierarchical design modelConnects end devices. Controls whichdevices connect. 7 30 Sep 2012 S Ward Abingdon and Witney College
  • 8. Collapsed core Small network: merged core and distribution 8 30 Sep 2012 S Ward Abingdon and Witney College
  • 9. Logical and physical layout Logical – how they connect. Physical – where they are. Logical connections not obvious from looking. 9 30 Sep 2012 S Ward Abingdon and Witney College
  • 10. Benefits of Hierarchical Network Scalability– easy to expand Redundancy – at core and distribution layers Performance – route packets through fast devices Security – at access and distribution layers Manageability – similar functions within layer Maintainability - modular 10 30 Sep 2012 S Ward Abingdon and Witney College
  • 11. Design principles Network diameter – how many devices must packet pass through? Keep it low. Bandwidth aggregation – combine ports where high bandwidth is needed. Redundant links/devices – in core and distribution layers. Too expensive for access. Start design at the access layer. How many devices, how much bandwidth needed? 11 30 Sep 2012 S Ward Abingdon and Witney College
  • 12. Converged network Combines data, voice, video. (Not converged as in “all routers have consistent information”. Same word used.) Needs quality of service (QoS) to give priority to voice and video. Was very expensive, needed expertise, needed to replace legacy equipment. Now more affordable. 12 30 Sep 2012 S Ward Abingdon and Witney College
  • 13. Advantages of converged network One network to manage/ keep up to date One set of cabling and networking devices One group of people to run it One service provider Can have voice and video on PC using headset, webcam and software – no separate equipment. 13 30 Sep 2012 S Ward Abingdon and Witney College
  • 14. Choosing switches Carry out Traffic Flow Analysis using software to monitor amount and source of traffic. Allow for growth. Carry out User Communities Analysis. Group by job function. How many ports? How much bandwidth? Allow for growth. Carry out Data Stores and Data Servers analysis. Traffic to, from, between. 14 30 Sep 2012 S Ward Abingdon and Witney College
  • 15. Topology DiagramPorts? Layers?Bandwidth? Routes?Bottlenecks? Redundancy? 15 30 Sep 2012 S Ward Abingdon and Witney College
  • 16. Topology DiagramPorts? Layers?Bandwidth? Routes?Bottlenecks? Redundancy? Document it now 16 30 Sep 2012 S Ward Abingdon and Witney College
  • 17. Choosing switches (contd) 1 rack unit (1U)Form factor Fixed configuration – ports on chassis Modular – ports on cards Stackable – act as one switch, linked by special ports. 17 30 Sep 2012 S Ward Abingdon and Witney College
  • 18. Choosing switches (contd) Port density – how many ports? (Allow for links between switches.) Forwarding rate – How many Gbps can it process? Can all ports work simultaneously at maximum speed? Link aggregation (EtherChannel) – up to 8 ports bound together, acting as one, with combined bandwidth – can it do this? 18 30 Sep 2012 S Ward Abingdon and Witney College
  • 19. Choosing switches (contd) Power over Ethernet (PoE) for IP phones, network access points. Do you need it? It adds to the cost. Multilayer switch needed? Typical switch works at Data Link layer (2), uses MAC addresses. Multilayer also works at Network layer (3), routes between subnets. 19 30 Sep 2012 S Ward Abingdon and Witney College
  • 20. Access Layer Switch Features Port security – choose which devices may connect. All Cisco switches support this. VLANs – connected devices on different subnets. Speed – Fast Ethernet (100Mbps) or Gigabit. Power over Ethernet (PoE) – expensive Link aggregation – for uplinks Quality of service (QoS) if needed 20 30 Sep 2012 S Ward Abingdon and Witney College
  • 21. Distribution Layer Switch Features Layer 3 support – route between VLANs High forwarding rate (processing) Port speed Gbps, 10Gbps ports Redundancy Security – Access control lists Link aggregation Quality of service Availability. Hot swappable power supply? 21 30 Sep 2012 S Ward Abingdon and Witney College
  • 22. Core Layer Switch Features Support for Network layer (3) - routing Very high forwarding rate Very high port speed (1Gbps, 10Gbps) Redundancy Link aggregation Quality of service Avoid security and other distractions here. Go for speed. 22 30 Sep 2012 S Ward Abingdon and Witney College
  • 23. Catalyst Switch product lines 2330 Sep 2012 S Ward Abingdon and Witney College
  • 24. Catalyst Switch product lines Concentrate on general features 2430 Sep 2012 S Ward Abingdon and Witney College
  • 25. The End30 Sep 2012 S Ward Abingdon and Witney College 25