LAN design              CCNA Exploration Semester 3                                Chapter 130 Sep 2012             S Ward...
Topics Networks  and business needs The 3-level hierarchical network design  model Including voice and video over IP in...
Semester 3                 LAN Design  Basic Switch                      Wireless  ConceptsVLANs                  STPVTP  ...
Hierarchical design model                                    430 Sep 2012   S Ward Abingdon and              Witney College
Hierarchical design modelHigh speed backbone.                                        5  30 Sep 2012     S Ward Abingdon an...
Hierarchical design modelSubnets, VLANs, routing, flow control,security.                                         630 Sep 2...
Hierarchical design modelConnects end devices. Controls whichdevices connect.                                        7 30 ...
Collapsed core Small   network: merged core and distribution                                             8 30 Sep 2012   ...
Logical and physical layout Logical – how  they connect. Physical – where  they are. Logical  connections not  obvious ...
Benefits of Hierarchical Network Scalability– easy to expand Redundancy – at core and distribution layers Performance –...
Design principles Network    diameter – how many devices must  packet pass through? Keep it low. Bandwidth aggregation –...
Converged network Combines   data, voice, video. (Not converged as in “all routers have  consistent information”. Same w...
Advantages of converged network One network to manage/ keep up to date One set of cabling and networking devices One gr...
Choosing switches Carry   out Traffic Flow Analysis using  software to monitor amount and source of  traffic. Allow for g...
Topology DiagramPorts?                                Layers?Bandwidth?                            Routes?Bottlenecks?    ...
Topology DiagramPorts?                                Layers?Bandwidth?                            Routes?Bottlenecks?    ...
Choosing switches (contd)                            1 rack unit (1U)Form factor Fixed configuration  – ports on chassis...
Choosing switches (contd) Port  density – how many ports? (Allow for  links between switches.) Forwarding rate – How man...
Choosing switches (contd) Power   over Ethernet (PoE) for IP phones,  network access points. Do you need it? It  adds to ...
Access Layer Switch Features Port security – choose which devices may  connect. All Cisco switches support this. VLANs –...
Distribution Layer Switch Features Layer 3 support – route between VLANs High forwarding rate (processing) Port speed G...
Core Layer Switch Features Support  for Network layer (3) - routing Very high forwarding rate Very high port speed (1Gb...
Catalyst Switch product lines                                    2330 Sep 2012   S Ward Abingdon and              Witney C...
Catalyst Switch product lines                Concentrate                 on general                  features             ...
The End30 Sep 2012   S Ward Abingdon and Witney College       25
Upcoming SlideShare
Loading in …5
×

Chapter 1 landesign

966 views

Published on

1 Comment
1 Like
Statistics
Notes
  • THANKS =)
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total views
966
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
68
Comments
1
Likes
1
Embeds 0
No embeds

No notes for slide

Chapter 1 landesign

  1. 1. LAN design CCNA Exploration Semester 3 Chapter 130 Sep 2012 S Ward Abingdon and Witney College 1
  2. 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. 3. Semester 3 LAN Design Basic Switch Wireless ConceptsVLANs STPVTP Inter-VLAN routing 330 Sep 2012 S Ward Abingdon and Witney College
  4. 4. Hierarchical design model 430 Sep 2012 S Ward Abingdon and Witney College
  5. 5. Hierarchical design modelHigh speed backbone. 5 30 Sep 2012 S Ward Abingdon and Witney College
  6. 6. Hierarchical design modelSubnets, VLANs, routing, flow control,security. 630 Sep 2012 S Ward Abingdon and Witney College
  7. 7. Hierarchical design modelConnects end devices. Controls whichdevices connect. 7 30 Sep 2012 S Ward Abingdon and Witney College
  8. 8. Collapsed core Small network: merged core and distribution 8 30 Sep 2012 S Ward Abingdon and Witney College
  9. 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. 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. 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. 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. 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. 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. 15. Topology DiagramPorts? Layers?Bandwidth? Routes?Bottlenecks? Redundancy? 15 30 Sep 2012 S Ward Abingdon and Witney College
  16. 16. Topology DiagramPorts? Layers?Bandwidth? Routes?Bottlenecks? Redundancy? Document it now 16 30 Sep 2012 S Ward Abingdon and Witney College
  17. 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. 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. 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. 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. 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. 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. 23. Catalyst Switch product lines 2330 Sep 2012 S Ward Abingdon and Witney College
  24. 24. Catalyst Switch product lines Concentrate on general features 2430 Sep 2012 S Ward Abingdon and Witney College
  25. 25. The End30 Sep 2012 S Ward Abingdon and Witney College 25

×