1. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design

2. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual LAN Design Goals Functionality –The network must work. Scalability –The network must be able to grow and contract to meet the needs of the organization. Adaptability –The network must adapt to new technologies. Manageability –The network must support network monitoring and management.

3. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Critical Components of LAN Design Function and Placement of Servers Intranets Collision Detection (Ethernet) Segmentation Bandwidth Versus Broadcast Domains

4. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Server Placement Servers can be categorized into two distinct classes: –Enterprise servers –Workgroup (departmental) servers

5. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Intranets Centralized Web Servers (Comparable to Enterprise Servers) Limited to Internal Users –Those that have logged in to corporate network Accessed by Web Browser Many Day-to-Day Job Functions on the Web

6. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Collision Detection (Ethernet) Legacy Ethernet –Contention refers to excessive collisions caused by too many devices vying for services. –Broadcasts becomes excessive when: Too many client packets looking for services Too many server packets announcing services Too many routing table updates Too many broadcast-dependent protocols, such as ARP, DHCP, and so forth

7. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Broadcast and Collision Domains

8. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Network Design Methodology Gathering Requirements Analyzing Requirements Designing the Network Topology –Designing the Layer 1, 2, and 3 LAN structure –Documenting the logical and physical network

9. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Gathering Requirements Who will be using the network? –What resources do they need to access? –What is their level of skill? –What are their attitudes toward computers and applications? What data and processes are mission-critical? What protocols are allowed on the network? What desktop hosts (OSs) are supported? Who has authority over addressing, naming, topology design, and configuration? What about the existing computer hardware and software? –How are these resources currently linked and shared? What financial resources are available? –Who controls these resources?

10. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Develop a Physical Topology

11. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual OSI Layer 1, 2, and 3 Issues

12. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Layer 1 Topology: Signaling Method, Medium Type, and Maximum Length

13. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual MDF in a Star Topology

14. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual MDFs and IDFs

15. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Extended Star

16. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual 10BaseT, 100BaseTX, and 1000BaseX Ethernet 10 Mbps (and 100 Mbps) to desktops Vertical cabling 100 Mbps (or Gigabit) between MDFs and IDFs 100 Mbps (or Gigabit) server to network Often multiple links combined into channels to provide increased bandwidth in vertical runs and server connections Fast Ethernet or Gigabit Ethernet

17. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Elements of a Logical Topology Diagram

18. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Cut Sheet

19. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Select Layer 2 Devices

20. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Asymmetric Switching

21. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Switches to Reduce Congestion

22. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Determining the Number of Cable Runs and Drops

23. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Hubs Share (Split) Bandwidth

24. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Switches, Hubs, and Collision Domains Switches combined with full-duplex create collision-free domains.

25. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Layer 3 Design

26. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual VLANs in the Design

27. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Routers Provides Logical Structure to a Network

28. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Diagramming a Standards- Based LAN with Routers

29. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Logical Maps

30. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Addressing Maps

31. www.ciscopress.com Copyright 2002Cisco Press: CCNA Instructor’s Manual Physical Maps