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Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design

Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design. 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

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Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design

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

  2. 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. Cisco Press: CCNA Instructor’s Manual

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

  4. Server Placement • Servers can be categorized into two distinct classes: • Enterprise servers • Workgroup (departmental) servers Cisco Press: CCNA Instructor’s Manual

  5. 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 Cisco Press: CCNA Instructor’s Manual

  6. 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 Cisco Press: CCNA Instructor’s Manual

  7. Broadcast and Collision Domains Cisco Press: CCNA Instructor’s Manual

  8. 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 Cisco Press: CCNA Instructor’s Manual

  9. 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? Cisco Press: CCNA Instructor’s Manual

  10. Develop a Physical Topology Cisco Press: CCNA Instructor’s Manual

  11. OSI Layer 1, 2, and 3 Issues Cisco Press: CCNA Instructor’s Manual

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

  13. MDF in a Star Topology Cisco Press: CCNA Instructor’s Manual

  14. MDFs and IDFs Cisco Press: CCNA Instructor’s Manual

  15. Extended Star Cisco Press: CCNA Instructor’s Manual

  16. Fast Ethernet or Gigabit Ethernet Fast Ethernet or Gigabit Ethernet 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 Cisco Press: CCNA Instructor’s Manual

  17. Elements of a Logical Topology Diagram Cisco Press: CCNA Instructor’s Manual

  18. Cut Sheet Cisco Press: CCNA Instructor’s Manual

  19. Select Layer 2 Devices Cisco Press: CCNA Instructor’s Manual

  20. Asymmetric Switching Cisco Press: CCNA Instructor’s Manual

  21. Switches to Reduce Congestion Cisco Press: CCNA Instructor’s Manual

  22. Determining the Number of Cable Runs and Drops Cisco Press: CCNA Instructor’s Manual

  23. Hubs Share (Split) Bandwidth Cisco Press: CCNA Instructor’s Manual

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

  25. Layer 3 Design Cisco Press: CCNA Instructor’s Manual

  26. VLANs in the Design Cisco Press: CCNA Instructor’s Manual

  27. Routers Provides Logical Structure to a Network Cisco Press: CCNA Instructor’s Manual

  28. Diagramming a Standards-Based LAN with Routers Cisco Press: CCNA Instructor’s Manual

  29. Logical Maps Cisco Press: CCNA Instructor’s Manual

  30. Addressing Maps Cisco Press: CCNA Instructor’s Manual

  31. Physical Maps Cisco Press: CCNA Instructor’s Manual

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