Copyright 2002 Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design By Carl Marandola.
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Copyright 2002 Year 2 - Chapter 4/Cisco 3 - Module 4 LAN Design By Carl Marandola
Copyright 2002 Objectives Explain LAN design goals Identify LAN design issues Explain network design methodology Describe how to gather and analyze network equipment Identify Layer 1 (media and topology) design issues Identify Layer 2 (LAN switching) design issues Identify Layer 3 (routing) design issues Describe the physical and logical network implementation documentation
Copyright 2002 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.
Copyright 2002 Critical Components of LAN Design Function and Placement of Servers Intranets Collision Detection (Ethernet) Segmentation Bandwidth Versus Broadcast Domains
Copyright 2002 Server Placement Servers can be categorized into two distinct classes: –Enterprise servers –Workgroup (departmental) servers
Copyright 2002 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
Copyright 2002 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
Copyright 2002 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
Copyright 2002 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?
Copyright 2002 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
Copyright 2002 Elements of a Logical Topology Diagram