year 2 - chapter 4/cisco 3 - module 4 lan design
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Year 2 - Chapter 4/Cisco 3 - Module 4
LAN Design
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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.
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Critical Components of LAN Design
• Function and Placement of Servers• Intranets• Collision Detection (Ethernet)• Segmentation• Bandwidth Versus Broadcast Domains
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Server Placement
• Servers can be categorized into two distinct classes:– Enterprise servers
– Workgroup (departmental) servers
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Broadcast and Collision Domains
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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?
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Develop a Physical Topology
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OSI Layer 1, 2, and 3 Issues
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Layer 1 Topology: Signaling Method, Medium Type, and Maximum Length
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
MDF in a Star Topology
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
MDFs and IDFs
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Extended Star
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
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
Fast Ethernet or Gigabit Ethernet
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Elements of a Logical Topology Diagram
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Cut Sheet
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Select Layer 2 Devices
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Asymmetric Switching
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Switches to Reduce Congestion
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Determining the Number of Cable Runs and Drops
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Hubs Share (Split) Bandwidth
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Copyright 2002 Cisco Press: CCNA Instructor’s Manual www.ciscopress.com
Switches, Hubs, and Collision Domains
Switches combined with full-duplex create collision-free domains.
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Layer 3 Design
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VLANs in the Design
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Routers Provides Logical Structure to a Network
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Diagramming a Standards-Based LAN with Routers
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Logical Maps
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Addressing Maps
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Physical Maps