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2008
Chapter 1: Lan Design
2EA/ICT4/Netwerkcomponenten
CCNA3: LAN Switching and wireless
[email protected]
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Objectives
Describe how a hierarchical network supports the voice, video
anddata needs of a small and medium-sized business.
Match the appropriate Cisco switch to each layer in
thehierarchical network design model.
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ACCESS LAYER
User to networkend devices
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DISTRIBUTION LAYER
Controls the flow of datapolicies/ACLs
broadcastcontainmentinter VLAN routing
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CORE LAYER
Connects to Internet
internetwork (sites)high speed backbone transportredundant
links
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Network diameter
How many Switches between 2 endpoints in the networkNOT
IMPORTANT in hirarchical design (distribution layer
seperatesbroadcastdomains)
Bandwidth aggregation (=etherchannel) Dual physical links become
1 logical link between switches to increase
bandwidth on a link !!
Redundant links (not at access layer becaus of cost)
Several links between the different layer switches
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Bandwidth aggregation (=etherchannel) Trunking
Stacking
How to improve performance?
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Describe the role of a converged network in supporting small
andmedium-sized (SMB) business voice, video, and data needs
Voordelen: 1 netwerk beheren, minder bekabelingevolutie naar all
in one: soft phone (no extra power needed from the switch
PoE)Nadelen: QoS en priorization of voice. Configuration is not
easy !
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Match the Appropriate Cisco Switch to each Layer inthe
Hierarchical Network Design Model
Bandwidth requirements for each layerTraffic flow analysis
tools
User communities analysis (groupings of users according
tofunctions and there impact on network performance).
Port density / modular or
stackable access layerswitches
Location of servers!
Workgroup servers
Enterprise servers
(small network diameter)
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Aggregate links to achieve bandwidth
Client server traffic Server server traffic
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Stackwisemax 9daisy chain
1 backplane=faster than connectingthrough switchports
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Switch specifications
1U (rack units): form factors
PoE : power over ethernet (for AP, IPphones)
Forwarding rate: how much data the switch can process /
second
Wire speed: theoretical max data rate of each port (limited by
enddevice / cable)
Port density: number of ports on 1 switch
Etherchannel: link aggregation (1 logical link)
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L3 versus multilayer switches
Layer 3 functions
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Match the Appropriate Cisco Switch to each Layer inthe
Hierarchical Network Design Model
Identify the Cisco switches used in SMB applications
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Summary
Hierarchical Design model addresses performance,
scalability,maintainability & manageability issues.
Traffic Analysis is used to monitor network performance.
Hierarchical Design Model is composed of 3 layers:
Access
Distribution
Core
Switches selected for each layer must meet the needs of
eachhierarchical layer as well as the needs of the business.
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Questions
Rollen van elke layer
Welke ander layered model ken jullie
Verschil logical design and physical design
Waarom is elk van de goals van network design zo belangrijk,
welkevoordelen geeft dit?
Welke switch zouden jullie in bepaalde situaties gebruiken?
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