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LAN DESIGN. Functionality - the network must work with reasonable speed and reliability. Scalability - the network must be able to grow without any major changes to the overall design.

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Functionality the network must work with reasonable speed and reliability l.jpg
Functionality - the network must work with reasonable speed and reliability


Scalability the network must be able to grow without any major changes to the overall design l.jpg
Scalability - the network must be able to grow without any major changes to the overall design


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Adaptability - the network should include no element that would limit use of new technologies as they become available


Manageability the network must be able to allow ease of monitoring and managing l.jpg
Manageability - the network must be able to allow ease of monitoring and managing



Enterprise servers support all users by offering services that everyone would need l.jpg
Enterprise servers support ALL users by offering services that everyone would need


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Workgroup servers support only a specific group of users, offering services that only a few groups of people would need


Placement of servers l.jpg
PLACEMENT OF SERVERS:

  • ENTERPRISE - MDF

  • WORKGROUP - IDF


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When configuring an Intranet (used only by those with access to the LAN) the following should be considered:

  • faster connectivity for desktops

  • server privileges for users

  • type of data to be accessed


Broadcasts become excessive when there are l.jpg
Broadcasts become excessive when there are

  • too many client packets looking for services

  • too many server packets announcing services

  • too many routing table updates

  • broadcasts dependent on protocols (e.g.ARP)


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Segmentation - the process of splitting a single collision domain into two or more collision domains. Layer 2 bridges and switches are used for this process



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A not.bandwidth domain is everything associated with one port on a bridge or switch. In the case of an Ethernet switch, a bandwidth domain is also known as a collision domain.


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When designing a network, the physical cabling is one of the most important components to be considered


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In a simple star topology the HCC patch cables are used to connect the Layer 1 horizontal cabling with the Layer 2 switch ports


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In an extended star topology, when more wiring closets are created, multiple catchment areas are also created. (A catchment area is a zone that falls within an area that can be served by an internetworking device such as a hub)



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In an ideal situation, the size of the collision domain is 2 (the source host and the destination host)


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Using Layer 3 devices, such as routers, allows for segmentation of the LAN into unique PHYSICAL and LOGICAL networks


Routers provide communication between vlans l.jpg
Routers provide communication between VLANs segmentation of the LAN into unique PHYSICAL and LOGICAL networks


Vlans provide broadcast containment and security l.jpg
VLANs provide broadcast containment and security segmentation of the LAN into unique PHYSICAL and LOGICAL networks


Similarities between hubs and switches l.jpg
Similarities between hubs and switches segmentation of the LAN into unique PHYSICAL and LOGICAL networks

  • connection ports

  • LAN domain

  • connectivity to backbone

  • manageable devices


Differences l.jpg
Differences segmentation of the LAN into unique PHYSICAL and LOGICAL networks

  • Hubs have only an IOS subset image while switches have a full IOS image

  • Hubs have a slow CPU while switches have a fast CPU

  • Hubs have small memory while switches have buffer memory

  • A hub is an indiscriminate repeater while a switch is port-targeted


Do hubs still play an important part in switched networks l.jpg
Do Hubs still play an important part in switched networks? segmentation of the LAN into unique PHYSICAL and LOGICAL networks

  • YES! Hubs have gotten smarter and cheaper over the years. They continue to be used for enterprise work groups and small companies.


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