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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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Presentation Transcript
Adaptability - the network should include no element that would limit use of new technologies as they become available
Workgroup servers support only a specific group of users, offering services that only a few groups of people would need
placement of servers
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
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)

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


A 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.

When designing a network, the physical cabling is one of the most important components to be considered
In a simple star topology the HCC patch cables are used to connect the Layer 1 horizontal cabling with the Layer 2 switch ports

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)

In an ideal situation, the size of the collision domain is 2 (the source host and the destination host)
Using Layer 3 devices, such as routers, allows for segmentation of the LAN into unique PHYSICAL and LOGICAL networks
similarities between hubs and switches
Similarities between hubs and switches
  • connection ports
  • LAN domain
  • connectivity to backbone
  • manageable devices
  • 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
Do Hubs still play an important part in switched networks?
  • YES! Hubs have gotten smarter and cheaper over the years. They continue to be used for enterprise work groups and small companies.