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LAN DESIGN

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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LAN DESIGN

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  1. LAN DESIGN

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

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

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

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

  6. Servers can be of two types: enterprise and workgroup

  7. Enterprise servers support ALL users by offering services that everyone would need

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

  9. PLACEMENT OF SERVERS: • ENTERPRISE - MDF • WORKGROUP - IDF

  10. 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

  11. 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)

  12. 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

  13. Bridges and switches forward broadcast traffic; routers do not.

  14. 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.

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

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

  17. 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)

  18. The two most common layer 2 devices are bridges and LAN switches

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

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

  21. Routers provide communication between VLANs

  22. VLANs provide broadcast containment and security

  23. Similarities between hubs and switches • connection ports • LAN domain • connectivity to backbone • manageable devices

  24. Differences • 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

  25. 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.

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