1 / 24

CSIS 4823 Data Communications Networking – Designing Networks

CSIS 4823 Data Communications Networking – Designing Networks. Mr. Mark Welton. Network Designs. Three-tiered Architecture Collapsed core – no distribution Collapsed core – no distribution or access. Three-tiered Architecture. Most common design when network covers multiple buildings

edward
Télécharger la présentation

CSIS 4823 Data Communications Networking – Designing Networks

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CSIS 4823Data Communications Networking – Designing Networks Mr. Mark Welton

  2. Network Designs • Three-tiered Architecture • Collapsed core – no distribution • Collapsed core – no distribution or access

  3. Three-tiered Architecture • Most common design when network covers multiple buildings • Physical separation of the three levels usually occurs when there is a physical need to do so • Access devices are connected at the access-layer switches • These switches connect to the distribution-layer switches • Distribution-layer switches then connect to the core-layer • Internet and server farm (data center) typically connect to the core-layer

  4. Three-tiered Architecture

  5. Collapsed core – no distribution • Common in single building designs with multiple floors • Distribution-layer switches are removed and access layer goes directly in core • Distribution-layer maybe collapsed into the core-layer switches or removed completely

  6. Collapsed core – no distribution

  7. Collapsed core – no distribution or access • This design is most common in smaller implementations • Core switches act as all layers in the design • For this design Ethernet runs must remain within the distance limitations of the cable (100 Meters) • High-density chassis switches are used in this design

  8. Collapsed core – no distribution or access

  9. Configurations Concerns • Trunks – will be necessary anywhere switches are interconnected • EtherChannels or port aggregation – This allows multiple switch connections to increase bandwidth between switches • Spanning tree – end devices ports should not run spanning tree. Ports connecting other switches must run it and be configured correctly including setting a correct primary and secondary root bridge

  10. Configurations Concerns • VTP – allows for centralized control of VLAN in your network • VLAN – How many? Make sure they are planned out ahead of time • Internet • Internet inside • Server farm • User VLANS (include all user devices that need segmented i.e. VoIP) • OOB???

  11. Server Farm Design • Most web-based applications today use a three tier design • Internet Layer - Web servers are used by the end users to access the application • Application layer – used to access the database layer and provide separation between the database and users. Also contains logic and access control for application • Database layer – contains data needed by application

  12. Server Farm Design

  13. Server Farm Design • There are generally two accepted methods in the design • Bridging – the lower interfaces of the upper layer are connected to the same VLAN as the upper interfaces of the layer beneath them • Routing – routers are placed between the layers

  14. Bridged Three-Tier Design

  15. Bridged Three-Tier Design • The advantages of this design are simplicity and speed • Disadvantages are decreased security • This has changed with the advances in security devices (layer-2 firewalls)

  16. Routed Three-Tier Design

  17. Routed Three-Tier Design • The advantages of this design are increased security • Disadvantages increases complexity and adds processing (which means latency)

  18. Server Farm Design • Is there any other issue that may need addressed in the design????

  19. Server Farm Design

  20. Server Farm Design • Can not easily manage the server remotely

  21. Server Farm Design • Can not easily manage the server remotely

  22. Server Farm Design • Every interface will need an IP address. • In some server high-availability solutions, you’ll need a third IP address for each VLAN. For example, IP multipathing requires a virtual IP address on each VLAN in addition to one for each physical interface. • Every IP address you assign may need a DNS entry (including virtual IP addresses). • Which interface is primary? • Does the server need a default gateway? If so, where does it go? Can the server support multiple defaults? How will this work? Web servers need a default gateway that points to the Internet. This will require your management VLAN to have specific routes on the servers. • How many physical network cards do you need in a server to support six Ethernet interfaces? Make sure you have enough. Extra interfaces are even better. • Will the servers have both interfaces active in each VLAN, or just one? Some server high-availability solutions require the switches to be configured a certain way, while others require different configurations. Work this out in a lab before you build your network. • Will your servers support remote Ethernet consoles? Will you need a dedicated network for this traffic?

  23. Server Farm Design

  24. Modern Virtual Server Environments • With Virtual environment your access-layer switches are also virtualized • This will make the server network requirements more like a access-layer switch uplink • Multiple 10 Gb ports are common

More Related