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SPU Information Science Institute of Sripatum University Sripatum University 1 IS516 Computer Communication and Networks การสื่อสารคอมพิวเตอร์และเครือข่าย.

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งานนำเสนอเรื่อง: "SPU Information Science Institute of Sripatum University Sripatum University 1 IS516 Computer Communication and Networks การสื่อสารคอมพิวเตอร์และเครือข่าย."— ใบสำเนางานนำเสนอ:

1 SPU Information Science Institute of Sripatum University Sripatum University 1 IS516 Computer Communication and Networks การสื่อสารคอมพิวเตอร์และเครือข่าย Asst.Dr.Surasak Mungsing

2 2 Network Design Lecture 07 Network Design

3 SPU Information Science Institute of Sripatum University 3 Design Activities The design activity is truly an in-depth process, which includes: collection of requirement and user expectations determine type of current and future data traffic based on growth rate of data and additional servers determine all layer 1, 2 and 3 network devices to be used in the network system Create documents for both physical and logical design

4 SPU Information Science Institute of Sripatum University 4 LAN Design Goals  Functionality – network must work at reasonable speed and reliability  Scalability – network must be scalable without sig รดรฟะ change of overall design  Adaptability – network design must take consideration of future technology and must not use components or devices not support by future technology when the time comes  Manageability – design must support network monitoring and management

5 SPU Information Science Institute of Sripatum University 5 Design Methodology  Analyze requirements  Develop LAN structure (topology)  Set up addressing (and naming conventions) and routing

6 SPU Information Science Institute of Sripatum University 6 Analyze Network and User Requirements  Business issues  Technology issues  Administrative issues  Gather Data (corporate structure, business information flow, application in use, current topology, etc.)  Business requirements  Technical requirements  Applications or business operations  Availability requirements (throughput, response time, access to resource)

7 SPU Information Science Institute of Sripatum University 7 Analyze Network Load Requirements Client/Server Host/terminal Routing protocols backup worst-case traffic load

8 SPU Information Science Institute of Sripatum University 8 Develop LAN Topology Use LAN topology that fulfils requirements Topology Star Topology Extended Star Topology

9 SPU Information Science Institute of Sripatum University 9 Ethernet Technology Segmentation Bridge and switch use for segmentation Make more collision domains Is still single broadcast domain Collision domain (bandwidth domain) Repeaters and hubs broadcast collisions but not for switches, bridges androuters Broadcast domain Group of devices will receive frames from a device in the group Broadcast domains scope are limited by routers because they do rebroadcast frames

10 SPU Information Science Institute of Sripatum University 10 Network Design Three types of topology design according to OSI model  Layer 1 - Physical Layer Related to type of transmission lines such as CAT5 UTP and fiber- optic cable and also EIA/TIA 568 standard for line connection  Layer 2 - Data Link Layer Related to selection of layer-2 devices, e.g. bridges or LAN switches for connecting layer-1 devices to LAN segment. Layer-2 layer devices define collision and broadcast domains.  Layer 3 - Network Layer Related to selection of layer-3 devices, e.g. routers that create unique LAN segments and communicate using layer 3 address such IP address

11 SPU Information Science Institute of Sripatum University 11 Design Goals Physical Layer Creates communication layer focus on speed and performmance Data Link Layer  Build MDFs or IDFs such that end hosts are group in Layer 1 to create physical LAN segment  Install LAN switches using microsegmentation to reduce size of collision domain  Build signal distribution point in network topology so that users are group (at Layer 2) as virtual workgroups (VLANs) and unique broadcast domains. Network Layer Create communication path among LAN segments to filter flow of data packets Separate ARP protocol separate collisions among segments. Filter layer-4 services among segments

12 SPU Information Science Institute of Sripatum University 12 Cable Types and Wiring Configurations Copper Coaxial Twisted pair Fiber-optic Multimode Single-mode Wiring configurations Star/Extended Star Distance limitations

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16 SPU Information Science Institute of Sripatum University 16 Extended Star Topology Define standard according to EIA/TIA Build groups of network and connect them with vertical cabling (Catchment areas ) All vertical cabling connect to MDF to build a single LAN segment Vertical cabling - (Backbone cabling) transmission line that connects wiring closets and POP, and POP of other buildings that are parts of the same LAN Catchment areas – areas that are serviced by networking device such as hubs IDF - Intermediate Distribution Facility. Secondary network distribution room in a building for star network topology, a dependence of MDF.

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18 SPU Information Science Institute of Sripatum University 18 Layer 2 - LAN Switching Objective of Layer 2 (Data Link Layer) is to control data flow and correct errors in network. The devices are NIC, Bridges and LAN switches LAN switches (Layer 2 Switch) are capable to allocate bandwidth to a port, therefore it can assign very high bandwidth to vertical cabling, uplinks and servers The theoretical maximum bandwidth for a Layer 2 Switch = (No-of-ports * Bandwidth)/2

19 SPU Information Science Institute of Sripatum University 19 MDF-Main Distribution Facility MDF - Main Distribution Facility. A main distribution room in a building for star topology, which contains patch panels, hub, and router In a simple star topology, there is only one main distribution facility (MDF) that includes horizontal cross connect (HCC) patch panels. HCC patch cables used to connect Layer 1 'horizontal cabling' (Layer 1) to LAN switch ports (Layer 2) uplink port of LAN switch connects to Ethernet port of router (Layer 3 ) using‘ patch cable'. At this point, end host connects to router port Quality of horizontal cable and number of ports of HCC patch panels will be defined by user requirements

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23 SPU Information Science Institute of Sripatum University 23 Use Switches to reduce congestion Use microsegmentation to limit collision domains Cascade switches and hubs Reassign use of resources to appropriate needs

24 SPU Information Science Institute of Sripatum University 24 Microsegmentation Divide network into small segments to improve overall bandwidth of network Installation of LAN switching at MDF and IDFs affects size of collision domains and data speed in each of horizontal cable and vertical cable. Vertical cable must handle all data traffic between MDF and IDFs therefore requires higher capacity

25 SPU Information Science Institute of Sripatum University 25 Collision Domains In the operational environment of only switch in network, size of collision domain is just the two hosts, when a hub is used the size of collision domain increases and bandwidth will be shared Shared LAN hub is multiport repeater, therefore is collision domain. All hosts connected to shared LAN hub will share collision domain and the bandwidth

26 SPU Information Science Institute of Sripatum University 26 Layer 3 - Routing Using Layer-3 devices such as routers can create segmentation of LAN as unique networks for both physical and logical. Routers can be used to connect wide area networks (WANS) e.g. Internet Routers serve as broadcast firewalls Routers consolidate for scalable internetworks Network protocol addressing and routing provides built-in scaling

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30 SPU Information Science Institute of Sripatum University 30 Documenting Your Network Physical Network Maps (cutsheet) Logical Network Map (IP addressing scheme) Addressing Maps (snapshot view of network)

31 SPU Information Science Institute of Sripatum University 31 Reasons to Document Reducing a lot of time for problem solving Least document networks have the most problems Good documenting helps reduce amount of problems very much The more documents the better network (maintenance)

32 SPU Information Science Institute of Sripatum University 32 Summary of network design Gathering network requirements and using information Bandwidth requirements analysis Define all layer-1, -2, and -3 networking devices (e.g. cable, hub, bridge, switch, router) and network topology Documenting design such as table of equipments Draw cable diagram and location of distribution box Draw connection diagram of networking devices in network

33 SPU Information Science Institute of Sripatum University Exercise 33 บริษัท ABC เป็นบริษัทที่ตั้งขึ้นใหม่ มีสำนักงานใหญ่และฝ่ายขายตั้งอยู่ใน เมืองใหญ่ซึ่งมีโครงสร้างพื้นฐาน (Infrastructure) ด้านการติดต่อสื่อสาร เพรียบพร้อม บริษัทฯได้ลงทุนสร้างโรงงานผลิตในเขตชนบทเพื่อให้ได้สิทธพิเศษด้านการ ลงทุนและภาษี แต่ที่ตั้งโรงงานเป็นท้องถิ่นที่ขาดแคลนระบบโทรศัพท์พื้นฐาน และการติดต่อสื่อสารทางสาย การดำเนินการของธุรกิจจะต้องมีการค้นหาข้อมูลเพื่อการจัดซื้อซื้อวัตถุดิบ จากต่างประเทศมาป้อนให้กับโรงงานผลิตอย่างสม่ำเสมอและการหาตลาด ต่างประเทศ เพื่อการจำหน่ายสินค้า บริษัทฯมีนโยบายให้โรงงานผลิตส่ง รายงานการผลิตด้วยเอกสารอิเลกทรอนิกส์ทุกวัน จงออกแบบระบบเครือข่ายคอมพิวเตอร์เพื่อรองรับการดำเนินธุรกิจของบริษัท ABC โดยพิจารณาให้ครอบคลุมถึงการใช้งานภายในสำนักงาน การ ติดต่อสื่อสารระหว่างหน่วยงานของบริษัทฯที่อยู่ห่างไกลกันตลอดจนการ ติดต่อสื่อสารกับต่างประเทศ ในการออกแบบ ให้อธิบายเหตุผลและวาด ภาพประกอบการออกแบบและตั้งสมมติฐานได้คามที่เห็นสมควร

34 SPU Information Science Institute of Sripatum University 34 Next Lecture: Network Performance


ดาวน์โหลด ppt SPU Information Science Institute of Sripatum University Sripatum University 1 IS516 Computer Communication and Networks การสื่อสารคอมพิวเตอร์และเครือข่าย.

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