清华工家简报901129-桃园区网.ppt

大綱說明 OSI 網路模型 區域網路基礎 廣域網路基礎 Content Networking 影片欣賞 OSI 七層網路模型 實體層 集線器層 1 交換機層 2 交換機層 2 路由器層 3 對等層通信 數據封裝 TCP/IP 通訊協定 參考網址 WWW.PROTOCOLS.COM 區域網路元素 傳統的區域網路--基於集線器的區域網路 共享資源 桌面連接 在共享網段內安全性較差 路由器提供擴展能力 增減,變化會引起衝突 根據實體位置劃分的用戶群組 網路擁塞的主要原因 網路重要應用如:彩色出版業務, CAD/CAM, 影像處理, 和相關的資料庫 網段上用戶太多 多用戶存取1或2個伺服器 高性能的 PC 網路連結 Client Server Then—Intranet NowThe Changing Model Emerging Applications 可選技術: 高性能乙太網路 交換機工作原理： 學習 交換機工作原理：轉發 交換機工作原理：過濾 第2層交換的優點 網路傳輸型式 共享式區域網路的限制 子網被連至集線器 用戶根據位置分群組 網段上沒有安全性 尋址受限制 機器移動需要位址改變 路由器連接埠價格非常昂貴 Why Use VLANs? Reduced administrative costs Simplify moves, adds, and changes Efficient bandwidth utilization Better control of broadcasts Improved network security Separate VLAN group for high-security users Relocate servers into secured locations Scalability and performance Microsegment with scalability Distribute traffic load Provide greater segmentation and organizational flexibility What is a VLAN? A virtual LAN (VLAN) is a switched network that is logically segmented by functions, project teams, or applications regardless of the physical location of users. It: Provides greater segmentation and organizational flexibility Can group switch ports and users assigned to them into communities of interest by department, team, or application Requires routers to provide communication between VLANs What are the Components of VLANs? Switches Membership determination Trunking between high-speed switches Common VLAN exchange Multiprotocol routing Inter-VLAN exchange Servers Multi-VLAN communication Management Security, control, administration, which simplifies moves and changes Establishing VLAN Membership Port driven MAC address driven Network address driven Application type driven What Requirements are Generated by the Use of VLANs? Maintain network performance High speed trunking VLAN packet transmission without impacting switching performance or requiring the use of complex filtering tables Manageable broadcast domains that span the campus Bandwid