复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wide Area Networks(WANs)

Wide area networks (WANS) Chapte Updated January 2009 XU Zhengchuan Fudan University
Wide Area Networks (WANs) Chapter 7 Updated January 2009 XU Zhengchuan Fudan University

Orientation Single Networks Layers 1 and 2(so osI standards dominate) Chapters 4-7: Local to long-distance for single networks Chapter 4: Wired Ethernet LANS Chapter 5: Wireless LANS WLANs) Chapter 6: Telecommunications(and Internet Access Chapter 7: Wide Area Networks (WANs) Chapter 8: TCP/IP Internetworking To link multiple single networks 7-2
7-2 Orientation • Single Networks – Layers 1 and 2 (so OSI standards dominate) – Chapters 4-7: Local to long-distance for single networks • Chapter 4: Wired Ethernet LANs • Chapter 5: Wireless LANs (WLANs) • Chapter 6: Telecommunications (and Internet Access) • Chapter 7: Wide Area Networks (WANs) • Chapter 8: TCP/IP Internetworking – To link multiple single networks

WAN Essentials
WAN Essentials

Figure 7-1: Wide Area Networks WANS) Wide Area Networks(WANs) Single networks that connect different sites So Layer 1 and Layer 2 operation WAN Purposes Internet access( Chapter 6) Link sites within the same corporation Provide remote access to individuals who are off site 7-4
7-4 Figure 7-1: Wide Area Networks (WANs) • Wide Area Networks (WANs) – Single networks that connect different sites – So Layer 1 and Layer 2 operation • WAN Purposes – Internet access (Chapter 6) – Link sites within the same corporation – Provide remote access to individuals who are off site

Figure 7-1: Wide Area Networks WANS) WANs are characterized by high cost and low Speeds High cost per bit transmitted compared to LaNs Consequently, lower speeds(most commonly 128 kbps to a few megabits per second) This speed usually is aggregate throughput shared by many users Much slower than LAN speeds (100 Mbps to 1 Gbps to the desktop 7-5
7-5 Figure 7-1: Wide Area Networks (WANs) • WANs are Characterized by High Cost and Low Speeds – High cost per bit transmitted compared to LANs – Consequently, lower speeds (most commonly 128 kbps to a few megabits per second) • This speed usually is aggregate throughput shared by many users – Much slower than LAN speeds (100 Mbps to 1 Gbps to the desktop)

Figure 7-1: Wide Area Networks WANS) Carriers Beyond their physical premises, companies must use the services of regulated carriers for transmission Companies do not have rights of way to lay wires beyond their premises Customers are limited to whatever services the carriers provide Prices for carrier services change abruptly and without technological reasons Prices and service availability vary widely from country to country 7-6
7-6 Figure 7-1: Wide Area Networks (WANs) • Carriers – Beyond their physical premises, companies must use the services of regulated carriers for transmission • Companies do not have rights of way to lay wires beyond their premises – Customers are limited to whatever services the carriers provide – Prices for carrier services change abruptly and without technological reasons – Prices and service availability vary widely from country to country

Page 313 Test Your understanding
7-7 • Page 313 • Test Your understanding • 1

Leased Line Networks
Leased Line Networks

Leased Lines: Recap Leased line characteristics Point-to-point circuits Always on High speeds: 64 kbps (rare) to several gigabits per second Leased for a minimum period of time Usually offered by telephone companies 7-9
7-9 Leased Lines: Recap • Leased Line Characteristics – Point-to-point circuits – Always on – High speeds: 64 kbps (rare) to several gigabits per second – Leased for a minimum period of time – Usually offered by telephone companies

Figure 7-2: Leased Line Networks for Voice and Data eased Line voice Network Site A Site B OC3 Leased Line PBⅩ PBX Leased T1 Line Leased Leased line voice Networks Have a 56 kbps Site C Leased PBX at each Site Line 56 kbps PBX Leased Ine Leased 56 kbps Line PBX PBX Leased Line Site D Site e 7-10
7-10 Figure 7-2: Leased Line Networks for Voice and Data OC3 Leased Line T1 Leased Line T1 Leased Line T3 Leased Line 56 kbps Leased Line 56 kbps Leased Line 56 kbps Leased Line Site A Site B Site D Site E Site C Leased Line Voice Network PBX PBX PBX PBX PBX Leased Line Voice Networks Have a PBX at Each Site
按次数下载不扣除下载券;
注册用户24小时内重复下载只扣除一次;
顺序:VIP每日次数-->可用次数-->下载券;
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wide Area Networks(WANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wide Area Networks(WANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Telecommunications.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Telecommunications.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Telecommunications.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wireless LANs(WLANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wireless LANs(WLANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wireless LANs(WLANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Token-Ring Networks.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Ethernet LANs.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Ethernet LANs.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Physical Layer Propagation:UTP and Optical Fiber.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Physical Layer Propagation:UTP and Optical Fiber.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Hands On:Cutting and Connectorizing UTP.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Network Standards Layered Architectures.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Network Standards Layered Architectures.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)An Introduction to Networking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)An Introduction to Networking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Hands On:Configuring Windows XP Home for Networking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Case Study:Pat Lee’s Home PC Network.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)TCP/IP Internetworking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)TCP/IP Internetworking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)TCP/IP Internetworking.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Security.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Network Management.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Networked Applications.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Topics Covered(胥正川).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Ethernet LANs.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)Wide Area Networks(WANs).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)移动电话通信原理(补充资料).ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)无线局域网补充删节版本.ppt
- 复旦大学:《计算机网络 Computer Networking》课程教学资源(PPT课件讲稿)移动商务介绍(概念及其特点、移动商务与电子商务、价值链及商业模式).ppt
- 复旦大学:《数据结构与算法设计》考试样卷_2009-2010年度A卷(试卷).pdf
- 复旦大学:《数据结构与算法设计》考试样卷_2009-2010年度A卷(答案).pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 1. Stack.pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 2. Divide and Conquer.pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 3. Hash Tables.pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 4. Binary Search Trees.pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 5. Red-Black Tree.pdf
- 复旦大学:《数据结构与算法设计》实验设计_Lab 6. Greedy Algorithms.pdf