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Presentation_ID 10 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Components of a Network Topology Diagrams Ethernet switch 以太网卡
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Presentation_ID 11 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential LANs, WANs, and Internets The Internet
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Presentation_ID 12 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Connecting to the Internet Connecting Remote Users to the Internet Cellular 细胞的?? Satellite 人造卫星 Dial-Up 拨号
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Presentation_ID 13 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Connecting to the Internet Connecting Businesses to the Internet Dedicated leased 专用租用线路 Metro Ethernet 地下以太网 DSL=Digital Subscriber Line 数字用 户专线
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Presentation_ID 14 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Supporting Network Architecture As networks evolve 发展 , we are discovering that there are four basic characteristics that the underlying 潜在 architectures need to address in order to meet user expectations 预期 : Fault Tolerance (容错) Scalability (可测量) Quality of Service (QoS) 服务质量 Security 安全
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Presentation_ID 15 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Fault Tolerance in Circuit Switched Network Circuit 电路 Dedicated 专注 Denied 拒绝
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Presentation_ID 16 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Packet-Switched Networks Packet 信息包 Route 发送 Destination 目的地 Reassembled 重新组装 Sequence 顺序 Transmission 发射
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Presentation_ID 17 © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential Reliable Network Providing Network Security Competitor 竞争者 Encryption 加密技术 Fraudster 行骗者 Access policy 访问策略
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