原创力文档Discovery_Routing_Switching_Chapter_1_EN（思科网络技术学院CCNA4.0 官方资料-CCNA Discovery- CAC建议版Discovery_ 英文版-D3_Routing_Switching__EN）.ppt
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Discovery_Routing_Switching_Chapter_1_EN（思科网络技术学院CCNA4.0 官方资料-CCNA Discovery- CAC建议版Discovery_ 英文版-D3_Routing_Switching__EN）
* * When determining how to design the network it is important to consider the amount of traffic destined for a specific location and where that traffic most often originates. Controlling the flow of traffic on a network optimizes bandwidth and introduces a level of security through monitoring. By understanding traffic patterns and flows, the network administrator can predict the types and amount of traffic to expect. When traffic is detected in an area of the network where it is unexpected, that traffic can be filtered and the source of the traffic investigated. * * * * * * * * * * * * * VPNs are often described as tunnels. Consider the analogy of an underground tunnel versus an open road way between two points. Anything that uses the underground tunnel to travel between the two points is surrounded and protected from view. The underground tunnel represents the VPN encapsulation and virtual tunnel. * All data flow between the source and destination is encrypted and encapsulated using a secure protocol. When using a VPN, a virtual tunnel is created by linking the source and destination addresses. This secure packet is transmitted across the network. When it arrives at the receiving end, it is de-encapsulated and unencrypted. VPNs are a client/server application; therefore, telecommuters must install the VPN client on their computers in order to form a secure connection with the enterprise network. When telecommuters are connected to the enterprise network through a VPN, they become part of that network and have access to all services and resources that they would have if they were physically attached to the LAN. * * * No graphic needed * 1.2.3 Network Traffic Prioritization Traffic being prioritized 1.2.3 Network Traffic Prioritization Traffic being prioritized 1.2.3 Network Traffic Prioritization Traffic being prioritized 1.3 Supporting Remote Workers 1.3.1 Teleworking Teleworking, also referred to as telecommuting and e-commuting, allows employees to use tel
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