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Dựa trên thông tin trong trường hợp kịch bản Tập, trả lời các thắc mắc tions sau đây về chiến lược truy cập Internet cho việc xây dựng Litware, Inc. 1. Đối với mỗi giải pháp truy cập Internet sau, xác định lý do tại sao nó sẽ hoặc sẽ không được thích hợp cho việc cài đặt này. a. ISDN Basic Rate Interface | 3-46 Chapter 3 Planning Internet Connectivity Page Case Scenario Exercise 3-39 Based on the information in the Case Scenario Exercise answer the following questions about the Internet access strategy for the Litware Inc. building. 1. For each of the following Internet access solutions specify why it would or would not be suitable for this installation. a. ISDN Basic Rate Interface At 128 Kbps the ISDN BRI service would not provide sufficient bandwidth for the building s users. b. ADSL ADSL is an asymmetrical service that provides relatively little upstream bandwidth which would be insufficient for the Internet Web servers in the building. c. T-1 A T-1 leased line would be a suitable connection for this building because it provides sufficient bandwidth both upstream and downstream and operates around the clock. d. Frame relay Frame relay would be an excellent Internet access solution for this building because it enables the company to pay only for the bandwidth it uses and because it also supports bursts of bandwidth in excess of the contracted transfer rate. 2. All computers on the building s three client LANs use unregistered IP addresses and the router connecting the backbone network to the Internet WAN link has NAT port forwarding and packet filtering capabilities. Explain how you would have to modify the Internet access strategy to support each of the following capabilities. a. Enable the scientists on the third floor to temporarily activate a server that streams video live over the Internet. To enable a server behind a NAT router to have a presence on the Internet you must use port forwarding to associate the server s unregistered IP address with a specific registered address and port. b. Prevent the inside sales personnel from running any Internet application other than an e-mail client. To limit the inside sales users to e-mail access only you can create IP address and port filters on the NAT router that block all Internet traffic from the IP addresses of .
