Lesson 4 in VB.NET

Drawing Data Matrix in VB.NET Lesson 4

Lesson 4
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Troubleshooting Internet Connectivity
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NAT routers and proxy servers have network interfaces just like client computers, and they must have correct TCP/IP client configuration parameters. The NAT configuration and proxy server functions must also be correct. If no other components are at fault, the Internet access router or the WAN connec tion to the ISP might be the cause of the Internet connection problem. A service provider s equipment, or even the Internet itself might also cause a problem with the Internet connection.
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Case Scenario Exercise
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You are the network infrastructure design specialist for Litware Inc., a manufacturer of specialized scientific software products. You have already created a network design for their new office building, as described in the Case Scenario Exercise in 1. The office building is a three-story brick structure built in the late 1940s, which has since been retrofitted with several types of network cabling by various tenants. In your orig inal design, each building floor has a separate Ethernet LAN, as follows:
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First floor Ten individual offices, each with a single computer using 100Base-TX Fast Ethernet. Second Floor Ethernet. Fifty-five cubicles, each with a single computer using 10Base-T
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Third Floor A laboratory setting with network connections for up to 100 computers using 100Base-FX Fast Ethernet.
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The three LANs are all connected to a backbone network, running 1000Base-T Gigabit Ethernet and using dedicated computers running Windows Server 2003 as routers. You are authorized by the home office to install an Internet connection for the entire network, and you are designing an Internet access strategy. The network users have varying needs. The inside sales department numbers 55 people, who need access to Internet e-mail only. The company also has 20 outside salespeople based in this office, all of whom are equipped with laptop computers that they use to access the company network through VPN connections. The salespeople dial into a national ISP account from wherever they happen to be and open a secure connection through the Internet to a remote access server located in the building. The salespeople use the remote network connection to access the company database, download product updates from company servers, and check their e-mail on the company mail server. The research and development lab on the third floor houses approximately 50 scien tists and technicians, but they have special needs. In addition to e-mail and Web access for all workers, these people must frequently upload and download large files to and from Internet servers as well as access real-time video streams from other locations over the Internet.
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3
Planning Internet Connectivity
All users in the building work a single shift, from 9 A.M. to 5 P.M., weekdays only. All client computers are shut down during nonworking hours. However, in addition to these users, the building also houses the company s six Internet Web servers, which receive heavy traffic and must remain connected to the Internet at all times. Based on this information, answer the following questions about the Internet access strategy for this 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 b. ADSL c. T-1 d. Frame relay 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. b. Prevent the inside sales personnel from running any Internet application other than an e-mail client. c. Authenticate users before granting them Internet access and limiting Internet access to certain hours of the day.
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