c# zxing qr code generator Case Scenario Exercise in Visual C#.NET

Generation QR Code in Visual C#.NET Case Scenario Exercise

Case Scenario Exercise
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Review the following scenario and complete the questions.
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Scenario
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QR-Code Creator In .NET Framework
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You have been selected to design an IP addressing scheme for a large marketing research company that has just landed a $15 million contract with one of the largest cellular telephone companies in the United States. The company has just purchased all new computer systems; all client systems are running Windows XP Professional, and all servers are running Windows Server 2003.
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Background
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Encoding Bar Code In Visual C#
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Trey Research has offices in Chicago, Miami, and New York. The company touts the largest data warehouse storage servers, which have information on the spending and buying habits of more than 200 million people throughout the world.
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Network Infrastructure
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Jack Moran, the IT manager from Trey Research, has given you a basic sketch of the com pany s network. (See the diagram that follows.) All of the offices need to communicate with each other over the company s private network. The New York office, however,
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Lesson 4
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Creating a DHCP Strategy
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8-35
hosts several Web servers and three Microsoft Exchange 2003 Servers. The IT manager wants users to be able to access these servers from the Internet, but indicates that he is a little concerned about the security ramifications of doing such a thing.
Internet
Router
Jack claims that he read an article in a computer journal that said more than two hun dred workstations on any one subnet created excessive collision and broadcast traffic. He wants the IP addressing scheme that you design to disallow any more than 300 nodes for each subnet.
Future Plans
The company will be considering purchasing property in Los Angeles, where it plans on opening several offices within a year or so. More than 3,000 workstations will be needed for this location.
Questions
Given the previous scenario, answer the following questions. 1. What private IP address class would you use for this network infrastructure How many subnets would be required in the Chicago offices
2. How could you design this network so that external users could access the Web server while minimizing the risk of an attack on your company s internal network
8-36
8
Designing a Network and Routing Infrastructure
3. If a perimeter network were created for the scenario described above, what network components could you use to protect both the perimeter network and the company s internal network
Summary
TCP/IP is the required protocol for Windows Server 2003. An important part of TCP/IP that must be understood is IP addressing. You need to configure all of your client workstations, printers, servers, and so forth, with unique IP addresses. IP addresses are made up of four bytes, called octets, which represent both a network address and a host address. Depending on the decimal value of the first byte, you can determine the TCP/IP address class from which the IP address is a member. Class A addresses allow for the most host addresses, whereas Class C addresses allow for the most subnets. Classes A, B, and C have default subnet masks of 255.0.0.0, 255.255.0.0, and 255.255.255.0, respectively. The subnet mask is used to determine the network ID portion of an IP address. Borrowing bits from the host portion of an IP address to create additional subnets is called subnetting. You determine the number of bits you need to borrow based on the number of subnets you need to create and the number of available host addresses you will need in each of the subnets. A perimeter network is a small network that is accessible to external users, but does not allow users to access the internal network of a company. Perimeter networks usually contain Web servers and mail servers for external users to access. Packet filtering, stateful inspection, and application-layer firewalls may be used to protect your company s internal network from external users. Documentation of your perimeter network should include the login names and passwords for all of the servers and routers, or any systems that require a login name. This information should be placed in a locked safe or location that requires a key or combination. It should also include all of the network components that are used to protect the company s internal network, such as firewalls, proxies, and IDSs. Because the perimeter network is never on the same subnet as the company s internal network, document all IP addresses used on all interfaces and devices, as well as subnet masks and subnet ranges used on the perimeter network. DHCP is a service that runs on a Windows Server 2003 operating system. A DHCP server is any server that runs this DHCP service. DHCP allocates IP
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