c# zxing qr code generator Lesson 3 Review in Visual C#

Painting QR Code in Visual C# Lesson 3 Review

Lesson 3 Review
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1. Several employees from your company who work out of their homes have asked you if it would be possible to have multiple computers share the DSL connections they are using for Internet connectivity. What concerns or issues would you need to address before implementing a NAT solution
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First, make sure the applications that must run on the clients computers are supported by NAT. Also, the NAT server must have two network interface cards that are properly configured: one connected to the internal private network and the other connected to the DSL line.
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2. You are configuring a client workstation using a private IP address to connect to the Internet. You decide that NAT would be a good solution and are now sitting in front of the user s workstation. Each of the workstations in the subnet uses a static IP address. How would you configure this workstation to connect to a NAT server located on the subnet
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Questions and Answers
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If the workstation is already configured with an internal private IP address and subnet mask, you can most likely leave these fields as they are. However, you must change or add the IP address of the NAT server in the default gateway parameter. All NAT client workstations must have the IP address of the NAT server as their default gateway IP address. The NAT server will translate the private IP address of the client s workstation to the company s public IP address, create a unique port number, and forward the packet over the Internet.
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3. After implementing NAT at your organization, a client calls and says she is not able to connect to the Internet but she is still able to run a database application that is located on a NetWare 4.11 server. What could be causing this problem
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NAT requires that the client workstation be configured with TCP/IP Since the client can still con . nect to the NetWare server, it is possible that the NetWare server is running Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX) protocol, which does not use TCP/IP . To resolve the problem, configure the client s computer with TCP/IP .
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Lesson 4 Practice
1. The Glasgow office maintains separate domain names and public IP addresses for each of its departments. They are considering implementing NAT. What are their options for securing their NAT solution
Creating Inbound filters would let NAT servers allow connections only for certain IP addresses, a good way of making sure that only valid users can connect to the system. Creating outbound filters would let administrators govern the traffic outbound to the Internet and block particular types of traffic. You should also take measures to secure the private services offered on a network from users outside the network who do not need access to them. For example, you might want to let remote users connect to your intranet web server but not to other file servers.
2. The Paris office has just upgraded its servers to Windows Server 2003, its messag ing system to Exchange Server 2000, and many of its clients to the mail client Outlook 2003. Outlook 2003 has the ability to connect to an Exchange mail server over RPC. The company needs remote users to be able to use this functionality. Would NAT be capable of performing the address translation for this service Why or why not
No, NAT wouldn t be able to perform the address translation. NAT is unable to perform transla tion for RPC, SNMP LDAP COM, DCOM, or Kerberos v5. Exchange 2003 includes the Windows , , Server 2003 RPC Proxy Service, which allows RPC to work across NAT.
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