Exam Highlights in VB.NET

Drawer Data Matrix in VB.NET Exam Highlights

Exam Highlights
Data Matrix Creation In VB.NET
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Recognize Data Matrix ECC200 In Visual Basic .NET
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Before taking the exam, review the key topics and terms that are presented below to help you identify topics you need to review. Return to the lessons for additional prac tice, and review the Further Reading sections in Part 2 for pointers to more informa tion about topics covering the exam objectives.
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Barcode Reader In Visual Basic .NET
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2
DataMatrix Creation In Visual C#
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Making Data Matrix ECC200 In Visual Studio .NET
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Planning a TCP/IP Network Infrastructure
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DataMatrix Drawer In VB.NET
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2-55
Linear Barcode Creator In VB.NET
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Encoding Barcode In VB.NET
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Key Points
Creating USS Code 128 In VB.NET
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Every computer on a TCP/IP network must have a unique IP address. Computers visible to the Internet must have registered addresses. Computers accessing the Internet through NAT routers or proxy servers can use unregistered addresses. Routers are network layer devices that connect networks into an internetwork while keeping their collision domains and broadcast domains separate. Switches are data-link layer devices that connect networks into one large network. Although switching all but eliminates collisions from an Ethernet installation, the network still consists of one large broadcast domain. To subnet a network, you borrow some bits from the host identifier and use them to create a subnet identifier. You can then split a network address into separate subnets, each of which is a separate entity on a TCP/IP network. Most TCP/IP communications problems are the result of incorrect configuration settings on the TCP/IP client. The problems can result from typographical errors during a manual client configuration or from incorrect configuration of a DHCP server or relay agent.
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Key Terms
Code 128 Code Set A Generation In None
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Network address translation (NAT) A router function that enables client comput ers on a private network with unregistered IP addresses to access Internet resources without exposing themselves to possible intrusion from the Internet. Proxy server An application layer software component that relays transmissions between unregistered client computers on a private network and the Internet. Proxy servers can also regulate client access to specific Internet resources and cache Internet information for rapid access by other clients. Collision domain A group of computers connected so that any two systems trans mitting packets at the same time will cause a collision. Computers connected to a shared Ethernet hub, for example, are said to be in the same collision domain. Connecting two LANs with a router creates an internetwork with two separate col lision domains. Broadcast domain A group of computers connected so that a broadcast message transmitted by any system will reach all other connected computers. Computers connected by hubs or switches form a single broadcast domain. Connecting two LANs with a router creates an internetwork with two separate broadcast domains.
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Decode QR-Code In C#.NET
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2-56
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2
Planning a TCP/IP Network Infrastructure
Questions and Answers
Page 2-12
Lesson 1 Practice
For each of the following types of computers, specify whether it should have a regis tered or an unregistered IP address, or both, and why. 1. A corporate Web server providing product information to Internet clients around the world
Registered, because for clients on the Internet to send requests to the server, the server must have a registered IP address
2. A NAT router enabling clients on a private network to access Internet servers
Both, because the NAT router must be connected to the private network to communicate with the clients, and it must connect to the Internet so that it can communicate with the Web servers
3. An intranet Web server on a private network used to provide human resources information to employees
Unregistered, because although the computer is a Web server, the clients are also located on the private network and the server does not have to be visible to the Internet
4. A client computer that accesses Web servers on the Internet using a NAT router
Unregistered, because the NAT router is responsible for communicating with the Internet serv ers requested by the client
5. A proxy server providing Internet Web access to clients on a private network
Registered, because the proxy server is responsible for sending the clients requests to the Web servers on the Internet
Page 2-12
Lesson 1 Review
1. Which of the following statements about NAT routers and proxy servers are true Choose all answers that are correct. a. NAT routers and proxy servers must have two IP addresses. b. A NAT router can provide Internet access to any client application on the pri vate network. c. Proxy servers can cache information they receive from Internet servers. d. The Windows Server 2003 operating system includes a proxy server.
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