Supporting Network Connectivity in VB.NET

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Supporting Network Connectivity
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Windows Firewall is a software-based firewall that is included in Windows XP Ser vice Pack 2. You can enable or disable Windows Firewall for any network connec tion, and configure what types of traffic it allows to enter or leave the computer. Internet Control Message Protocol allows routers and host computers to swap basic control information when data is sent from one computer to another. ICMP tools such as Ping and Tracert are often used to troubleshoot network connectivity. Most of the problems you will encounter with Windows Firewall will involve users not being able to enable Windows Firewall for a particular connection, and users having connectivity problems because Windows Firewall is turned on and block ing necessary traffic. Remote Assistance enables users to request support from a more advanced user or from computer support personnel. With Remote Assistance, the user providing support can connect to the troubled user s desktop, view what is happening remotely, and take control of the system to resolve a problem if necessary. Remote Desktop enables users to remotely access their computers across the network and use the desktop as if they were sitting in front of the computer.
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Before taking the exam, review the key topics and terms that are presented in this chapter. You need to know this information.
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If you are troubleshooting a network problem and discover that a client computer has an IP address on the 169.254.0.0 network, the computer has assigned itself that address using APIPA because the computer was unable to locate a DHCP server. For the exam, make sure that you understand how to enable automatic configura tion of DNS servers and where you will go to specify particular DNS servers. You should know where Windows Firewall log files are stored, whether logging is available, and what kind of information you can learn from log files.
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Automatic Private IP Addressing (APIPA) A method of automatically assigning an IP address to a computer when either no address is assigned or no DHCP server is available. default gateway The router to which the TCP/IP client will forward packets destined for computers on other networks.
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10-65
Domain Name System (DNS) tion for TCP/IP clients.
A network service designed to perform name resolu
Dynamic Host Configuration Protocol (DHCP) A service that automatically han dles requests for TCP/IP configuration information to client systems. IP address A number that uniquely identifies a device on a TCP/IP network.
Ipconfig A command-line utility that can be used to view TCP/IP configuration infor mation. loopback address An address that is used for testing TCP/IP configuration and that cannot be assigned to individual devices on a TCP/IP network. Normally it is 127.0.0.1. NetBIOS name A 16-character name assigned to a computer that is used by NetBIOS applications when establishing connections. Pathping.exe A command-line utility that is used to trace routes across a series of networks, combining the features of Ping and Tracert. Ping A command-line utility for testing basic TCP/IP communications.
Remote Assistance A service that enables users to request support from a more advanced user or from computer support personnel. Remote Desktop A process that enables users to remotely access their computers across the network and use the desktop as if they were sitting in front of the com puter. subnet mask A method of separating the network portion of an IP address from the host portion of an IP address. Tracert.exe A utility used to follow the communication path from router to router between the source and destination hosts. Windows Internet Naming Service (WINS) A service that runs on one or more Windows NT, Windows 2000, or .NET servers in the network.
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10
Supporting Network Connectivity
Questions and Answers
Lesson 1 Review
Page 10-15
1. List the required and optional parameters that you can assign to a host on a TCP/ IP network.
You must assign each device a unique IP address, a subnet mask, and a default gateway. Optionally, you can also assign hosts the addresses of DNS and WINS servers.
2. List the three primary address classes used for assigning IP addresses to hosts on the Internet and the corresponding range of IP addresses available in each class.
IP addresses are divided into five classes: A, B, C, D, and E. Hosts on the Internet are assigned IP addresses from the first three classes only: A, B, and C. The network IDs for Class A addresses range from 1.0.0.0 to 126.0.0.0. The network IDs for Class B addresses range from 128.0.0.0 to 191.0.0.0. The network IDs for Class C addresses range from 192.0.0.0 to 223.0.0.0.
3. Which of the following default subnet masks would be used on a computer con nected to the Internet with the IP address 157.54.4.201 A. 255.0.0.0 B. 255.255.0.0 C. 255.255.255.0 D. 255.255.255.255
B is the correct answer. The IP address 157.54.4.201 is in the Class B range of addresses. The default subnet mask for Class B addresses is 255.255.0.0. A is not correct because 255.0.0.0 is the default subnet mask for Class A addresses. C is not correct because 255.255.255.0 is the default subnet mask used for Class C addresses. D is not correct because 255.255.255.255 is an invalid subnet mask.
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