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Lesson 1
Painting Quick Response Code In VS .NET
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QR Scanner In .NET Framework
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Understanding Network Infrastructures
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Barcode Reader In Visual Studio .NET
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Lesson 1: Understanding Network Infrastructures
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A network infrastructure consists of many interrelated technologies and systems. Network administrators must become proficient in these technologies to maintain, support, and troubleshoot network functioning.
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Throughout this training kit, Windows Server 2003 and Windows Server 2003 family refer to the following family of products: Microsoft Windows Server 2003, Standard Edition; Microsoft Windows Server 2003, Enterprise Edition; and Microsoft Windows Server 2003, Datacenter Edition. Specific editions of the Windows Server 2003 family will be called out as appropriate. (Although Microsoft Windows Server 2003, Web Edition is also part of the Windows Server 2003 family, Web Edition does not necessarily support the features dis cussed in this training kit.)
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After this lesson, you will be able to
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Describe the difference between a physical and logical network infrastructure Describe several elements of a Windows Server 2003 network infrastructure
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Estimated lesson time: 20 minutes
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Defining a Network Infrastructure
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A network infrastructure is a set of physical and logical components that provide the basis for connectivity, security, routing, management, access, and other integral fea tures on a network. Most frequently, a network infrastructure is both inherited and designed. If a network connects to the Internet, for example, certain aspects of the network, such as the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite, are inherited from the Internet. Other network aspects, such as the physical layout of basic network ele ments, can be designed when the network is first created and are then inherited by later versions of the network.
Physical Infrastructure
A network s physical infrastructure is its topology the physical design of the net work along with hardware components such as cabling, routers, switches, bridges, hubs, servers, and hosts. The physical infrastructure also includes technologies such as Ethernet, 802.11b wireless, Public Switched Telephone Network (PSTN), and Asyn chronous Transfer Mode (ATM), all of which define methods of communication over certain types of physical connections. Familiarity with the physical infrastructure of a
1
Understanding Windows Server 2003 Networks
network is considered prerequisite knowledge for the 70-291 exam, and as such, this topic is beyond the scope of this training kit. Figure 1-1 shows an example physical infrastructure.
PDA with wireless modem
Wireless
WAP phone
DSL connection
W ire ss le
PSTN
Internet
Router
Dial-up
10 Mbps Ethernet
Router
100 Mbps Ethernet
Desktop PC
Laptop
Firewall
UNIX server (Web)
100 Mbps Ethernet
100 Mbps Ethernet s bp t M 0 rne 10 the E
5 Apple computers
Windows Server 2003 (SQL database)
s Switch b M et n er
25 Windows XP PCs s b t M r h
e ne p
s bp t M 0 rne 10 the E
Windows Server 2003 (Intranet)
Figure 1-1 Physical infrastructure of a network
Lesson 1
Understanding Network Infrastructures
Logical Infrastructure
The logical infrastructure of a network is composed of the many software elements that connect, manage, and secure hosts on the network. The logical infrastructure allows for communication between computers over the pathways that are described in the physical topology. Example elements of the logical infrastructure include network components such as Domain Name System (DNS), network protocols such as TCP/IP, network client software such as Client Service For NetWare, and network services such as the Quality of Service (QoS) Packet Scheduler. Once a network has been designed, the maintenance, administration, and management of its logical infrastructure requires intimate familiarity with many aspects of the network s technologies. For example, the network administrator of even a small organiza tion needs to know how to create various types of network connections; how to install and configure network protocols required for various network needs; how to configure manual and automatic addressing methods appropriate to network needs; how to configure name resolution methods; and how to troubleshoot network problems related to connectivity, addressing, access, security, and name resolution. In medium and large networks, network administrators must routinely perform more complex tasks, such as configuring remote access through dial-up connections and vir tual private networks (VPNs); creating, modifying, and troubleshooting routing interfaces and routing tables; creating, supporting, and troubleshooting security based on public key cryptography; and making maintenance decisions for heterogeneous networks that include operating systems such as Microsoft Windows, UNIX, and Novell NetWare. Figure 1-2 illustrates an example logical infrastructure.
1
Understanding Windows Server 2003 Networks
Routers
Perimeter
Firewalls
Networking services DNS
Web tier services IIS
Messaging services SMTP
Network devices site VPN
Networking services client VPN
Networking services proxy
Internal firewall
Directory services (internet) Management Tools server server
Directory services (corporate)
Networking services DNS, WINS, DHCP (internal)
Server deployment services
Management Managing services services
Data services
File & print services
N A S Storage services
F01NI02
Figure 1-2 Logical infrastructure of a network
Analyzing Windows Server 2003 Networks
The following sections describe many of the logical elements of Windows Server 2003 networks.
Network Connections
In Microsoft Windows, network connections are logical interfaces between software (such as protocols) and hardware (such as modems or network adapters). Network connections can be seen in the Network Connections window, shown in Figure 1-3. Connections are prioritized and are normally configured with various types of protocols, services, and client software.
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