Networking: A Beginner’s Guide Fifth Edition- P22 docx

... model, the application layer. Network layer units of data, such as those carried by IP, are called datagrams. Units of data carried at the data-link layer (layer 1) are called frames. All of these ... than IP, at the transport layer. TCP manages connections between computers. TCP messages are carried (encapsulated) in IP datagrams. The User Datagram Protocol (UDP) serves the same role as...

Ngày tải lên: 05/07/2014, 04:20

... physical layer so the network layer (layer 3) can transmit its data. The data-link layer typically includes error detection and correction to ensure a reliable data stream. The data elements carried ... part of the physical layer. Data-Link Layer The data-link layer, layer 2, defines standards that assign meaning to the bits carried by the physical layer. It establishes a reliable prot...

Ngày tải lên: 05/07/2014, 04:20

... guessed it a much thicker coaxial cable called RG-8. Figure 4-6 shows an example of coaxial cable. Fiber-optic cable uses a glass strand and carries the data signals as light instead of electricity. ... using connectors and patch cables that also meet that level of performance. For example, for a Cat-5 installation, you must have Cat-5 cable, connectors, patch panels, and patch cabl...

Ngày tải lên: 05/07/2014, 04:20

... You are asked whether to perform an upgrade installation or a custom (clean) installation of Windows Server 2008, as shown in Figure 16-5. If you are installing on a computer that has an upgradable ... log in. 12. After you set your password and log in, you will soon see the new server’s desktop, along with the Initial Configuration Tasks window (which appears automatically), as show...

Ngày tải lên: 05/07/2014, 04:20

... checkbox. You can choose any combination of roles that you need, and the wizard will walk you through any necessary additional setup with a minimum of hassle. In this example, we are installing Windows ... networking 246 Networking: A Beginner’s Guide CAUTION Join an existing forest only if you are the network administrator responsible for the existing Active Directory forest, a...

Ngày tải lên: 05/07/2014, 04:20

... recommends that each domain controller also act as a DNS server, and you must have at least one primary and secondary DNS server for each managed zone. Understanding RRAS Routing and Remote Access ... DNS Manager window. When you set up DNS for an organization, you first establish a root namespace (a virtual location in which domain names are stored), usually using the domain name...

Ngày tải lên: 05/07/2014, 04:20

... Command-Line Basics Historically, the aspect of UNIX that makes it so powerful and flexible has been the options available through the command line. Casual observers of UNIX gurus are often astounded ... 331 Chapter 21: Introduction to Linux Systems Administration to IP addresses, and vice versa. Many times, the appropriate DNS servers to use are automatically assigned through the ... ast...

Ngày tải lên: 05/07/2014, 04:20

... embed commands as parameters to other commands. A common instance of the use of this character is to pass a number sitting in a file as a parameter to the kill command. A typical instance of ... Environment Variables To set an environment variable, use the following format: [root@ford /root]# variable=value where variable is the variable name, and value is the value that you want t...

Ngày tải lên: 05/07/2014, 04:20

... Directory Access Protocol data channels (D-channels), 82 data communications equipment (DCE), 50 data corruption, 172 data terminal equipment (DTE), 50 data transfer, synchronous, 79 database client/server, ... 167 datagram, 90 data-link layer, 30 DCE. See data communications equipment D-channels. See data channels dd command, 344, 344 decimal numbering system, 12, 13–14 decimal points, 13 de...

Ngày tải lên: 05/07/2014, 04:20

... on. A NIC, for example, is part of the physical layer. Data-Link Layer The data-link layer, layer 2, defines standards that assign meaning to the bits carried by the physical layer. It establishes ... 28 Physical Layer 30 Data-Link Layer 30 Network Layer 30 Transport Layer 31 Session Layer 31 Presentation Layer 31 Application Layer 32 Understanding How Data Travels Through the OSI Layers...

Ngày tải lên: 27/06/2014, 00:20