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2011-07-27 08:59:55|  分类: 默认分类 |  标签: |举报 |字号 订阅

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When computer networks are operating well, that we have a Best Mac Concealer tendency to hope is normally, the inner workings of the system modules are clear to the typical user. The most common parts on a laptop network, not counting cables, are "routers", "hubs", and "switches". Several of these modules can be similar cosmetically. Every assembly typically has Ethernet connectors (RJ45, which looks like an oversized phonephone plug) and LED indicators. However, these modules operate differently, and it's important to understand the differences. Modern network hardware operates on the "Open System Interconnection" (OSI) standard. This customary defines how communications on a network should be implemented. By conforming to the present normal, modules from different manufacturers Mac Eye Pencil will coexist on the identical network. Wireless networks (WiFi) and therefore the 802.11X customary are a further subset of network systems. When a message is sent between computers, it's broken into parts. At the bottom level, the message is reduced to "1" and "zero" bits. The following level could be a group of bits called a "frame". A frame contains its management info, as well as target address and error detection. The next level could be a cluster of frames called a "packet". The terms frame and packet are sometimes used interchangeably. If a message is sent on a complex network just like the Net, a number of the packets might take a different path, and be recombined at the destination. Error detection is employed with each frames and packets. The foremost common routine is named "Cyclic Redundancy Check" (CRC). CRC sums of all the "one"s within the frame or packet. This variety is stored as a hexadecimal price at Bangles the tip of the frame/packet. At the receiving finish, the process is repeated. If the two hexadecimal values agree, the take a look at passes. If not, the receiving device requests that the sending device resend. Most of this functionality is performed by integrated circuits (chips) within the network modules. The Hub The network hub operates on the first layer of the OSI customary, known as the "physical layer". The hub is the most simple of the three modules. A hub is not awake to the contents of the message that's processed; it handles the message as bits. It merely records the signal, and rebroadcast it to any or all, together with back to the port that sent the message. An "active" hub can clean the electrical Tory Burch Caroline signal of noise and amplify the signal before rebroadcast. A "passive" hub does not amplify the received signal; it just receives a symptom, and rebroadcast the signal as received to each port. Hubs are typically used to link multiple computers with a printer.
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