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Buffer header structure Diagram and introduction Figure 1: Buffer header: Each data block is read into the buffer cache, will first in the buffer cache to construct a buffer Header,buffer header and data block one by one corresponding. The main

Recently saw a lot of people asking about the switch, hub, router is what, function, what is the difference, the author on these questions to do some simple answers. First of all said Hub, that is, hubs. Its role can be simply understood to connect

Object-oriented database system Object oriented data base system, referred to as Oodbs, is a product of the combination of database technology and object-oriented programming method. The research of OO data model and object-oriented database

The first set of 801.11AC chips is coming, but 802.11n may still exist for many years, whether it is for business or home use. However, the N standard commitment of 300Mbps (megabits per second) is rarely implemented, and it has proven to be a huge

QoS interpretation You can add/remove quality of service (QoS) rules here to ensure that different bandwidth and priority are provided for each traffic. In layman's terms, it is limiting the bandwidth of each group to maximize the effectiveness of

The internet has grown rapidly with e-mail and www Two free services, prompting rapid growth of Ethernet. Now more and more manufacturers to enter the Ethernet market, new brands and new products continue to emerge, it seems that there has been a

During the catalog backup recovery process, the import job terminates abnormally under certain conditions. At this point, catalog will be in a damaged state: The original catalog can not continue to use, import job can not continue. This article

I. Overview Nowadays, with the development of information technology, data transmission is very important, and it is an important subject of materials science to seek faster speed and more information transmission media for the application of

When the enterprise consolidates the data center and voice technology, it may consider the environmental conditions to meet the needs of the new equipment, but when the enterprise switches from TDM to IP, it is often neglected to meet the needs of

Components of a ganglia Ganglia includes the following program, between them through the XML format to pass monitoring data, to achieve monitoring effect. Gmetad This program collects the data for each cluster and updates it to the RRD database.

The working state of network equipment is directly related to the running state of network, after a long period of work, the network equipment working status is very easy to error, in fact, in the resolution of network equipment work caused by

Windows has many ports that are open by default, and Internet viruses and hackers can connect to your computer via these ports when you surf the Internet. In order to make your system a fortress, you should close these ports, mainly: TCP 135, 139, 4

1 cabling standard for copper-cable twisted pair Line 6 Integrated wiring copper twisted pair Line 6 line standard has been formally introduced. With the rapid development of computer technology, people's demand for fast communication has increased

DDoS is the abbreviation for "Distribution denial of service" in English, which means "distributed Denial-of-service attack". This attack method uses the same method as an ordinary denial of service attack, but the source of the attack is multiple.

As you know, wiring standards for the structure of its system has a clear and detailed provisions. For example, it is stipulated that the wiring system should be a layered star-like topological structure; for example, specify the link from the

Maintenance is important when you are setting up to use the Windows Server service. Let's talk about how to maintain and troubleshoot DNS failures. First, the use of dnscmd to facilitate the maintenance of DNS system Similar to UNIX or script

The PURE-FTPD is a free (BSD), secure, high-quality and compliant FTP server. Focus on operational efficiency and ease of use. It provides a simple answer, he meets the popular needs, including ordinary users and host suppliers. PURE-FTPD has been

Objective My computer under the Ubuntu, Wireless has been a problem, the current problem is not to build WiFi, this problem is puzzling me for as long as a year. After the Ubuntu upgrade to ubuntu14.04, the use of two foreign methods to build a

This article mainly describes the new important security mechanism in the FreeBSD 5.0 operating system, that is, the use of mandatory access control mechanism (MAC) and source code analysis, including mandatory access control framework and

Using MPath devices After the mapping is generated with multipath, multiple devices pointing to the same link are generated in the/dev directory: /dev/mapper/mpathn /dev/mpath/mpathn /dev/dm-n But their origins are completely different: