At present, almost any slightly larger businesses and schools will create a local area network for use, the network has been ubiquitous. As a local area network administrators, network speed is care for, and how effective use of bandwidth, to avoid unnecessary loss of velocity to achieve the optimization of the entire network, is a very important issue.
This paper attempts to discuss the impact of enterprise network performance on a number of factors, hoping to help the reader.
First, the success of the design
Design determines the speed of the entire network. A good overall network planning and design can not only meet the performance requirements, and use the minimum capital investment, should also be easy to support the future expansion of the network processing. Web design is a very big issue, switches and routers from the selection and configuration, to an integrated cable, there are a lot of knowledge. The author's personal recommendations, please, a very very experienced designers, or hire network cable is a business company the best choice for the initial network construction. The author of early personal experience is that the same equipment, there are two different connection methods, in accordance with the theory that the two are equivalent, but no matter how try that is, even without the Internet, was an expert only slightly altered a line position, it connects. Lots of times, experience important than textbook knowledge.
Typically, a few good design to satisfy my requirements:
Function: the network must be able to work. It should allow users to meet the job needs to be a reasonable speed, and reliability to provide users with "user to user" and "user to the application" link.
Scalability: The network should be able to grow. The initial design should be able to make large changes in the right situation where the network growth.
Adaptability: The network design should have a long-term vision, taking into account future technological developments. Also, new technologies should not contain restrictions on the factors in the network launch.
Easy manageability: should support network monitoring and management to ensure sustained and stable operation.
Second, services, servers and QoS
Enterprise networks are often determined by the stability or otherwise of some of servers and services are critical and stable operation. Typically, in a modern enterprise, will use a number of MIS, ERP system to manage the enterprise. In some large enterprises, even to achieve a complete computer-based information systems management and operations. Therefore, in order to ensure the smooth operation of the entire enterprise, network management must at all costs to ensure the stable operation of these information systems.
Enterprise management information system in general most of the use B / S (such as SAP) and C / S (J2EE and. NET) architecture. Whatever the framework, a high-end server is essential. Modern technology such as J2EE, etc. Although the stable and reliable, but the server load is several times earlier. By using two-or four Xeon processors, SCSI interface hard disk, RAID array, or increase the memory can greatly enhance server performance. Meanwhile, in order to buy a brand-name servers, or upgrade to a Gigabit Ethernet network card instead of 2,30 dollars "to spread the goods" is also a good way. Of course, in view of Oracle, BEA, IBM, etc. have increased recently for Linux support, all products are ported to Linux platform, while Linux does feature in the service better, so you may wish to consider Linux. If the company's very large, then the use of IBM, HP and other manufacturers of servers and complete solutions far better than a good normal server you think.
face = Verdana> QoS switches and software vendors recently initiated such a technology, QoS can guarantee stability of business critical services, through the switch to retain a certain bandwidth to critical service data packet, the key service performance can be guaranteed. However, QoS in the open means that more than 20% of the normal rate of loss of network communication, so for intensive enterprise networks and online business network, open the QoS, otherwise, turn it off.
Third, routing, switching
Switches and routing configuration is also very important factors in network performance.
Said first switch configuration, usually to improve performance for the most common method is to set the VLAN. VLAN is the same way the physical connection through a different virtual subnet. VLAN biggest function is to prevent broadcast storms. In general, if a broadcast packet network communications package for all accounts over 30% on network performance dropped significantly. Now, almost all of the switches offer a VLAN support. Although the VLAN settings are a little bit of trouble, but because of their significantly improved the performance of the proposed network can be configured VLAN. The relatively high frequency of visits set up the computer in the same VLAN, the largest computer separate independence, the performance improvement will be obvious. In addition, network cards and switches to open full-duplex support, but also bring improved performance. At the same time, different network switches (Cisco and 3COM, etc.), have their own patented technology can improve the speed of the switch.
Function of the router to connect two different networks, the SMEs usually the top switch connected to Internet, and LAN as a bridge, router is a very complex machine with high-level. Of course, the router is very expensive, if the performance of SMEs do not ask for the Internet, simply by installing the establishment of a Windows Internet Access Server as an Internet server connection, or rely on the Linux machine is cheap and easy as the soft route, more or one Internet and LAN connected computer to install a proxy server software (Microsoft Proxy Server / Unix Squid). However, the router function is very powerful, but also has very good speed. So, for the circumstances, a company should try to choose to buy a router, and the purchase of speed sufficient to meet the business requirements of the router. Routing Protocol is generally connected ISP's PPP, configure, not many can be improved, part of the router supports ACL access control, configuration can be shielded by a reasonable part of the flow, increase network bandwidth.
4, bottlenecks, traffic
Internet packet sniffer network must always be the case, find out what the Internet transmission. If the business has employees in the use of such as online video-on-demand or other P2P software, BitTorrent, when the network bandwidth, especially in export-bandwidth local area network, will have a huge impact. The author's school, this year the number has not increased too much access, but access to public network much slower pace, because this type of point to point links significantly increased. If you care about business and Internet business is the exchange of information, then the network must remind the user or simply block out the firewall software like BitTorrent to ensure the normal flow of enterprise information access.
Through the Internet service provider to buy more bandwidth lines, or provide high-level, high-speed switches that can solve most of the bottlenecks. However, I believe that the key is to make use of existing bandwidth. For example, video on demand, if you use Cisco switching technology based on the IPTV software, we can well solve the internal video network bottlenecks.
5, security and then security
Outside the internal network for DoS attacks, port scan for the impact of very large enterprise networks. So, install a firewall or purchase a hardware firewall, always able to solve many network problems. Especially now that many hacker tools, and useful, there are magazines promote the use of, so networks are potential hazards are enormous (sad ah). Moreover, the network must be on the computer to scan the LAN, see if it is a hacker back door opened, always look at Log Log, to be alert for exceptions. Of course, the most important thing is to always pay attention to the latest software upgrade information, subscribe to security mailing list.
Secondly, within the thieves do not know. So for the switches and routing machine password, must be highly confidential, the network topology, but also as confidential. Routing and switching off the http management services. For important data service units, such as SQL Server, MySQL server, you can disconnect it with the local area network, and needs only a single host connected subnet, or firewall software, allowing only a fixed IP address access.
In short, the sudden drastic changes in network traffic, safety aspects must be caused by a high degree of attention.
802.1x protocol to connect into the network for computer authentication, to avoid even the network was stolen, most of the switches to support the agreement, the proposal to promote the use.
6, details
Connection: Connect each computer in the LAN are achieved with twisted pair, but not the two computers with a simple twisted pair connected to each other, can achieve the communication objective, we must follow a certain connection rules to connect. Twisted pair connection distance can not exceed 100 meters, we need to connect more than 100 meters if the two computers, you must use the conversion equipment. Conversion equipment and switches in the connection, we also must be jumper. This is because the Ethernet in general is the use of two pairs of twisted pair, arranged in position 1,2,3,6, if you are not using two pairs of lines, but the original use of the line pair used separately, would the formation of crosstalk, a greater impact on network performance. 10M network environment this is not obvious, 100M network environment, or if the traffic flow a long distance network will be no access. Of course, do not use low-grade crystal head and lines.
Strict implementation of the grounding requirements: As the transmission in the LAN are some weak signals, if the operation is slightly improper or not in accordance with the specific operation of network equipment required to do so, there may be interference in the network of information, a serious lead the entire network unreasonable. In particular, some network switching equipment, as related to the remote line, its ground was very strict, otherwise the network equipment will not meet the requirements of the connection rate, thus generated in the process of interconnection of various inexplicable failure phenomenon.
Care facilities: the switch group and the server in a small dusty room, of course, would be best if there is engine room. Regularly to see, swept the dust. For the cooling fan, best to double a backup. For cable, at least to be able to have a clue, if a wrong can check out. These can help the network function properly.