My Netwok Dictionary

When using LAN and WAN technologies, many computers are interconnected to provide services to its users. To achieve this, the computers in network take different roles and functions between them. Some types of applications require the computer to function as equal partners. Another type of applications distributed their tasks so that the functions of a computer serving a number of other unevenly.

In either case, two computers usually communicate if using protocols request / response. A computer performs a service request, and the second computer receives and responds. The making the request assumes the role of customer, and the server responds. Read the rest of this entry »

Panorama current on network security:

Network security and data protection has become a primary need in all businesses, especially the extension of networking for mission-critical networks with new intranet and extranet applications and e-commerce. A growing number of companies are looking for security skills and technologies, in order to delegate effectively protect systems and focus on their business strategy. And today is no longer sufficient to address the security concerns with traditional products only for perimeter defense. Read the rest of this entry »

A proxy is a program or device that performs a task access to the Internet rather than another computer. A proxy is a compromise between a computer connected to the Internet and the server being accessed. When we surf through a proxy, we’re not actually going directly to the server, but we made a request on the proxy and it is connected to the server that we want access and returns the result of the application.

When we connect with a proxy server that actually gets you access the application proxy, instead of receiving it directly from your computer. There may be systems that intercept proxy various Internet services. The most common is the web proxy, which serves to intercept the connections to the web and can be useful to increase safety, speed, navigation or anonymity. Read the rest of this entry »

The routing protocols in IPv6 we can appreciate the new performance. So now the domain IPv6 routing protocols for us to talk about in detail. First we look at the network routing protocol type. Routing protocols within the IP domain is currently used mainly two kinds of IS-IS and OSPF. OSPF version called IS-IS for the exchange of IPv4 routing information for the Exchange version called OSPFv3;IS-IS IPv6 routing information for the exchange of IPv4 routing protocol version called IS-IS, for the exchange of the IPv6 routing protocol version is called IS-ISv6. Read the rest of this entry »

The following article will briefly introduce several bandwidth management tips:

1. To ensure smooth network, prohibiting P2P and video :

The status of the enterprise network file downloads, web browsing, mail, and video communications are using the same bandwidth, processing strategy, the company’s key business such as: OA, MIS, ERP, CRM, etc. and the general application of the network (for example: P2P applications, network TV, etc.) to compete for bandwidth, 80% of the network bandwidth applications are usually occupied. So to solve the problem of network congestion, the first to ban P2P software downloads, and online video.

2. Flow distribution tool to be carefully chosen:

i) The key problem is how to resolve network congestion will be rational allocation of bandwidth to each desktop user, some people prefer to allocate bandwidth to a specified IP in fact, and this is not to efficient use of bandwidth. Strain on the resources in the network should be limited to those using the large amount of time users, protect those who use a small amount of users, and vice versa, when the network resources have more free time to cancel these restrictions. Read the rest of this entry »

Construction of double-layer radio access network in the micro-cell network, the wireless LAN system is used as the theme of the network. For the combination of the macro cell network, saving IP allocation, while addressing the network resources and cost. What specifically is the principle of it?

The wireless LAN system consists of wireless access points AP (Access Point), wireless LAN, wireless bridge components, wireless access point AP is used in all the coverage, coverage for indoor 80m, outdoor 500m, can support up to 63 user access. The wireless LAN system follows the 802.11b standard and using direct sequence spread spectrum technology (DSSS), with DBPSK, DQPSK, CCK three types of modulation. Read the rest of this entry »

Network is a complex environment. Many disturbing problems exist, such as viruses, Trojans horses etc. So how do you ensure the security of our network browsing is it? Our network security protocols here have played no small role. Then we introduce several agreements to let everyone know it.

SSL and IPSec:

1. SSL protection in data communication on the transport layer security, IPSec also taught according to the package on the protection of IP layer security, such as a UDP packet. Read the rest of this entry »

As we all know, the switch ports are second-tier Interface, and these interfaces are connected to physical port. In the VLAN, these interfaces can be divided into two kinds of access interfaces and trunk ports. If the switch port is used to access the port, then it can only belong to a specific VLAN; and if the switch port uses a trunk port, then it can belong to any VLAN. So when to use access port, and when the trunk port should the use of it? It needs to be concerned by the network administrator.

The characteristics of access port:

Greatest features is its access ports can only belong to a specific VLAN, it can only carry VLAN traffic. Essentially, access ports traffic received and sent to its native format only, which is not marked with any VLAN tag. That is an access port to reach the data, but simply that the port is assumed to belong to the assigned VLAN. Therefore, network administrators need to bear in mind that the data in the access port without any VLAN tag. Read the rest of this entry »

Some time ago, a unit within the network access appeared in strange symptoms, the main problem is the unit within the network firewall device as a result of a long time. The performance is not very stable, so bought a new brand of firewall device, to replace their old equipment, and had originally thought that complete replacement is done, the better the stability of the network operation; can Who would have thought, the new firewall device put into operation, the unit did not mention the stability of network access not only high, and all terminals within the network can not properly access the system. Such a strange place within the network fault network, an important issue we follow up on the fault phenomena, the investigation.

Dynamic routing failure of the network environment:

Common LAN clients, through 100M are connected to eight twisted pair type of two-story Cisco switches, all the switches through the two-story multi-mode fiber connected to the Cisco core switch models, the core switches within the network through the router platform system; order to guarantee network access security, specifically in the core network switches and routers, hardware firewall devices are placed, and the equipment operating in transparent firewall mode state. In order to prevent broadcast storms and affect the entire local area network to run the virus, network management units specifically to all clients divided into six virtual work subnets, each subnet of the gateway virtual work all the models based on Cisco core switch. Read the rest of this entry »

For any type of switch or hub, you must follow the instructions.

Turn on the hardware box, and confirm its contents conform to the packaging. On the stack or the switch installed in the bracket (the proper use of rubber mats or frame), its location and any device connected to 10BaseT distance of not more than 100 meters, the temperature must be suitable for products, and maintain adequate ventilation.

When selecting cable, use any port through the cable, it had no marked “X” mark. X on behalf of a crossover cable. Type 5 cable is suitable for all ports, 100BaseFX port, except it needs to fiber media. Make sure the power outlet voltage and the voltage indicated on the label is the same, and connect power. Read the rest of this entry »