Why should we use Vlan technology?

The first problem solved by the remote access technology is the limitations of the region. Users no longer need to be in the scope of the enterprise's local network platform, and access enterprise network application services through LAN access. In addition, another problem solved by the remote access technology is flexibility. No matter where the user is-at home or on a business trip in another city, the remote access technology can be used to access the enterprise's internal network platform.

To achieve these goals, remote access technology must use public transmission media. In other words, enterprise private network platforms cannot implement this function, although some network technologies can break through the LAN coverage, so that the transmission distance can reach several kilometers or even dozens of kilometers. Regardless of the construction cost, the requirement of Flexibility alone cannot be met by the private network.

Various access channels are emerging

For these reasons, remote access technology has long been using the most common and ubiquitous transmission media-PSTN (public telephone network ). Use Modem analog dialing technology to achieve remote connection. Using PSTN for remote access, users only need to use a telephone line and a common Modem. for users, the one-time investment is very small. Of course, if you want to obtain both the data service and the analog telephone fax service, you have to apply for another number, because in this communication mode, both data and analog communication require an exclusive Channel. Enterprises need to set up remote access devices on the edge of the LAN and provide a certain number of voice relay lines for remote access users to dial in.

Despite years of development, the remote dial-up access method of PSTN is a helpless choice for a large number of remote access users. Problems such as insufficient bandwidth, slow access speed, and poor service quality severely impede the development of remote network applications. User complaints are increasing, and remote users need fast and high-quality access methods. Especially with the emergence of emerging network applications in recent years, the requirements for network bandwidth and the sensitivity to latency are getting higher and higher. The maximum speed of PSTN dial-up access is 56 kbps, which is far from meeting today's application requirements.

Therefore, some access technologies have emerged. From the use of telephone lines as the transmission media xDSL, to the use of Cable Modem by Cable TV cables, to Ethernet access by man, various new technologies emerge one after another, and the upgrade is extremely fast.

XDSL broadband access includes ADSL, CDSL, HDSL, IDSL, UDSL, and so on. A typical example is ADSL, which is an asymmetric digital user line. ADSL is considered to be one of the access technologies with broad application prospects in the 21st century. It will replace the traditional Modem analog access method and become the mainstream access technology for household and small business applications.

Cable Modem is a Cable Modem that modulated data on a Cable, then, the receiver transmits the modulated signal within a certain frequency range of the wired network, parses the data, and transmits it to the receiver within the same frequency range. The transmission mechanism on the physical layer is no different from that on the modem on the telephone line. It also uses FM or am to encode data. As the cable TV network has the advantages of four channels and eight channels, shared media, good line quality and multi-frequency bandwidth, access to the Internet through the cable TV network has become one of the development directions of Access Technology in the next century.

With the widespread promotion of metro construction and information community, Ethernet, as the most mature and economical network technology, is widely used in the area of Metro access. With its bandwidth advantages and breakthroughs in service quality and security, Ethernet technology is extremely competitive in the bandwidth access field.

The above broadband access technology is widely used in Internet access, but it cannot be directly used for CEN remote access due to its dependence on the transmission media. For example, if you want to use ADSL technology to achieve remote access to the enterprise network, you must provide your own end-to-end telephone lines to access remote users, rather than using the PSTN Public telephone network. This completely loses the meaning of remote access.

Suitable for remote VPN access

Can the above broadband access technology be used for CEN remote access? The answer is yes. The solution is to use the Internet as the transmission carrier and VPN technology to achieve CEN remote access. This solution has the following advantages:

High flexibility

A user can access the Intranet securely at home, on a business trip, or in any other environment as long as the user can access the Internet. It is neither restricted by regions nor by access methods.

High bandwidth

Users can choose to use any broadband access technology provided by local service providers, whether it is ADSL, Cable Modem, or Ethernet Access in information-based residential areas or hotels.

High Security

All traffic is encrypted and compressed and transmitted over the network, providing the highest security guarantee for user information. Today's encryption technology has evolved to use the most advanced computer, and it takes more than a century to decrypt it. Therefore, even if your data information may be stolen during transmission, you do not have to worry about leakage of company secrets.