There are three basic topologies used in the construction of computer networks:
This topology uses a single transmission channel based on coaxial cable, called a “bus”. All network computers are attached directly to the bus. At the end of the cable-bus set specific caps – “Terminator”. They are necessary in order to extinguish the signal after passing through the bus. The disadvantages of the topology of “bus” should include the following: – data, brought by cable, available to all connected computers; – in case of “bus” damage, the whole network stops functioning.
Topology of “The Ring”
For the ring topology, it is characterized by the absence of endpoint connections, the network is closed, forming an unbroken ring, on which data is transmitted. This topology implies the following mechanism of transmission: the data is transferred sequentially from one computer to another until it reaches the computer of the recipient. Disadvantages of Topology “ring” the same, the topology and “bus”: – accessibility of data – the instability of damage to the cable system.
Topology of “The Star”
In a network with the topology of “star” all the computers are connected with a special device called a network hub, or “hub”, which serves the distribution of data. Direct connect two computers in the network are missing. Because of this, it is possible to solve the problem of accessibility of data, as well as increased resistance to damage the cable system. However, the functionality of the network depends on the hub. Other topologies
Besides the three main considerations, the basic topology is often used as “tree” network topology, which can be regarded as a combination of several stars. As in the case of a star, a tree can be active, or true, and passive. With the active tree in the center combining multiple lines of communication are central computers, and the passive – hubs. They are used quite often and combined topologies, among which the most widely-star bus and star-ring.
A star-bus topology uses a combination of tires and passive star. In this case it connects to the hub as individual computers and entire segments of the tire, that is actually implemented by the physical topology “bus”, which includes all the network computers. This topology can be used by multiple hubs that are connected to each other and forming so-called backbone, the support rail, and each of the hubs are connected with individual computers or bus segments. Thus, the user can flexibly combine the advantages of bus and star topologies, as well as easily change the number of computers connected to the network.
This topology combines the advantages of the star and ring topologies. For example, the hubs can gather in one place at all the points of connection cable networks.
FTP stands for “Communication Protocol” (File Transfer Protocol). A protocol is a language through which computers talk to each other. The FTP protocol allows you to freely transfer files and folders over a LAN or the Internet. In some cases, to gain access to files stored on your computer you may need permission to a computer network administrator. However, quite often with the help of the FTP protocol, it cannot enter some of the networks or servers that do not register for an account and not as the official owner of the password. On these servers, FTP “anonymous access” may contain a variety of information to which access is open with FTP protocol. Internet address (URL) for the FTP server are slightly different from that of the URL, which are used for regular Web pages. For example, the address of the FTP server LAN user-NO, where you can download the files, looks like ftp://vpn.user.net/ for LAN users, and ftp://user.net/ for incoming from the Internet . The level of access to files and folders stored on servers, FTP, depends on whether the user gets access to those servers, as well as on the level of user access on the server FTP.
Access may be limited to viewing or downloading files. In this case, the user cannot rename, transfer to the server or delete files or folders, as with direct access.
Direct access to FTP-sites allow users to work with data stored on the FTP server files and folders as well as with files and folders on your computer. Files and folders can be browsed, downloaded, transmitted to the server, renamed and deleted. If you perform these operations on the FTP server, it is required to obtain permission, you will be asked your user name and password.
What is the FTP-Server?
FTP-server is a kind of library of files. To transfer files between FTP-servers and the user’s computer the FTP protocol is used (File Transfer Protocol).
You can pump out the files on your computer, posted on many FTP-servers. In the web there are thousands of FTP-servers that provide free anonymous access to a wide range of gigabytes of information: text documents, software distribution, photos and music. By FTP-protocol can upload their homepages for free servers, providing a space. It is much easier than to use HTTP, when you specify the files that need to be pumped at special page on the dedicated server.
Actual perceptive users take time to migrate to low-cost dedicated server hosting. The reasons include several variables and requires to respond to various questions. Apart from the fact that the highest devoted servers are chosen for some reason and they are expensive and need someone to organize them. People must calculate all the factors before marching to make further plans. Given next are some of the key aspects that must be remembered.
A major question, particularly emerges is, a dedicated hosting is selected by the user that is not affordable. One is required to perform such a calculation to see an outline of the cost of devoted servers, also to know how many users are required to pay an administrator or can say yes to fully managed devoted servers. This can be expensive, especially if the user does not have a large budget so think for the budget first, before looking for a dedicated hosting .
2. Managed or Unmanaged devoted Server
The second aspect to consider is that, the user requires a managed or unmanaged dedicated server. If one is equipped with the knowledge and know how to manage with it’s own, in case the user can choose an unmanaged server, but if not, then managed server is the best option.
3. Needs Additional Space And Bandwidth
Will users really need space and bandwidth that is provided with a personal server?
In the current state of web pages loading fast enough, and if the user still has enough space on shared servers, then the user should consider why he needs to invest in a devoted hosting .
4. The Existence Of Sensitive Files
Why individuals need a devoted server?
The answer is that they only argue on the information of a person, not a variety of community and business. So, if a user has an ultra sensitive information, he / she cannot take the chance. Maybe it might get stolen; devoted hosting is no doubt an ideal choice in this case.
5. Equipment Needs And Choices
If the user has his own devoted server it means that he must have various tools and options at his fingertips that he / she cannot get if using a shared server. There is no limit to the devoted hosting in India because users can do whatever they want to do. The only factor user needs to consider is that he should not ignore the budget size.
The following guide provides instructions on how to change the strategy of air-handling controls in data center so they can meet the recommended range of ASHRAE and save energy in cooling and humidification. This means that moisture is not controlled by the outside air handler.
First of all, you must first go for the Virtualization – need to virtualize some applications and the company gets the benefits. Usually at this stage, about 30% of virtualized applications.To go further there is the idea that you need to virtualize not only the usual basic applications, but also critical applications – e-mail servers, and databases. Virtualization critical applications – is the second step of the model of IT as a service.
The transition to private cloud hosting
The third step is a transition to private cloud.The first two steps – this is the optimization of IT services. We can create a pool of resources, implement load balancing between resources and a process of automation.
In the transition to private cloud, you get other opportunities.You can create self-service portal. For example, you can choose a specific application and pay for on-demand resource.
Businesses can claim a certain level of IT as an agreement on the service provided (SLA) and this can be done with the clouds.
What is the valuable for the company is a constant IT solutions, services based on SLA, the payment on demand, moving applications within the clouds. VMWARE guarantees the full compatibility between your private cloud and external clouds.
The result is a new IT landscape, we have a large number of devices, the client may need the access from anywhere in the world and this access must be secure. Will be required to support a large number of applications.
Applications and users can work within a cloud – within its own data center. The task of IT is to combine them all together and you have complete control over all of this.