Category Archives: Network

NFC Technology Allows Securely Electric Payments

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Have you ever heard the term NFC? Have you ever watched a smartphone that features the NFC? What exactly is the NFC? The NFC originated from the forum called Near Field Communication is a non-profit association founded in 2004. This forum aims to implement standardization and promote NFC technology. Until now, the NFC has a membership of about 160 members and consists of manufacturing developers companies and financial institutions.

You must already know the ATM card, in principle; the NFC has similarities with the ATM card. But the difference is that NFC technology is the development of card technology Radio Frequency Identification (RFID) is not necessary to be swiped into a tool but brought near enough to the reader. In several countries have applied to the payment of the freeway paid.

So if your smartphone has NFC features then HP can act as a means of payment as well as a reader. For the first time NFC technology integrated into the SIM card that allows the operator to enter the NFC services directly to the card itself. So that will make it easier when performing data exchange between devices such as moving image files, data, in a more simple and convenient. Even credit card information can be safely stored on the SIM card.

The entire NFC device can read and write information at a speed of 424 Kb / s. NFC connection occurs when there is a connection between compatible devices with Bluetooth and Wi-Fi. What about security? If you have never been lost or stolen your data, then the NFC can guarantee the communication between devices.

Some applications of NFC technology features:

  • With mobile devices that have been integrated with NFC you can make credit card payments.
  • Payment of an electronic ticket for use of highways paid.
  • Download data as a schedule of departure and arrival of planes or trains.
  • Payment of a train ticket, airline or hotel reservations.
  • Download personal electronic documents, photos and other digital multimedia content as well.
  • P2P connection for easy transmission of information between wireless devices

NFC technology will make life easier and more convenient because it’s easier to exchange digital content, conduct transactions and liaison between electronic devices safely and quickly.

What is Cloud Computing?

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Cutting-edge solutions for network computing is cloud computing. While it is often posted on the internet but ordinary people are sometimes still not familiar with cloud computing. What is cloud computing? Cloud computing is a computing concept that provides computing, data access, the latest software and storage services. End users do not did not need to know about the configuration of the system, let alone the physical location of hardware infrastructure.

Applications are given through the internet which is accessed by a web browser, while the data and software stored in the server cloud computing provider. The service is delivered through the sharing of data center and as an access point to be used together. So you do not need a complex computing infrastructure procurement and expensive.

Peer to Peer

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Peer to Peer (P2P) is a distributed network architecture that consists of participants who share resources with each other, coordinated without the need for a central server. Each participant is called by peers, provide and consume resources between one another. The way it works is the server only provides the resources while the client taking them. The resources may perhaps contain bandwidth, disk storage, processing power, and so on.

P2P networks are dynamically formed by nodes that are ad-hoc; interruption of a node does not significantly affect the overall network. All nodes are considered as peers and can take steps as a client and server side functionality.

The larger a P2P network, will increase demand but simultaneously increase the capacity of resources. While the client-server networks, the increasing number of clients will increase demand, but resources will remain the same for server capacity is not increased. The server must serve the client more, which means each client will receive fewer resources. For example in the form of le sharing will be discussed below.

 

Client-server Model

To understand the workings of P2P and the difference with client-server architecture is first known, let’s see first what happens at what time you download files from the Internet.

The first example is when you download files from a website that provide it (the server), then first you will access the site address, and click the link download a specific file. Web browser (client) will communicate with the server to download a copy file from the server to your computer. The transfer process is handled by a protocol such as HTTP (HyperText Transfer Protocol) or FTP (File Transfer Protocol).

File transfer speed is affected by many factors, including the Internet connection you use, the high and low traffic and server performance, protocol type, or number of clients who are downloading files concurrently. If downloaded files are large and high demand for these files, will clearly slow down the download process. How it works is to implement client-server model, server-side that do the sharing of reserves, whereas the client does not do any sharing.

 

P2P model

Contrary to download through the website, the P2P file sharing, and you need software support to find other computers that have the file you want. The computer is a regular computer that uses the similar P2P software with you, called the peer. So peer-to-peer communication and transfer of data showing that occur between these computers.

Each peer can request the file you want to download, P2P software will conclude the location of the files contained on other computers connected, and start the download process to the computer that requested it. A peer can download the file from another peer, and at the same time upload the file to another peer who requested it.

The term leecher quite popular among users of P2P file sharing, shows aimed at users who just download the file you wanted, and immediately disconnect after the download is complete, and not allow other users to retrieve files from it.

Knowing the DLNA Certified

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DLNA is a way of revolution can change the user to discover, download, store, send, printing digital content and game play. Some of these devices can connect and communicate with each other. What is needed is a network either wired or wireless. Just as broadband internet.

Digital Living Network Alliance (DLNA) initiated by Sony in 2003. From the beginning DLNA is a non-profit trade alliance has a membership of 250 companies. That DLNA is a standard-based technology used to facilitate the users to exchange content. Each device can give or receive photos, music, videos, etc. from one device to other devices that are both certified DLNA. Until the first quarter of 2011, already more than 9000 DLNA certified devices. More than 1000 television that has been verified DLNA.

dlna

Examples of application are: when you have a collection of movies stored in PC networks certified DMS (Digital Media Server). So instead of just watching the movie screen is a tiny PC’s monitor afterward you be able to send the film content to the LED TV in the living room. Obviously the LED TV has been adopted as a DLNA Certified DMP (Digital Media Player). So the film’s content can be displayed by that LED TV.

Nor may the case with music, when you make favorite music list into a PC network. When using DLNA Certified that can be certified as a controller of the mobile digital media (M-DMC), so you can find the song you want, then transferred and played on wireless speakers DLNA Certified.

Obviously daily increasing this DLNA certified products. So users are spoiled with the ease in selecting the preferred device. In enliven their e-life style. It’s a digital living.

Easy Steps to Network Troubleshooting | Part 2

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In part 1 you have to prepare, create documentation, conduct a physical check, try to reboot and make the chronology of events. The following steps are the steps the next alternative.

 

Talking To User

Does the user have to change their system configurations? Installing new software? Do they use the new IP address? If the IP address that they take existing uses, then it could cause problems.

While identifying what is happening, try to think to happen outside the technical side. Human behavior may also be involved. For example, your colleague came after office hours with a laptop. Because no port is empty, he pulled out without telling. But he forgot to connect it back after the next day and you are shocked that the network be down. At first, of course you will consider this complex and mysterious.

 

Where Problems Arise?

Try to identify where problems arise. Is the problem appeared on only one application or all applications? Is the trouble only on one computer or all computers on the network also experienced the same problem? If only one computer, it stands to reason that the problem is the computer, instead of the network. Try restarting the system, and see if the troule still exists. What is the error message? Just look at the system log.

For example, suppose the NFS problem that we mentioned earlier. What just happened? Electrical surges so that all systems must be restarted. This means that the problem associated with all system restarts. Which applications are problematic? Only on NFS. All works fine. This means the problem is obvious NFS.

 

Use Ping

Still a problem? You do a physical check, it turns out all is fine. Among the network analysis tool, ping is the most useful tools. As you may already grasp, the ping can denote whether you can reach the connections on the other side, including computers, gateways, and printers. If you have, you will indeed be proficient to identify network problems and then find the solution.

 

Still Have a Problem?

The steps that have been done are adequate to conclude most of the problems, but not all. If you’re still having troubles, try to make sure the following points. Damage hardware: network cards, hubs, adapters and other components can be and sometimes are damaged. Try to identify the problem using ping and if necessary try to replace it with a hardware that is definitely working.

Easy Steps to Network Troubleshooting | Part 1

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Prepare Yourself

This job requires a calm mind, although this situation makes you panic. For example: deadlines are waiting, users are complaining to the boss angry. However, we do not get carried away. Rest assured that you can certainly solve the problem. Moreover, the network was able to function. The question is why not now? There must be the cause and you will find it.

 

Create Documentation

Whatever makes your network down, there is a possibility it will happen again. Are you going to remember what happened and how to fix it? Write down the symptoms you can see, the error message you receive, the test you’re doing and what you do to fix the problem.

 

Perform Physical Checks

Most of the problems causes on the network that previously always associated with physical functioning. Take time to check the following things: Is the network card installed properly? Encouragement from the cable network could make the network card a little loose, especially if you don’t fasten it with screws.

Check the LED light on the network card. The green color on the ethernet card shows that he is connected properly to the computer and network. If the LED blinks when you receive or send data, it is also auspicious. Perform the same checks on the hub, cable modem or DSL. While checking, make sure all is connected properly and getting enough style.

Replace the cables to ensure they are functioning. Maybe the cable is broken for no apparent reason, and the new network could function again after the cable replaced. Keep in mind, the LED may remain green, although one or more wires are no longer conduct current. You should be more watchful, chiefly when the cable is too bent. Is there a large motor electric that run close to the ethernet cable? Electromagnetic waves can disrupt the network signal. Make sure the problem exists on your side. Contact your ISP and see if there was a problem on their backbone.

 

Try Rebooting

Found no problem with the physical connection? There may be errors of software. Try to restart all systems are problematic. Often this can fix the problems.

 

Create a chronology of events

If the network is still down after you do a physical check and reboot the system. Try to remember again what events occur before the last time the network function? Did you restart the server? Is the power goes out? Maybe one of these was the cause of the network down.

Hopefully these five steps above have been able to resolve your network problems. If still having problems follow part 2.

 

Cloud Computing and Virtualization

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Associated with storage management solutions, other issues are no less interesting is the virtualization and Cloud Computing. One of the popular virtualization software from VMware Inc. is VMware, which meets the needs of virtual desktops and storage servers. Virtualization software is able to perform an efficient cloning process and the virtual machine boot process faster.

A variety of business applications that are vital and critical (eg MS SQL Server and the database SAP) has begun to move into the virtual platform. Because it required serious treatment that anticipates what if the application fails to run, or run back to the virtual machine if necessary.

To that end, collaboration VMware and Symantec produce Symantec VirtualStore and Symantec ApplicationHA that gives customers the ability to perform critical business application virtualization with confidence, and minimize storage costs on the VMware platform.

Cloud Computing, which is one of the hottest topics today, the adoption of the cloud (either public or private) may be required by the company. Public cloud may be required for applications that are not critical, while the private cloud infrastructure can be built for intranet applications. There are two main problems that Cloud Computing is often a concern of people, namely the availability of data and who can read the data, what if the data is missing or not readable by the party responsible? The answer to this problem is the technology itself, a reliable and informative. This technology is supported by encryption technology that allows customers to have their own private key to access the data. For the record in relation to security and encryption, Symantec made acquisitions in the PGP Corporation and Verisign in 2010.

Cloud Computing will become a new platform, where a variety of applications will switch to that platform. On the security side in the future, encryption can be individualized. People can give permissions/rights only on the parties are allowed to access the data because of security solutions with close/block specific access is not effective. In a market perspective, large companies can do a review about optimization and data center management, while for small/medium enterprises can also consider the full range of reliable solutions available.

Networking Troubleshooting

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Determining Troubleshooting Method.

Network troubleshooting is when you resolution troubles by identifying and resolving problems. Example if you treat the servers to send directories to the client. Since the power goes out, then a server and a client go down. When the power is on, reboot both devices. After logging in the client, you necessitate to access the directory on the server, but can not. What happened?  There are quite a few methods that you can apply:

I. OSI Model

The basis of each method of troubleshooting here is OSI Model reference. If you don’t grasp what the OSI model, in a nutshell it is a network model that consists of seven layers, where the structure of the uppermost layer is:

  1. Application
  2. Presentation
  3. Session
  4. Transport
  5. Network
  6. Data Link
  7. Physical

The workings of the OSI model is run from the Application to the Physical layer, then headed to the Physical layer receiver via an intermediary network with a physical medium (such as an Ethernet cable). From there, data goes to the upper application layer to the receiver.

When data has arrived, the receiver turn into the sender. And the sender to the receiver. The retort from the receiver goes back and forth the contradictory path, and retrace to the primary sender. Hence, but there is one layer that is not performing, then the data could not run. For case in point, if the Session layer does not function, then the data will not be able to proceed from the Network layer to Transport layer.

II. Bottom-Up

This method starts from the bottom layer, the Physical Layer, a new upward toward the Application Layer. Physical Layer includes a network cable and network card. So, if there is a network cable is disconnected, then do not always do the troubleshooting. You should fix the problem first before proceeding to the Physical Layer. Having solved the problem, check it whether there is still interference. If yes, continue troubleshooting to display the data links. For example, if for example there is an entry the same MAC on the switch MAC address table, then fix the problem first before checking on the network layer (eg. IP address or routing).

III. Top-Down

The same as the bottom-up method, only the top-down methods, troubleshooting starting from the uppermost layer, the layer of new Application heading down to the Physical Layer.

IV. Divide and Conquer

This method takes a bit of instinct. This method can be started from anywhere, if you get by the cause of the problem. From there, you can go up or down.

 

So which method is chosen? Follow your intuition, where about problems that occur. For example, if the user can not browse the internet, and you think it’s because of the many browser setting, afterward you be able to use a top-down method. In contrast, if the user has just connect the notebook to the network and can not browse the internet, you can use a bottom-up method because the user is most likely the network cable is damaged or because of similar problems.