A FQDN consists of a host, a second-level domain and top-level domain.

For example, www.ecomputernotes.com is a FQDN. www is the host; area is the tertiary sector; ecomputernotes is the second level domain is .com is the top field.

A CNAME is simply an alias for a host record. The CNAMEs allow you to have more than one DNS name for each host record. The CNAME points to the parameter A. So if you change your IP address in the parameter A, all your CNAME records follow the new IP address of the parameter A. [Read more…] about What is a CNAME?

The IEEE 802.22 Working Group started its activities in 2004 with the aim of achieving a regional radio network. The frequency bands used are primarily the digital dividend, that is to say the frequency bands that will be freed when television will fully and finally digital. In France, it is planned for 2010. In the rest of the world, this should be spread between now and 2015. [Read more…] about What is WRAN?

Today, hundreds of major companies market TCP / IP products. It is they who decide the placing on the market of new technology, not the researchers, as originally. The governance of the Internet has been completely redesigned in the late 2000s Authority over the Internet central coordination functions exercised by IANA (Internet Assigned Numbers Authority). In fact, it’s Jon Postel who held that office until his death in 1998. Today it is ICANN performs that function. [Read more…] about Standardization of IP Networks

In the late 1960s, the US Department of Defense decides to make an extensive network from many small networks, all different, which begin to abound everywhere in North America. We had to find a way for these networks to coexist and give them outdoor visibility, the same for all users. Hence, InterNetwork (interline), abbreviated as the Internet, data this network of networks. [Read more…] about Internet Architecture

The user generates IP packets, it is necessary to transport these IP packets to the ADSL modem. For this, we use an Ethernet frame, a PPP frame, a USB frame, or a superposition of these frames as a PPP frame encapsulated in an Ethernet frame or a PPP frame encapsulated in a USB frame. [Read more…] about What are the ADSL Protocols?

The metal lines have been used for decades for the transport of the telephone speech with a bandwidth of 3200 Hz. They are used today for transport, at the same time as the telephone, broadband data packets. The xDSL environment is devoted to terrestrial broadband connections, we give here in an introduction. [Read more…] about What is xDSL(Digital subscriber line)?

File sharing is when a person on one computer can use the files from another computer while the file is still on the other computer. The computers that want to share files with each other must be connected via a network. [Read more…] about What is File Sharing?

In a computer network,the file server is the computer responsible for storing and retrieving the files used by all the computers connected to the network. [Read more…] about What is File Server?

E-mail is short for electronic mail, mail you can send or receive directly on your computer. Yes, with e-mail people can actually write you letters and send them to your computer, and you can turn on your computer and go pick up your mail whenever it’s convenient. Many a love affair has begun through e-mail. I know. It’s really fun, too. And useful, of course. E-mail can be a verb too, as in “I e-mailed my lover a letter from Lhasa.” [Read more…] about What is email?

CompuServe (whose formal name is CompuServe Information Services, or CIS for short and sometimes CI$ for a statement) is a commercial online service that you can access through your modem. It has an incredible array of forums (sections devoted to particular interests), conferences, facilities for uploading and downloading information, and all the other benefits a powerful online service offers. [Read more…] about What is CompuServe?

The application of FILE COMPRESSION algorithms to digital sound files to reduce their required storage space and hence their download time over low-bandwidth communication links such as the Internet. Lossless audio compression can be achieved using exactly the same algorithms as for any other kind of digital data. However, as with visual images, compression is most effective when some quality is sacrificed (so-called LOSSY compression methods), and the most widely used compressed formats such as MP3 and REAL AUDIO use such methods to achieve compression ratios on the order of 60:1 to 80:1. [Read more…] about What is Audio Compression?

A service provided on many Internet servers that permits a casual visitor to download files using the FTP file transfer protocol without needing to possess a named account or password. The user merely logs in under the name ‘anonymous’ or ‘ftp’ and uses his/her email address as the PASSWORD, and is then granted access to a restricted set of directories that have been reserved for public access (and which are typically separated from those used by the local users).

4G is a packet-switched technology that uses bandwidth much more efficiently, allowing each user’s packets to complete for available bandwidth, and billing users for the amount of data transmitted. It also solves the non-standardization problems associated with 3G networks for voice, video, and data transmission. [Read more…] about What is 4G Wireless?

File transfer protocol is the way files are transferred from the server to the client across the network. [Read more…] about File Transfer Protocol (FTP)

Initially developed by Sun Microsystems Incorporated, the NFS provides on-line shared file access that is transparent and integrated; many TCP/IP sites use NFS to interconnect their computer’s file systems. From the user’s perspective, NFS is almost invisible. A user can execute an arbitrary application program and use arbitrary files for input or output. The file names themselves do not show whether the files are local or remote. Network File System allows the user to access, read, and modify a file on a remote device, (on the same network, usually), as if it were on the client machine.