DHCP and Others

DHCP stands for Dynamic Host Configuration Protocol, and is used as communication protocol that assign dynamic IP addresses to the client computers automatically. DHCP also assign some other configuration setting to client computers for example Subnet Mask, Default Gateway and DNS server addresses. DHCP assign unique IP addresses to all network and without DHCP an IP address must be entered manually at each computer by network administrator.

What is GATEWAY ?

A gate is an electronic device that can perform logical function. A gateway is a system that connects different architectures and environments and translate information from one network to the another network. Gateway is the collection of hardware and software.

A gateway used to communicate between two systems or networks that do not use the same protocols, data format, and architecture. Packets from different networks have different kinds of information in their headers, can be of different formats and architecture. The gateway can take a packet from one type of network, read the header and then encapsulates the entire packet into a new one, adding a header that is understood by second network.

SMTP

SMTP stands for Simple Mail Transfer Protocol and used to sending email messages between different email servers. SMTP is reliable and efficient way to transfer email. Today mostly email systems used SMTP to transfer their email on the Internet and the POP (Post Office Protocol) or IMAP (Internet Message Access Protocol) protocol is used for retrieved email at client end.

ISDN (Integrated Services Digital Network)

ISDN stands for Integrated Services Digital Network. It is a set of standards used to digital transmission of voice and data over already existing telephone line. The ISDN uses the multiplexing technique to carry three or more data signals at once through the telephone line. The data transfer speed of ISDN line is very fast than old dial-up connection. ISDN connections are more useful in applications like videoconferencing, to run online movies and upload and download heavy files. In ISDN line, both ends of connections require the ISDN modem and a special telephone set for voice communication.

Basically ISDN divides its total bandwidth into three channels. The basic two channels send data at the speed of 64 Kbps and third one at the speed of 16 Kbps. The 64 kbps channels carry data, voice, image and movies and 16 Kbps channels carry single information and link management data. A computer connected to ISDN service can use both channels. ISDN is twice as fast than a dial-up connection but not much expensive. Its data transmission speed is up to 128 Kbps.

DSL is much easier to install and provides much faster data transfer rate. ADSL connections are more useful in applications like videoconferencing, to run online movies and upload and download heavy files. This connection is ideal for today business requirements.