Networking Guides for Beginners.

Best useful guide for Engineering and Corporate Studies.


1. What is DHCP?

DHCP (Dynamic Host Configuration Protocol) is a communications protocol that
lets network administrators centrally manage and automate the assignment of Internet
Protocol (IP) addresses in an organization's network.

Without DHCP, the IP address must be entered manually at each computer in an
organization and a new IP address must be entered each time a computer moves to a new
location on the network. DHCP lets a network administrator supervise and distribute IP
addresses from a central point and automatically sends a new IP address when a computer
is plugged into a different place in the network.

2. What is DNS?

Domain Name System (or Service or Server) is an Internet service that translates
domain names into IP addresses. Because domain names are alphabetic, they're easier to
remember. The Internet however, is really based on IP addresses.

For example, the domain name www.example.com might translate to 198.105.232.4.

Port number for DNS: 53

3. What is SMTP?

Simple Mail Transfer Protocol, a protocol for sending e-mail messages between servers.
SMTP is generally used to send messages from a mail client to a mail server.

Port number for SMTP: 25

4. What is POP3?

POP3 (Post Office Protocol 3) is the most recent version of a standard protocol for
receiving e-mail.

POP3 is a client/server protocol in which e-mail is received and held for you by your
Internet server. With POP3, your mail is saved for you in a single mailbox on the server.

Port number for POP3 is 110.

5. What is IMAP?

IMAP (Internet Message Access Protocol) is a standard protocol for accessing e-mail
from your local server.

IMAP (the latest version is IMAP Version 4) is a client/server protocol in which e-mail is
received and held for you by your Internet server.

With IMAP, You can create and manipulate multiple folders or mailboxes on the server,
delete messages, or search for certain parts or an entire note.