Home Download | Exchange Server | Feedback | Index | ISA-Server | Jokes | Terms of Service/Usage Policy | Windows Security | What's New | White Papers
 
 Networking Topics
Windows XP Prof
Windows XP Home
Windows 2000 Server
Windows 2000 Prof
Windows NT4 Server
Windows NT4 Work.
Windows ME
Windows 98
Windows 95
Windows 3.x
MS-DOS

Step-By-Step
Network Basics
Trouble Shooting

Exchange Server
e-Mail Security
e-Mail Spam
ISA-Server
Server Software
Windows Security
 
 Featured Product
 
 Network Addons
Direct Cable
-
Serial / Parallel
-
Infrared
-
USB
-
High Speed Cables
-
WLAN - Wireless
-
Jokes ( computer )
-
Download Site

TCP/IP advanced: Ports

You have a basic understanding of TCP/IP ( IP-address, subnet-mask, Gateway, DNS, DHCP,....),
but now it is time to look at an advanced issue, which has a serious impact on network security,
especially when using TCP/IP to connect to the Internet: Ports.
Let's start by looking in the Control-Panel at "Internet Options" :

Connection a single PC to the Internet
is easy, it becomes more complex when
you connect a network of multiple PCs
via a single connection to the Internet.
In such cases, you will need a
Proxy,
and you need to configure on the
tab: Connections the "Lan Settings"
,
where you need to define PORT information.



TCP/IP is a complex protocol, offering multiple services (especially on the Internet), like:
- HTTP (=Web-Browsing)
-
FTP (File Transfer Protocol)
- e-mail
- file sharing
For each of these services, a kind of "sub-dialect" of TCP/IP is used, call : PORT.

Each PORT has a number assigned to it, here a list of the most common PORTS:

PORT: Service: Purpose / usage :
21 FTP FTP: File Transfer Protocol, often used to download software programs and / or
updates from the Internet
23 Telnet Telnet allows to work with a command-line interface on a System,
originally developed for UNIX (so it includes now LINUX systems ! ),
but also available on some NT-systems
25 SMTP used to send e-mail messages to an Internet Mail Server
80 HTTP used to retrieve WWW pages
110 POP3 used to receive e-mail messages from an Internet Mail Server
139 NETBIOS used for Microsoft networking to handle File-Sharing
443 HTTPS used to retrieve SECURE WWW pages

To protect your system against attacks from the Internet using one of these TCP/IP ports, you
should install a
Personal Firewall.

WindowsNetworking.com is in no way affiliated with Microsoft Corp.
Copyright © 2014, TechGenix Ltd. All rights reserved. Please read our Privacy Policy and Terms & Conditions.