freedom1021

Tuesday, January 16, 2007

(Internet Browser) - Holds information on the times and dates you have visited web sites. Other information can also be saved to your hard disk in these text files, including information about online purchases, validation information about you for members-only web sites, and more.
Cookies provide a means for a Web server to induce a client to store information about itself which can subsequently be called up by the Web server when required. This might be information which the user has supplied about themselves, their preferences or their requirements via forms input. The oft-cited example is the shopping list which might be added to from time to time. Cookies are currently implemented by Netscape and Internet Explorer.

Persistent Client-State HTTP Cookies are files containing information about visitors to a Web site (eg, user name and preferences). This information is provided by the visitor during the first visit to a Web server. The server records this information in a text file and stores this file on the visitor's hard drive. When the visitor accesses the same web site again, the server looks for the cookie and configures itself based on the information provided.

Posted at 08:55 pm by freedom1021
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Wednesday, November 22, 2006

LINUX

LINUX
Linux is a free open-source operating system based on Unix. Linux was originally created by Linus Torvalds with the assistance of developers from around the globe.
Unix-type operating system originally created by Linus Torvalds with the assistance of developers around the world. Developed under the GNU General Public License , the source code for Linux is freely available to everyone.

Command:

cd	mkdir	kill	pico	make
pwd	locate	who	nano	finger
cp	rm	man	more	group
cat	su	passwd	touch	tail
me	tar	ls	chmod	adduser

LINUX
-Red Hat
-Fedora
-Centos
-Suse Linux

Posted at 09:48 pm by freedom1021
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Tuesday, November 21, 2006

SUBNETING

SUBNET - An interconnected, but independent segment of a network that is identified by its Internet Protocol (IP) address.
A portion of a network, which may be a physically independent network, which shares a network address with other portions of the network and is distinguished by a subnet number. A subnet is to a network what a network is to an internet.
A portion of a network that shares a common address component. On TCP/IP networks, subnets are defined as all devices whose IP addresses have the same prefix. For example, all devices with IP addresses that start with 100.100.100. would be part of the same subnet. Dividing a network into subnets is useful for both security and performance reasons. IP networks are divided using a subnet mask.

SUBNET MASK - The subnet mask is used to determine where the network number in an IP address ends and the node number in an IP address begins. A node is anything on a network that needs an IP address to communicate (a PC, server, router, etc).
A mask used to determine what subnet an IP address belongs to. An IP address has two components, the network address and the host address. For example, consider the IP address 150.215.017.009. Assuming this is part of a Class B network, the first two numbers (150.215) represent the Class B network address, and the second two numbers (017.009) identify a particular host on this network.

CLASS OF SUBNET

CLASS A - 255. 0 . 0 . 0 < 0 - 127 >
CLASS B - 255.255. 0 . 0 < 128 - 191 >
CLASS C - 255.255.255. 0 < 192 - 223 >

Posted at 07:04 pm by freedom1021
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Monday, November 20, 2006

SOFTWARE

IP COP
(Based on Linux)

IPCop Firewall is a GPL branch off from SmoothWall. IPCop offers the critical functionality of an expensive network appliance using stock, or even obsolete, hardware and OpenSource Software. All the functionality can be managed from a simple to use web interface, even updates and patches can be installed using a web browser. IPCop works with most home networks and small office networks, dial up modems, cable modems, ADSL, Leased lines and ISDN. It also lets several PCs share connections to the internet. If you have an always on connection you can use IPCop to protect your web and email servers. IPCop also has remote management meaning you can securely update and reconfigure your IPCop firewall from anywhere.