Router - Transmitting Packets by Michael Russell
In a previous article we discussed the basics of what a router did. We're now going to get into a more detailed, and yes technical, explanation of how packets are transmitted as well as a few other tech specs of how routers work. So put on your learning caps because you're in for a real mind... Each packet contains quite a bit of information including the sender's address, the receiver's address and of course the information being sent which includes the order of each packet how it should be put back together so that the end user can make sense of the data.

What is a Firewall ? by Benjamin Hargis
Simply put it acts as a barrier between your computer and the internet. To protect you from crackers, hackers and malware. If your running DSL or a cable modem you should employ a firewall, as having a direct connection to the Internet can make you a target to attack. ... Statefull packet inspection- looks up criteria against a database of trusted information. ... Proxy Service- Information from the Internet is grabbed by the firewall and delivered to the requesting service thru the proxy. ... Packet Filtering- Packets are analyzed against filters in the firewall rulesets.

What is a Hardware Firewall and Which Hardware Firewall is Best? by Debbie Jacobsen
If you have more than three computers in your home or business that share the same internet connection, a hardware firewall is something you may want to consider. A hardware firewall is a device that sits in between the internet and your network, protecting all computers on the inside from... It checks to see where the packet came from, if it was sent as a response to a user request for information, if it just "appeared" out of nowhere, etc... ... Another technique that is often used with hardware firewalls is called Stateful Packet Inspection, also known as SPI.

ADSL Routers by Ross Bainbridge
A circuit in an ADSL is defined by endpoints. A route is defined as the path that is taken between these endpoints. Switching is the process of making a path available for use by a circuit. A router shifts data from one route to another. It also allows for access to various fixed or temporary... This information can be in the form of full origination and destination information for each packet, or a special identification set up for a particular origination or destination on a temporary basis. ... Routers must essentially contain the address information that is associated with each...

Firewall As Security Wall For Computer Protection by Sam Mike
Firewalls are security programs for computers that work same as that of physical firewalls protecting them from external hazards things. If an organization is using a network based environment then there is more chance of getting harm then a stand alone computer. ... -Assessment of Packets Content Not whole of the content is checked by firewall programs but certain keywords are matched to the defined database information in the firewall. ... All the information coming from the internet resource is first checked by firewall then transmitted to the requested system.

Router - Tracing Your Packets by Michael Russell
Few people will really care about the path that your packet takes when sending a message, but if you're one of those high tech egg heads then this article may be of great interest to you. It can become very addictive so proceed with caution. If you're using a Microsoft Windows based operation... The next piece of information on each line is the actual name of the router the information went through. ... The amount of time it takes information to get from one router to another varies depending on how much traffic there is on that route at the time.

CIsco CCNP / BSCI Exam Tutorial: Introduction To Policy Routing by Chris Bryant
Policy routing is a major topic on your BSCI exam, and you'll find quite a bit of policy routing going on in today's production networks. But what exactly is policy routing? Policy-based routing, generally referred to as "policy routing", is the use of route maps to determine the path a packet... as-path Prepend string for a BGP AS-path attribute automatic-tag Automatically compute TAG value comm-list set BGP community list (for deletion) community BGP community attribute dampening Set BGP route flap dampening parameters default Set default information extcommunity BGP extended...

Understanding the Components of a Home Network by Jeff Heaton
Home networks are becoming more common. People want to be able to share a single broadband Internet connection to several computers in the house. There are many different devices that you can use to make up your home network. If you have never heard network terminology device names like router,... A switch will only send Ethernet packets to the computer that the packet was intended for. ... Each computer will determine if the packet was really intended for it, and filter out packets that were intended for other computers.

Denial Of Service Attack by Edwin Gonzalez
A Distributed Denial of Service (DDoS) is an attack on a network which is designed to bring it to a halt. This is done by sending useless traffic to a specific service/port on a server. The amount of traffic sent would overwhelm the service, so that legitimate traffic would be dropped or ignored. ... If the packet's source IP address originates inside the subnet that the router serves, then the packet is forwarded. ... In case of an attack you would receive and email with IP information; remember the IP information is usually spoofed.

CD R Copiers by Kent Pinkerton
CD-R stands for CD-Recordable. Recordable CDs can be used once for recording data. Machines used to copy CD-Rs are called as CD-R copiers or CD-R duplicators. CD-Rs consist of four layers-a label, a reflective layer, a dye-coated layer and a protective polycarbonate layer. ... The third method is 'packet copying', which allows a packet of data to be copied at a time. ... When a CD-R is introduced in the copier, the information is read from the master CD's pits and hills. ... The most efficient method of copying information onto a blank CD-R is the disk at once method.