Posts Tagged ‘disables’
January 7th, 2009 | 
Author: There are two reasons why you may want to use a web proxy. The first may be to be able to browse on sites that are blocked by a content filter. You could be using a computer that does not belong to you.
The second reason is that you want to browse on a particular site without being identified. If you use a web proxy, you are by passing your own internet provider. This disables that website from collecting information from you, such as your IP address.
The IP address of the computer you are using is equivalent to the house address that you live in. What this means is that if your IP can be logged, it is possible to trace the location of the computer. All you have to do to use a web proxy is to fill in the address or url of the site you wish to browse anonymously. There is nothing to download much less install, which is because it is web based. These proxies work through your web browser.
But because you are not browsing directly; you are going through a third party to protect your identity, the route is a little longer. This means that it may take a longer time to reach that site than otherwise. Also, if many people are using the proxy site you are using, this contributes to the time delay, unless that proxy site has sufficient resources (bandwidth) to rely on.
Some web proxies are powered by the PHProxy script. The use of cookies is limited when this script is used. This makes PHProxyfast for surfing. There are proxies powered by other scripts such as the CGIProxy.
If you have to browse anonymously, choose the fastest sites that you can find. You will find a list when you click on PHProxy, and they are free to use.
Technology Advisory Board Use of Spy Gear for Nanny Cams and Hidden Cameras
Article Source: Surf Anonymously With a Web Proxy
A Layer 2 switch, which functions as a transparent bridge, offers no additional links for redundancy purposes. To add redundancy, a second switch must be added. Now two switches offer the transparent bridging function in parallel. LAN designs with redundant links introduce the possibility that frames might loop around the network forever. These looping frames would cause network performance problems.
For example, when the switches receive an unknown unicast, both will flood the frame out all their available ports, including the ports that link to the other switch, resulting in what is known as a bridging loop, as the frame is forwarded around and around between two switches. This occurs because parallel switches are unaware of each other. The Spanning-Tree Protocol (STP), which allows the redundant LAN links to be used while preventing frames from looping around the LAN indefinitely through those redundant links, was developed to overcome the possibility of bridging loops. It enables switches to become aware of each other
so that they can negotiate a loop-free path through the network. Loops are discovered before they are opened for use, and redundant links are shut down to prevent the loops from forming. STP is communicated between all connected switches on a network. Each switch executes the Spanning-Tree Algorithm (STA)
based on information received from other neighboring switches. The algorithm chooses a reference point in the network and calculates all the redundant paths to that reference point. When redundant paths are found, STA picks one path to forward frames with and disables or blocks forwarding on the other redundant paths.
STP computes a tree structure that spans all switches in a subnet or network. Redundant paths are placed in a blocking or standby state to prevent frame forwarding. The switched network is then in a loop-free condition. However, if a forwarding port fails or becomes disconnected, the STA will run again to recomputed the Spanning-Tree topology so that blocked links can be reactivated. By default, STP is enabled on all ports of a switch. STP should remain enabled in a network to prevent bridging loops from forming.
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Article Source: Free Cisco CCNA, CCNP, CCENT Tutorial on Switching, Spanning-Tree Protocol (STP