DDR & DDR 2

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Laptop Keyboard Repair

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Laptop keyboard repair is one of the more common jobs performed on laptops, it's also one of the easier repairs to carry out providing the following hasn't happened. A spill of anything but water on a keyboard will 9 times out of 10 leave you in a situation that involves replacing the keyboard all together.  Keyboards are manufactured in such a way that leaves little to no room to clean out messy spills. Basically any liquid containing sugar (soft drinks, beer, wine, coffee or tea) are bad news... A couple of laptop keyboard repair do’s and don’ts in the event of a spill.. DON’T  panic. Panic makes us do stupid things, think before you react. DON’T  use a hairdryer to dry out a spill...melted keys are hard to type with. DON’T  tilt the machine upside down or on its side (if you do feel the need it's better to tilt it to the side that houses the CDROM as the CDROM area inside the machine has less components on it than the mainboard). DO  switch the machine off im...
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Media and Topologies

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NETWORK TOPOLOGIES A logical topology depicts the route the signal takes on the network. A physical topology depicts how network devices are connected physically, the cabling. The 4 diagrams below represent the four topologies: Bus - Devices in a bus topology are connected to a central cable. In this type of network, both cable ends must be terminated. A defective cable segment, and changes and additions can affect the entire network. Star - Devices in a star topology are connected through a central hub. In this type of network, new nodes can be easily added making it easy to expand. Multiple connected star networks can form a large star or hierarchical topology. Th...
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proxy server

A proxy server is a dedicated computer or a software system running on a computer that acts as an intermediary between an endpoint device, such as a computer, and another server from which a user or client is requesting a service. The proxy server may exist in the same machine as a firewall server or it may be on a separate server, which forwards requests through the firewall. An advantage of a proxy server is that its cache can serve all users. If one or more Internet sites are frequently requested, these are likely to be in the proxy's cache, which will improve user response time. A proxy can also log its interactions, which can be helpful for troubleshooting. Here’s a simple example of how proxy servers work : When a proxy server receives a request for an Internet resource (such as a Web page), it looks in its local cache of previously pages. If it finds the page, it returns it to the user without needing to forward the request to the Internet. If the page is ...
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