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I can't tell you how many times I have come across a "frozen computer" that was simply a case of an unplugged mouse or keyboard.
Always take a second to try the most obvious things first. It could save you a lot of time. Assuming everything is plugged in and properly seated, try plugging in another monitor to see if that one works; don't forget to try different power outlets as well, it isn't uncommon to blow a fuse, especially with more power hungry systems.
If the second monitor works, you are likely dealing with a bad monitor.
Unfortunately, in this case, there isn't much you can do. Most of the time, it ends up cheaper to replace the monitor altogether than to try to get it repaired. If the monitor seems to work, but the tower doesn't turn on, the first thing you'll want to check is the power supply.
A good test of this is to see if any lights turn on in the front or back of the tower. If they don't, the power supply unit PSU may be at fault. Some PSUs have a dedicated power switch, if it does, ensure that it is switched on.
Next you can open up your tower and look at the motherboard, most motherboards have a small LED light built in to show if power is running to the motherboard.
If you can't find any evidence that power is properly running to the motherboard, you can either try using a PSU tester, or a replacement PSU. It is not uncommon for PSUs to go out, so this is most likely the problem and a replacement is in order.
Never try to open a PSU and try to repair it yourself, this is extremely dangerous; with replacement PSUs being so inexpensive, it really isn't worth the risk. If you are able to see lights turn on and power is obviously flowing to the computer system and monitor, there may be a component issue. Whenever I deal with a computer "not turning on" or freezing up, I always like to follow a path running from the wall, to the monitor, and finally to the computer itself.
One thing to note when you first turn on the computer and the power comes on, is do you hear or see anything? If you hear any beeps, that is a great way to figure out what the issue is.
Volatile means that the data stored in memory is lost when we switch off the computer or if there is a power failure. There are different types of RAM available.
Some of them are described below. The term dynamic indicates that the memory must be constantly refreshed or it loses its contents. This type of memory is more economical. The term static is derived from the fact that it does not need to be refreshed like DRAM. This type of memory is non-volatile. The information is stored permanently in such memories during manufacture.
A ROM, stores such instructions that are required to start a computer. This operation is referred to as bootstrap.
The different types of ROM are given below. The MROM cannot be programmed by the user.
EPROM is erased by exposing it to ultra-violet light for a duration of up to 40 minutes. It can be erased and reprogrammed about ten thousand times. Both erasing and programming take about 4 to 10 milliseconds. Secondary Storage External Storage Devices Floppy diskettes, hard disk, tapes and optical disks come under the category of external storage devices or ancillary storage devices.
These devices are very sensitive to environmental conditions humidity and temperature as well as to external magnetic fields and need to be stored carefully. Information on a floppy disk is recorded in the magnetized states of particles of iron oxides evenly placed upon concentric circles known as tracks.
It contains a stack of metal platters, each coated with iron oxide, that spin on a spindle and the entire unit is encased in a sealed chamber. C Magnetic Tape This is plastic tape, usually made of Mylar that is coated with iron oxide, thereby enabling the introduction writing ; retention memory and reading of magnetically recorded information.
The best use of tape storage is for data that you do not use very often. If a peripheral device is disconnected, the computer will still be able to work; only functions performed by this peripheral device will not be available.
Here are the most used types of peripheral devices: A Keyboard The most common and very popular input device which helps in inputting data to the computer.
It consists of keys that are capable of inputting alphabets, numbers and special characters. At one time making sure that a network card matched the network medium was a really big deal, because there were a large number of competing standards in existence. For example, before you built a network and started downloading network cards and cabling, you had to decide if you were going to use Ethernet, coaxal Ethernet, Token Ring, Arcnet, or one of the other networking standards of the time.
Each networking technology had its strengths and weaknesses, and it was important to figure out which one was the most appropriate for your organization. Today, most of the networking technologies that I mentioned above are quickly becoming extinct. Pretty much the only type of wired network used by small and medium sized businesses is Ethernet. You can see an example of an Ethernet network card, shown in Figure A. Figure A: This is what an Ethernet card looks like Modern Ethernet networks use twisted pair cabling containing eight wires.
These wires are arranged in a special order, and an RJ connecter is crimped onto the end of the cable. Figure B: This is an Ethernet cable with an RJ connector installed Hubs and Switches As you can see, computers use network cards to send and receive data.
The data is transmitted over Ethernet cables. In this day and age of high speed Internet access being almost universally available, you tend to hear the term broadband thrown around a lot. Broadband is a type of network in which data is sent and received across the same wire. In contrast, Ethernet uses Baseband communications. Baseband uses separate wires for sending and receiving data. What this means is that if one PC is sending data across a particular wire within the Ethernet cable, then the PC that is receiving the data needs to have the wire redirected to its receiving port.
You can actually network two PCs together in this way. You can create what is known as a cross over cable. A cross over cable is simply a network cable that has the sending and receiving wires reversed at one end, so that two PCs can be linked directly together. The problem with using a cross over cable to build a network is that the network will be limited to using no more and no less than two PCs.
Rather than using a cross over cable, most networks use normal Ethernet cables that do not have the sending and receiving wires reversed at one end. Of course the sending and receiving wires have to be reversed at some point in order for communications to succeed.