Today we talked about networking. We discussed the differences of the LAN (Local Area Network) and the WAN (Wide Area Network). A LAN is what computers have connected within your home or organization. A WAN is two or more LANs connected by routers to communicate and share resources. We then started to discuss topologies. The topologies that were mentioned were the star, bus, ring, mesh and point-multipoint. Three of these we talked about. We talked about the Star topology, which are computers that are all connected to a switch. That is part of the LAN technology and the star is the most popular today. The next was the bus topology. This is a topology that is no longer used but is good to know about. On a bus, multiple computers are connected on the same coaxial cable, the components that help make this up were the T-connectors, BNC connectors, repeaters and vampire taps. The last was the ring topology. This topology was introduced by IBM. Here the computers are connected using STP (shielded Twisted Pair) and the computer communicates by the use of a token. When the computer has a token then it is the one that can “speak” in a sense. Afterwards we talked about the OSI model. This model is the foundation for networking. It consists of seven layers and they are as followed:
Layer
7- Application- Service
6 -Presentation - Decryption
5 -Session - Point to point
4 -Transport -Segmentation
3 -Network - Router
2 -Data-Link -NIC
1 -Physical -Switch
Tuesday, April 27, 2010
Wednesday, March 10, 2010
C# class 3/8/10
Today we talked about the midterm and worked on a program that my brother and I were having problems with. Our biggest problem was not the code but our logic. Tip: Remember when you are programming, you compiler will only read the syntax to make sure it is OK. It is still up to you to make sure the logic is in place. When I say logic, check the sequence of your program and see if it logically follows right.
Sunday, March 7, 2010
Week 3 A+ homework: How to check memory on your computer
One way to check memory on your computer is by going to the "Control Panel" as seen below:
Then click on "Systems and Maintenance":
Then click on "Systems":
Another way you can do this is by going to your "Utilities Setup". To get here you have to reboot your computer. When the screen first comes on then hit the F2 button and a blue screen should pop up showing you some information about your computer and your memory will be one of them.
The sure way to know what your system has and can upgrade to is to keep your paperwork when you purchased it. If you do not have that then you can get on the Internet and type in the brand and model of your computer and you should get the results.
My computer can expand up to a 4 GB RAM, the reason that this information is important is because if you want to up grade you need to know what you already have to do that. But remember DO NOT exceed the recommended max memory of your operating system.
Then click on "Systems and Maintenance":
Then click on "Systems":
Another way you can do this is by going to your "Utilities Setup". To get here you have to reboot your computer. When the screen first comes on then hit the F2 button and a blue screen should pop up showing you some information about your computer and your memory will be one of them.
The sure way to know what your system has and can upgrade to is to keep your paperwork when you purchased it. If you do not have that then you can get on the Internet and type in the brand and model of your computer and you should get the results.
My computer can expand up to a 4 GB RAM, the reason that this information is important is because if you want to up grade you need to know what you already have to do that. But remember DO NOT exceed the recommended max memory of your operating system.
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