Before install the network

Nuttawut S.

Today, I come up with information about topology in details, so you can select which type is fit for your network. My friend already mentioned briefly about topology weeks ago.

Bus Networks

                This type of topology is the simplest. All of workstation, laptop, printer, server and other devices can be connected with a single cable. You can see with picture below

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                Advantages

                                Easy and cheap to install, because it require fewer cable

                                Additional workstations can be easily add to the network

                Disadvantages

                                The whole network will fail when the main cable fail or destroyed.

                                More workstation lead to more data collisions

                                Each workstation can see all the data, so it risk for confidential.

Ring Network   

                Each workstation connect with 2 other device to make signal turn around like a ring. The signal turn in one direction until the signal reach the destination device

.Image

                Advantages

                                The data transmission is simple as only one direction and no data colisions

                                Additional device can easily add to the network.

                Disadvantages

                                It is difficult to find the cause of problem in the network, so it may waste your time to solve.

                                Every workstation must turn on to transmit signal. This might waste energy.

Star Network

                This type is trend to be the most reliable topologies.Image

                Advantages

                                The network will not fail, if the problem is not on the server.

                                Rare data collision.

                                Good security because each workstation must go through the server.

                Disadvantages

                                The most expensive network because of the cables required.

                                This network usually requires expert to install and maintain.

                                If the server fail, ant device cannot use the network.

You can read more information about topology with my friend’s post

References

 (n.d.). Network Topologies. Retrieved from http://www.teach-ict.com/gcse_new/networks/topologies/home_topologies.htm

(n.d.). What is a Networks?. Retrieved from http://www.bbc.co.uk/schools/gcsebitesize/ict/datacomm/2networksrev1.shtml

 

 

                                   

What is LAN, WAN, MAN?

What is LAN, WAN, MAN?

Nuttawut S.

Image

 

 

                Today most people know or using internet connection, some people have question about the types of connection. Words LAN (Local Area Network), WAN (Wide Area Network) and MAN (Metropolitan Area Network) are used to call the type of network.

                LAN (Local Area Network) is describing for two or more computer connected in small or specific areas such as house, office, and campus. The number of devices (computers) in LAN network is 2 to 1000devices. LAN is the most simple network when compare to WAN and MAN. LAN also require small amount of money to spend. In addition, LAN makes few data errors. LAN can be connected with both physical device and signal devices. The disadvantages of LAN are slow speed transmission.

                WAN (Wide Area Network) can connect 2 or more computers and devices recent at distant places. WAN cannot be connected with wire, so they use something that can connect in wide area such satellite and telecommunications. The access of WAN network system is prohibited to very large company and government agencies. The simple example of WAN is telecom system.

                MAN (Metropolitan Area Network) is larger than LAN because MAN spread across a city. MAN is also transmitting faster than LAN. The common is example of MAN in Cable Television.

References

What is The Difference Between LAN, WAN And MAN?

 (2013, March 13). Sumit+. Retrieved from http://www.techstories.in/what-is-the-difference-between-lan-wan-and-man/

Types of Network((2013,November) Retrieved from http://en.kioskea.net/contents/266-types-of-networks

 

Get to Know Topology

Topology is physical network connectivity between computer among the same network.  There are 4 main types of topology

 

1. Bus Network : connect computer in the same network with series or use only one cable to connect. the pro is that with connect with one cable, there is no need switch or hub to connect that result in less complicated to connect the network. However, with single cable to all computer in the network, it make if one computer has problem it will mess the entire network.

bus'

2.Star Network : connect the computer as the network by using switch and hub as the center to connect the entire computer. this type of topology is very famous because as switch and hub used to connect the network makes no need to be careful to about if one cable has the problem, the rest still working very well. moreover, we can add more computer in the network immediately and easily.

star

3.Ring Network : connect network as the circle of the ring which will transmits data to other computer network until reach the starting one as the circle. the problem as same as bus network.

ring

4. hybrid network: combination of above network to connect in order to compensate the weakness of each network.

hybrid

4 world-class worms and viruses

computer virus is a type of malware that, when executed, replicates by inserting copies of itself (possibly modified) into other computer programs, data files, or the boot sector of the hard drive; when this replication succeeds, the affected areas are then said to be “infected”. Viruses often perform some type of harmful activity on infected hosts, such as stealing hard disk space or CPU time, accessing private information, corrupting data, displaying political or humorous messages on the user’s screen, spamming their contacts, or logging their keystrokes

These are 4 computer viruses that very famous once upon a time

1.Morris Worm (1998) is the first internet worm in the world. it was created by Robert Tappan Morris which he create this worm for study but it accidentally copy themselves and make about 60,000 computer infected

6 สุดยอดไวรัสและหนอนคอมพิวเตอร์อันตรายระดับโลก

2. ILOVEYOU (2000) it is a virus that come with e-mail with the subject named “ILOVEYOU”. When people open the mail, virus files name I-LOVE-YOU.txt will infected and make computer cannot be perform.

3. Code Red Worm (2001) this the very interest worm because normally the computer that infected by worm will have symptoms immediately, but this worm will show its power after 19 days after it infect and at that time this worm already spread all over the computer. Then, it will disappear or computer will perform normally for 7 days, then it will attack again. What an stunning and confuse worm it is.

4. Slammer (2003) it is the worm that make internet perform slower. This worm was launched first on January 25, 2003 at 05.30 am which after 30 minutes this worm infects for 75,000 computers.

25 January 2003 – 5:29 am – infected 0 computers

6 สุดยอดไวรัสและหนอนคอมพิวเตอร์อันตรายระดับโลก

25 January 2003 – 6 am – Infected 74,855 computers

6 สุดยอดไวรัสและหนอนคอมพิวเตอร์อันตรายระดับโลก

Dark side of using Social Media

In present day, people share information and communicate via social media like facebook, line, ig etc. it seems that social media help people live easily and with social media it make good chance to many things like opportunity to business or marketing with low cost compare to the past. However there is opportunity to dark side as well. This is the social media that use to promote prostitute. Whos here is the example, this is operate like social media that show people nearby who register with whos here then classify in gender to help people find new friends. In this social have, people will create profile and put something like name, ages, pictures, relationship status also some introduce. Here is the point some girls use introduction part to sell and promote prostitute obviously. Here the example of dark side of using social media; however, it not social media false but it depend on how people using it  See you next time, have a good da
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http://web.whoshere.net