Thursday, 22 March 2012

21st Mac 2012

Time flies and it's our 3rd tutorial for this course~
Dr. Dayang announced that we'll having our mid term test on the 31st Mac and this really alarmed me that it's the time that I should be started to focus more on my study!!!
it's time!!!

Okay,back to our topic,today's class lesson is "The Introduction to Networking".
For your information, the idea of networking is as old as telecommunication~(wow!!)
Computer networking is connecting a computer with another computer or other devices to enable them to communicate with each other. A collection of computer and other hardware devices that are connected together to share hardware, software, and data as well as to communicate with one another.
Computer networking can be categorized into:

There are several types of LAN based on the geographic coverage,such as
Wireless Standard Primer
  • LAN (Local Area Network)
  • WAN (Wide Area Network)
  • MAN (Metropolitan Area Network)
  • PAN (Personal Area Network)

Besides that, according to what Dr. Dayang taught, the network are usually categorized and classified by using 3 properties, which are
  • Topology (geometric arrangement of network)
  • Protocol (common set of rules and signals the computer on the network use to communicate)
  • Architecture (peer to peer/ client/ server)

At the end of Dr. Dayang's lesson, she had instructed us to find the differences of Bridge, Router, Switche, and Hub. Hereby, I would like to share my results after searching the information via internet.

In an internet network there are 4 devices that from the outside look very similar.
A bridge goes one step up on a hub in that it looks at the destination of the packet before sending. If the destination address is not on the other side of the bridge it will not transmit the data. A bridge only has one incoming and one outgoing port.

A router is similar in a switch in that it forwards packets based on address. But, instead of the MAC address that a switch uses, a router can use the IP address. This allows the network to go across different protocols.The most common home use for routers is to share a broadband internet connection. The router has a public IP address and that address is shared with the network. When data comes through the router it is forwarded to the correct computer.This comparison to email gets a little off base. This would be similar to the router being able to receive a packet as email and sending it to the user as a fax.
A switch steps up on a bridge in that it has multiple ports. When a packet comes through a switch it is read to determine which computer to send the data to. This leads to increased efficiency in that packets are not going to computers that do not require them. Now the email analogy has multiple people able to send email to multiple users. The switch can decide where to send the mail based on the address. Most large networks use switches rather than hubs to connect computers within the same subnet.
A hub is the simplest of these devices. Any data packet coming from one port is sent to all other ports. It is then up to the receiving computer to decide if the packet is for it. Imagine packets going through a hub as messages going into a mailing list. The mail is sent out to everyone and it is up to the receiving party to decide if it is of interest. The biggest problem with hubs is their simplicity. Since every packet is sent out to every computer on the network, there is a lot of wasted transmission. This means that the network can easily become bogged down. Hubs are typically used on small networks where the amount of data going across the network is never very high.

After the lesson, it's the time that the first presentation group to present their slides on the topic of "Email Application". I personally quite familiar with all the procedures that our friends presented since I'm already a hotmail user when I was in primary school.

Lastly, I would like to share a video about the ways to master online career networking

love Alison

Wednesday, 7 March 2012

7th March 2012

Time really flies and it's already another brand new week to post our reflections~
Well, before we began our class this morning, we had a shock that Dr. Dayang announced that we should start our class presentation by today and this really frightened me up (although i'm in the last group =p).

Well, since all of us didn't prepare anything and everyone was in the confusing mode on, we were given another 1 week to prepare the presentation (hoooray!!!).


Okay, back to our topic, in today's lesson, we got to know what actually DATA COMMUNICATION is.

Well, Data Communication is the collection and distribution of the electronic representation of information from and to remote facilities by means of electrical transmission system such as telephone lines, satellites or coaxial cable.

Computers nowadays play an important role in life that it's a must for everyone to have their own computer or laptop. Computers are now used in every walk of life either at home, schools, and universities.

Besides that, we also learnt about the types of signals which are the info typed data that needs to be converted into signals. There are 2 types of signal and they are:

Moreover, we also learnt about what is Binary Digital, Synchronous Transmission, Asynchronous Transmission, Data FLOW, Simplex, Half-Duplex, Full Duplex, and lastly of course Multiplexing.

Among all of these sub-topic, I personally get more interested with the Half-Duplex that although it can deliver messages in 2 directions but NEVER at the same time!!!! One of the most representative example is Walkie-Talkie~


Lastly, I would like to present....
A video that talks about the comparisons between Full Duplex and Half-Duplex......
Hope you enjoy the show~~


Love, Alison