Network types

  "A computer network is a collection of two or more computers linked together for the purposes of sharing information, and resources, among other things." Wikipedia

Now that we already got the network definition it is important for you to know the primary types of networks.

Bus network layout

 Bus topology.

 A bus network is a network topology in wich every single client (device) connected to it share a common cable and information is sent through the cable to every client but only the one who need it will use it.

Advantages:

• Its cost effective because a single cable is used
• It can be very easy an fast to install.

Disadvantages:

•  If there is a problem with the cable the entire network comes down
• It has a slower data transfer rate than other topologies

 

 

Ring network layout

Ring topology

A ring network is a network topology in wich every node is connected with two other nodes. In this topology each client acts as a repeater and information is sent in this way so that the signal arrived its destination strong. 

Advantages:

• Performs better than bus topologyunder heavy network load
• Does not require a special node to manage connectivity between clients

                                                          Disadvantages:

• A malfunctioning workstation can create problem for the entire network.
• Delay is increased when the network gets bigger.

                                                       Star topology

Star network layout

A star network topology is one in wich everybody is connected to a switch,hub or another computer and it manages communication between clients.

Advantages:

• It is very easy to expand this networks.
• Connecting and disconnecting devices does not affect the network.

Disadvantages:

• If the central hub or server fails the whole network will be down.

    Mesh topology 

  

Mesh network layout

A mesh network is one in wich every node transmit and recieves his own data and also

collaborate with other ones to propagate data in the network.

 

Advantages:

• Alternate paths exist if there is a failure.
• no central server or hub is needed.

Disadvantages:

• Complex setup.
• Not cost effective because many cables are used.

SJ RIP

"Again, you can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life".- Steve Jobs

Steve Jobs was a innovator. The things he did at apple are really
amazing and many experts agree that his presentations always
boosted their products popularity.
He always amazed the audience and make points clear and interesting.
Many people try to copy him but most of the time
they failed because they do something wrong or just is the fact that they do not
have Steve's charisma.

Computer Security

Here is a link http://prezi.com/kq6ekt8lo0n0/computer-security/ for the presentation I made using Prezi about computer security.

Apps classification

http://www.mindomo.com/view.htm?m=75223b093b1a4cb9a031ad80b2c4d07b

IT policies

•  Before users have the privilege of opening sensitive information  they must get permission from the administrator. 
• Every computer must have antivirus software that is already approved by the IT department and must be set up to auto update daily.
• Security Patches should be installed as soon as they are available for download.
• Computers should be set up to lock automatically after an inactivity period, or users must lock it to prevent unauthorized handling of sensitive data
• Every user must classify its data from A to D (A is the most sensitive)
• Password should be changed after a certain period of time ( from 2 to 6 months) 
• Passwords should be secure (combination of alphanumeric keys and symbols)
• Malware infected devices must be disconnected from the network.
• Only handle sensitive information on mobile devices if it is encrypted.
• It´s a must to notify the IT department if your mobile device is stolen or lost.
  

Google Operators

Must people have not realized yet that using some commands and characters, they can improve their searches done with Google.
Every operator used to fine tune your search must be surrounded by spaces.If this is not done Google will not search for what you are looking for but will search for pages containing all those words.

I will explain in this post the purpose of the following operators:

•  +

 The plus (+) operator is usedto force Google include a term to search for.
Ex: Selassie +Jah will find all the pages wich talk about Haile Selassie wich contain the term Jah

•  -

The minus (-) operator will force Google to search results without a word
Ex: Ecuador -Correa will search for every page related to Ecuador without the word Correa

The OR operator will search for one term or the other one.
Ex: Ecuador OR Peru will search for pages containing the word Ecuador or Peru

•  allintext 

The allintext operator will force google to look for results not in the page´s tittle
Ex: allintext paintball will search for every page that contains paintball somewhere on its content.

•  define 

The define operator searches for dicctionary definitions
Ex: define bunker will search for the word bunker definitions

•  site:

The site: operator forces google to search the query words on a specific page
Ex: site:www.4shared.com Wiz Khalifa will search for every item containing Wiz Khalifa on www.4shared.com

 

Quotes

  "The profits are in the computers themselves, not this software stuff ".-IBM Executive

This quote makes us know that in the past no one would imagine getting rich from selling software. Today´s wealthiest man on earth made his fortune with it. So everyone knows that you can take huge profits from software and that the IBM Executive who´s this quote is from was completely wrong.

 "Good artists copy, great artists steal".-Steve Jobs

When Steve Jobs said this he was trying to say that if you want to be great you got to innovate something.
Because you can do a good thing copying from someone but everybody would know how you did it. If you steal someones work and present it as yours everybody will recognize it as your work.

"Steve Wozniak: Where's your beard? Steve Jobs: In the bathroom sink. I shaved it off. Steve Wozniak: Well, how come? Steve Jobs: 'Cause banks don't like beards."

This conversation between Wozniak and Jobs was after Steve went into several banks to get a loan.
All of them rejected it because of his hippy appereance so when he realized that decided that shaving his beard would help him to get what he want. Wozniak was shocked when he saw Steve without his bear but
in the end it actually worked. This proves that your appereance has a lot to do with success.

" Bill Gates: Now, we know that IBM has set up this place to complete head-on with Apple, and that you're gearing up to come out with a personal computer that will wipe them out. So we can get you an operating system. IBM executive: What kind of operating system? Bill Gates: It's called DOS. Ballmer (narrating): This is amazing. Not just amazing, it's historic. It should be taught in all the history books. Hung and framed in the National Gallery or something, because this is the instant of creation of one of the greatest fortunes in the history of the world. I mean, Bill Gates is the richest guy in the world because of what started in this room. And you wanna know what else? It wasn't exactly smoke and mirrors, but we didn't have anything! I mean, not a damn thing! Here we were, this two-bit little outfit, telling IBM we had the answer to their problems. The DOS? The Disk Operating System? To make all those zillion IBM computers compute? We didn't remotely own anything like what Bill was selling them. Nada. Zip"

At this time Bill went into an IBM office and explain the DOS (Disk Operating System) and how it will make work IBM computers better than apple ones. At this time Gates was making the deal which lead him to his inmense fortune. The only problem was that at that time they had nothing just an idea but they presented it so well that IBM executives actually believed them.

 "Arlene: Steve, why do you care what I call the baby? Steve Jobs: Because I don't want the baby named Rainbow! Or Orisha, or Ravi Shankar, or any other name like that."

This was when Steve went into Arlene´s house months after denying his son. He persuaded her to name the baby as he wanted but at a point she got mad and told him that why does he care if he didn´t accepted it first. Then he makes it clear that he cared because he actually didn´t want the baby to be a hippy and wanted good things for her.

 "Bill Gates: I don't understand - how does the hardware handle the mouse/cursor display? Gilmore: No, it's all right here in the software... Steve Jobs: Enough! [angrily mashes button, closing the Macintosh display] Gilmore: Sorry, Steve. Steve Jobs: There's no use torturing our guests with what they can't have"