Sebastian Perrier

1. LAN Local Area Network (network inside the company)
2. IP (Internet Protocol): the address or name of each participant in the network, such as PC, printers, etc.
3. Routers: link all connections and manage traffic to deliver info to each IP Address
4. Proxy Server: the gateway and firewall from LAN to the World Wide Web.

Web 1.0 = connecting information

Web 1.5 = connecting application

Web 2.0 = connecting users + collaboration + sharing (e.g. facebook, linked in, blogs, wikipedia, etc).

Enterprise 2.0 = Web 2.0 but closed inside a corporation’s environment.

1. client / server (xej. Outlook installed on PC that takes emails from server in an unknown destination).
2. 3-tier architecture (includes an application server, in which applications are installed, and then users from their pc’s access them via web; note that database software manages the database, but this database is actually stored in a disc or storage server – last image on the bottom)
3. cloud computing (is having a 3-tier architecture but with high-availability, no single point of failure; xej. all databases and applications work in teams or farms of servers, and when one of them fail, the others continue working and the user never has a problem, everything is transparent to the user’s eyes)
4. web services & SOA (now applications are being developed with open gates, to allow them to interconnect with other applications, so that they can exchange information between ERPs and CRMs, etc).

Why JAVA could become the standard programming language? Mainly because it is flexible, with a Java Virtual Machine you can develop software no matter what’s the Operating System. Furthermore, you can program in Java with objects and develop web services programs.

The main characteristics of an information technology system are:

1. Secure
2. Performance
3. Availability
4. Scalability
5. Flexibility