The Cloud

Anotações:

• Companies lease their computer resources from cloud vendors instead of buying their own.  Its much cheaper and information can be accessed from anywhere.

1. Elastic

   Anotações:

   • The vendors can add or remove resources depending on your needs.  You only pay for what you use.
2. Leasing
   1. IaaS Ex. EC2
   2. PaaS Ex. Azure
   3. SaaS Ex. iCloud
3. Pooled

   Anotações:

   • The same hardware and software can be shared by many clients.  They need the resources at different times like April for accountants and September for universities.
4. The Internet

   Anotações:

   • Initiated by the Department of Defense in 1969.  First network is ArpaNet.  Later CSNet, BitNet, AOL, etc.  In 1989 they could connect and form the Internet.
   1. IP Address
   2. TCP/IP
      1. Protocols
         1. FTP
         2. HTTP
         3. SMTP
   3. Network of Networks
      1. Network
         1. PAN
         2. LAN
            1. LAN Device
               1. Router
               2. Switch
               3. Access Point
            2. Protocols
               1. Ethernet/IEEE 802.3
               2. WiFi/IEEE 802.11
         3. WAN
   4. ICANN

      Anotações:

      • The Internet Corporation for Assigned Names and Numbers i
      1. Domain Names

         Anotações:

         • Kean.edu or amazon.com are domain names
         1. URL

            Anotações:

            • http://www.kean.edu/~tabraham
   5. Services
      1. WWW

         Anotações:

         • Invented by Tim Berners-Lee in 1991.  The dot com boom used the web to sell stuff.
         1. Web Servers
            1. 3 Tiers
               1. User
               2. Server
               3. Database
         2. HTML/XML
         3. Browsers
      2. Email
      3. Streaming
5. Computer Resources
   1. Hardware
      1. Storage
      2. Servers
   2. Software
      1. Application
      2. System
      3. Virtualization
   3. Database
   4. People and Procedures