CloudThe elastic leasing of pooled conputer resources over the internet
ElasticThe computing resources leased can be decreased/increased dynamically, programmatically, in a short span of time and that organization pay for just the resources that they use
PooledMany different organizations use the same physical hardware, they share that hardware through virtualization
Economies of scaleThis principle says that the average cost of production decreases as the size of the operation increases
NetworkCollection of computers that communicate with one another over transmission lines or wirelessly
Local area network (LAN)Connects computers that reside in a single geographical location on the premises of the company that operates the LAN
Wide area network (WAN)Connects computers at different geographic locations
InternetNetwork of networks… Connect LANs WANs and other internets
The INternetThe collection of networks that you use when you send an email or access a web site
IntranetPrivate Internet used exclusively within an organization
ProtocolA set of rules and data structures for organizing communication
Small office or a home office (SOHO)Such LANs have fewer than a dozen or so computers and printers
IEEE 802. 3 protocol/EthernetUsed for wired LAN connections/ specifies hardware characteristics
10/100/1000 ethernetConform to the 802. 3 specification and allow for transmission at a rate of 10, 100, or 1000 Mbps
Wireless LAN connections use the IEEE 802. 11 protocol
BluetoothDesigned for transmitting data over short distances, replacing cables.
Internet service provider (ISP)3 important functions
1. Provides you with a legitimate Internet address.
2. Serves as your gateway to the Internet
3. ISPs pay for the Internet
Digital subscriber line (DSL)Operates on the same lines as voice telephones but operates so it doesn’t interfere with voice telephone service
Cable linesType of WAN
Provide high speed data transmission using cable tv lines
HopMove from one network to another
CarriersLarge telecommunication providers
Net neutrality principleAll data is tested equally
IP addressInternet address, a number that identifies a particular device
Public IP addressIdentify a particular device on the public internet
Private IP addressesIdentify a particular device on a private network typically a LAN
IPv4 formatMost common.
Four decimal dotted notation
IPv6 formatLonger format
Domain nameWorldwide unique name that is affiliated with a public IP address
URL – uniform resource locatorAn address on the Internet.
Three tier architectureDesign of user computers and servers that consist of three categories or tiers.
User tierConsists of computers, phones and other mobile devices that have browsers that request and process web pages
Server tierComputers that run web servers and process application programs
Database tierConsists of computers that run a DBMS that processes requests to retrieve and store data
Web pageDocument that is coded in, usually html
Web serversPrograms that run on a server tier computer and manage traffic by sending and receiving web pages to and from clients
Commerce serverApplication program that runs on a server tier computer
Service oriented architecture (SOA)According to the philosophy, all the interactions among computing devices are defined as services in a formal, standardized way
hypertext transfer protocol (http)Protocol used between browsers and web servers
SMTPUsed for email transmissions
FtpUsed to move files over the Internet
Software as a service (SaaS)Provides hardware infrastructure and an operating system and application programs as well.
platform as a service (PaaS)Vendors provide hosted computers, and operating system and possibly a DBMS
Infrastructure as a service (IaaS)Cloud hosting of a bare server computer or data storage
Content delivery network (CDN)System of hardware and software that stores user data in many different geographical locations and makes those data available on demand
Virtual private network (VPN)Used the Internet to create the appearance of private, secure connections
Connection is called a tunnel
Private cloudCloud owned and operated by an organization for its own benefit
Virtual private cloud (VPC)Subset of a public cloud that has a highly restricted, secure access.
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