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| unprocessed items, raw facts |
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| collection of data organized in a manner that allows access, retrieval, and use of data |
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| allows users to pick and choose to obtain information |
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| stores information about both the data and how it is related |
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| data - tables (data files) - records (rows) - fields (columns) - byte - Bit |
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| specifies the kind of data a field can contain and how the field is used. Ex: datatype is text, so it can only contain text/numeric characters |
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| uniquely identifies each record in the table |
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| a column/group of columns in a relational database table that provides a link between data in two tables |
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| between two database tables when one table has a foreign key that references the primary key of another table |
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| requires every value of on attribute (Column) of a relation (table) to exist as a value of another attribute (column) in a different or the same relation (Table) |
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| entity relationship diagram (ERD) data model |
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| shows what will be in the database, relationships between entites |
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| something we want to track. EX: peoples names, task name |
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| describes something in ways of elements, fields, files |
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a collection of computers and devices connected together via communications devices and transmission media.
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any material substance that carries an electronic signal to support communications between a sending and receiving device
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| Network Protocols and why are they needed |
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| sets of rules for exchanging information. Without protocols computers couldn't communicated efficiently over the internet |
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| signals are guided along a solid medium |
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| Signals are broadcast over airwaves as a form of electromagnetic radiation |
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is a network that connects computers and devices in a limited geographical area.
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is a network that covers a large geographical area
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| is a larger network that usually spans several buildings in the same city or town |
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the design of communication network. (Answer question on how data flows in a network)
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sets rules of communication for network and provides every client with an address so others can find it on the network
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an network on which users access each other’s hard disks and exchange files over the network
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the study of the arrangement or mapping of the elements (links, nodes, etc.) of a network.
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workstations/devices are looped together.
Pros: organized
Cons: If one goes down they all go down |
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An arrangement in a local area network (LAN) in which each node (workstation or other device) is connected to a main cable or link called the bus. connected to a common backbone.
Pros: cheap to setup
Cons: security isn't good |
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| joins multiple star topologies together onto a bus |
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| every node (computer workstation or any other peripheral) is connected to a central node. |
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| a network where employees can create content, communicate, collaborate, get stuff done, and develop the company culture. |
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| It connects parts of the intranets of different organizations and allows secure communications among business partners |
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1. Provide a legitimate Internet address
2. Gateway to the Internet
3. Pay for the Internet by collecting money from customers and paying access fees and other charges to telecom
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the internet is built by T1 carriers. ex: AT&T, Verizon, etc
Cost about $1,000 a month |
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| expensive. cost$3,000 a month. used to build the core of a business/headquarters. |
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Definition
has no fixed path is created between the communicating devices
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sets up a circuit between the sender and receiver before any communications can occur
i.e. phone call
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| is a telecommunications hardware device that converts communications signals so they can be transmitted over the communication media |
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connects multiple computers or other routers together and transmits data to its correct destination on a network
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A hub or switch connects several devices in a network together
� |
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| network interface card (NIC) |
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Definition
enables a computer or device to access a network
EX: |
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The Domain Name System (DNS)
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Converts IP addresses to domain names,
Hierarchical structure,
Top-level domains
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| 32 - Bit. IP addresses are running out |
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| 128 - Bit. The internet is moving towards this. provides for many more devices. |
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Identify a particular device on a private network (www.jmu.edu/parking)
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Identify a particular device on public Internet,
Public IP addresses must be unique, worldwide (www.jmu.edu)
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refers to the rate at which data is exchanged
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is a network that connects a user’s computer (a client) to one or more host computers (servers)
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| is a collection of forms, reports, queries, and programs that process a database |
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| describes the data and relationships that will be stored in a database |
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| operates like WiFi, only over greater distances and at faster transmission speeds |
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| is the standard page description language for Web pages |
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| A markup language designed to transport and store data on the Web |
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| describes the data and relationships that will be stored in a database |
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| is the standard page description language for web pages |
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Term
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Definition
| is a markup language designed to transport and store data on the web |
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Definition
| operates like WiFi, only over greater distances and at faster transmission speeds |
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Definition
| consists of server and client software, the HTTP, standards, and markup languages that combine to deliver information and services over the internet. |
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Definition
Ancestor of the Internet,
Project started by the U.S. Department of Defense (DoD) in 1969
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Definition
the Web as a computing platform that supports software applications and the sharing of information among users
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Term
| File Transfer Protocol (FTP) |
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Definition
supports file transfers between a host and a remote computer
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| VPN (virtual private network) |
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Definition
a secure connection between two points on the Internet
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