Lesson 4 Flashcards
Group of two or more devices that can communicate. In practice, a network is comprised of different computer systems connected by physical and/ or wireless connections
Network
Networking of computers helps the network users to share data files
File Sharing
Users can share devices such as printers, scanners, CD-ROM drives, hard drives etc. Without computer networks, device sharing is not possible.
Hardware Sharing
Networks allow users to communicate using e-mail, newsgroups, and video conferencing etc.
User Communication
Applications can be shared over the network, and this allows to implement client/server applications
Application Sharing
A lot of network games are available, which allow multi-users to play from different locations.
Network Gaming
Voice over Internet Protocol (IP) is a revolutionary change in telecommunication which allows to send telephone calls (voice data) using standard Internet Protocol (IP) rather than by traditional PSTN.
Voice over IP (VoIP)
Types of Networks
- Local Area Network (LAN)
- Metropolitan Area Network (MAN)
- Wide-area network (WAN)
A group of computers connected to each other in a small area such as building, office.
- The data is transferred at an extremely faster rate
- Provides higher security.
Local Area Network (LAN)
A network that covers a larger geographic area by interconnecting a different LAN to form a larger network.
- Large network that connects different organizations
- Government agencies use _______ to connect to the citizens and private industries.
Metropolitan Area Network (MAN)
A network that extends over a large geographical area such as states or countries.
- Two or more LANs connected
- Over a large geographic area
- Typically use public or leased lines
- Phone lines
- Satellite
Wide-area network (WAN)
“The Net,” is a worldwide system of computer networks – a network of networks in which users at any one computer can, if they have permission, get information from any other computer.
Internet
Use of Internet
- Communication
- Entertainment
- Online banking
- Shopping
- Sending emails
- Business promotion
- Research
- Games
Two or more computer network LANs or WAN or computer network segments are connected using devices, and they are configured by a local addressing scheme.
Internetwork
Types of Internetwork
- Intranet
- Extranet
It is an internal website that is setup internally for companies and can be accessed by employees for the purpose of standard documents or information and many items of information and data.
Intranet
Private network that uses Internet technology and the public telecommunication system to securely share part of a business’s information or operations with suppliers, vendors, partners, customers, or other businesses.
Extranet
Any company that provides individuals or organizations with Internet access.
Internet Service Provider (ISP)
The study of the arrangement or mapping of the elements (links, nodes, etc.) of a network, especially the physical (real) and logical (virtual) interconnections between nodes.
Network Topology
Types of Network Topologies
- POINT-TO-POINT
- BUS TOPOLOGY
- STAR TOPOLOGY
- RING TOPOLOGY
- MESH TOPOLOGY
- TREE TOPOLOGY
- Hybrid TOPOLOGY
The simplest topology is a permanent link between two endpoints.
POINT-TO-POINT
In local area networks where ____________ is used, each node is connected to a single cable. Each computer or server is connected to the single bus cable.
BUS TOPOLOGY
In local area networks with a __________ , each network host is connected to a central hub with a point-to-point connection. In __________ every node (computer workstation or any other peripheral) is connected to central node called hub or switch.
STAR TOPOLOGY
Is a network topology that is set up in a circular fashion in which data travels around the ring in one direction and each device on the ring acts as a repeater to keep the signal strong as it travels. Each device incorporates a receiver for the incoming signal and a transmitter to send the data on to the next device in the ring.
RING TOPOLOGY
Is a networktopologyin which devices are connected with many redundant interconnections between network nodes.
MESH TOPOLOGY
This particular type of network topology is based on a hierarchy of nodes. The highest level of any tree network consists of a single, ‘root’ node, this node connected either a single (or, more commonly, multiple) node(s) in the level below by (a) point-to-point link(s). These lower level nodes are also connected to a single or multiple nodes in the next level down.
TREE TOPOLOGY
When a topology is composed of two or more different topologies it is referred to as a ________ topology. ____________ aremost-commonly encountered in larger enterpriseswhere individual departments have network topologies that different from another topology in the organization. Connecting these topologies together will result in a ___________ .
Hybrid TOPOLOGY
