MODULE 2 - PART 2 EXERCISE

TYPES OF NETWORK

LAN 

 A local area network (LAN) is a network that connects computers and other devices in a relatively small area, typically a single building or a group of buildings

WAN

A computer network that spans a relatively large geographical area. Typically, a WAN consists of two or more local-area networks (LANs)

MAN

 A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographic area or region larger than that covered by even a large local area network (LAN) but smaller than the area covered by a wide area network (WAN).

SAN

 A storage-area network (SAN) is a dedicated high-speed network (or subnetwork) that interconnects and presents shared pools of storage devices to multiple servers.

VPN

is a virtual private network which is a network that is constructed by using public wires, usually the Internet, to connect to a private network, such as a company's internal network. 

INTRANET vs EXTRANET

• Intranet - An intranet is a private network accessible only to an organization's staff.
• Extranet - An extranet is a 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

BANDWIDTH

• Bandwidth describes the maximum data transfer rate of a network or Internet connection. It measures how much data can be sent over a specific connection in a given amount of time.

NETWORKING MODELS

OSI vs TCP/IP

OSI

The Open Systems Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. 

The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols.

The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model.

TCP/IP

stand for Transmission Control Protocol/Internet Protocol. It is the most widely used communications protocol. TCP/IP prepares and forwards data packets over a network such as Ethernet.

Reference : https://www.techopedia.com/definition/24205/open-systems-interconnection-model-osi-model
http://www.webopedia.com/TERM/B/bandwidth.html