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A03 (Connectivity Methods (LAN: (Local Area Network)
Network or office…
A03
Connectivity Methods
LAN: (Local Area Network)
Network or office building that interconnects computers within a limited area such as a home, school, computer laboratory sources.
+Shared resources
-Network failure
WAN: (Wide Area Network)
A set of links that connect geographically remote computers and local area networks.
+Allows LAN to be connected together
-High Costs
MAN: (Metropolitan Area Network)
Small version of WAN which covers town/cities
+Less expensive
-HIgher security compared to WAN
Voice communication:
Cellular phones transmit and receive using land-based towers
+Low cost
-Can only be used near land tower areas
Satellite Communications:
Satellite phones communicate directly with a satellite orbiting Earth
+Can operate independantly
-More power is required
Simplex:
Transmission of data in one direction.A television picture from the transmitter to the receiving aerial, there is no signal back.
+Faster transmissions
-Cannot sent any transmissions
Half Duplex:
Transmission of data goes both directions, but only one direction at a time.
+Less complicated hardware
-cannot send data until it receives the data
Duplex:Transmission of data in both directions at the same time.
+No deleys
-No proper bandwith utilisation
3.2 Virualisation
Server virtualisation:
Server administrator uses a software application to divide one physical server into multiple isolated virtual environments.
+Reduced hardware costs
-Magnified physical failures
Client virtualisation:
Run different operating systems on one client. Logging onto a network from you home computer.
+Accessing your desktop from anywhere.
-It can have a high cost of implementation.
Storage virtualisation:
Merging of physical storage from multiple network storage devices into what appears to be a single storage device
+Improves storage management
-It can make upgrades challenging to process.
Cloud storage:
Cloud storage involves stashing data on hardware in a remote physical location, which can be accessed from any device via the internet.
+24/7 availability
-Network connections
Hybrid cloud storage:
Mixture of private cloud, public cloud and locally owned services.
+Applications are much faster
-Initial deploying cost of a hybrid cloud is high
Virtualisation- Server administrator uses a software application to divide one physical server into multiple isolated virtual environments.
+Reduced hardware costs
-Magnified physical failures
Client Virtualisation- Run different operating systems on one client. Logging onto a network from you home computer.
+Accessing your desktop from anywhere.
-It can have a high cost of implementation.
Storage virtualisation:
Merging of physical storage from multiple network storage devices into what appears to be a single storage device
+Improves storage management
-It can make upgrades challenging to process.
Cloud storage:
Cloud storage involves stashing data on hardware in a remote physical location, which can be accessed from any device via the internet.
+24/7 availability
-Network connections
Hybrid cloud storage:
Mixture of private cloud, public cloud and locally owned services
+Applications are much faster
-initial deploying cost of a hybrid cloud is high
3.5 Business Systems:
MIS:(Management Information System)
Information system used for decision-making, and for the coordination, control, analysis, and visualization of information in an organization.
+Increases productivity
-Enhances the quality of decision-making
CRM:(Customer Relationship Management)
Helps organisations build customer relationships and streamline processes so they can increase sales, improve customSoftware issues:er service, and increase profitability.
+It helps improve profitability
-Software Issues: limit on data storage
SOP:(Standard Operating Procedure)
Step-by-step instructions compiled by an organization to help workers carry out complex routine operations. SOPs aim to achieve efficiency, quality output and uniformity of performance, while reducing miscommunication and failure to comply with industry regulations.
+Simplify performance management
-Restriction could lead to inflexible practice and lack of motivation
HelpDesk:
The process of providing information and support relating to company information as well as information regarding the products and services of the organisation to the end users/customers.
+Enhanced efficiency
-Cost of setup is expensive
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3.1 Types of servers
A server is a computer program or a device that provides functionality for other programs or devices.
File server:
A device which controls access to separately stored files, as part of a multi-user system.
- Easy file recovery
-Large amount of network traffic
Print Server:
A device which connects printers to client computers over a network.
+Space saving
High cost
Application server:
A software framework that provides both facilities to create web applications and a server environment to run them. Also sends out patches and updates to clients
+Removes human error
-Costly
Database Server:
A server which uses a database application that provides database services to other computer programs or computers.
+Better security
-Very complex
Web Server:
A server software, or hardware dedicated to running said software, that can satisfy World Wide Web client requests.
+Can deal with high number of requests
-Servers could crash
Mail Server:
A server that handles and delivers e-mail over a network, usually over the Internet.
- Emails can be archive stored
-Require technical expertise to manage
Hypervisor:
A computer software, firmware or hardware that creates and runs virtual
Machines. Allows multiple operating systems to run a single host system
+Run different operating systems
- Can slow down performance