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Topic 3 (3.1 Types Of Servers (Application server (An application server…
Topic 3
3.1 Types Of Servers
Application server
An application server is a software framework that provides both facilities to create web applications and a server environment to run them.
Allows client computers application without needing local installation
This ensures same applications are available on all computers
You can also restrict access to certain applications
Database server
A database server is a computer program that provides database services to others.
This is a application server who has specific role of managing a database.
-it stored data
-analyses data
-manipulates data
Print server
In computing, a file server is a computer attached to a network that provides a location for shared disk access. e.g. shared storage of computer files
Dedicated to handling and managing printing to a printer connected to a network
It uses a print queue
-this is a area of storage where the job is stored until it is ready to be printed
Web server
A web server is a computer system that processes requests via HTTP, the basic network protocol used to distribute information on the World Wide Web.
Can be a physical server of software
Use HTTP to deliver web page content
E.g www.reddit.com is stored on reddit's web server and everytime someone wants to access the website it is sent from the server
File server
A print server is a device that connects printers to client computers over a network. Jobs are locally to accommodate the fact that work may arrive more quickly than the printer can actually handle.
Remembers the location of the file
Data can be restored if needed
Ensure only people with permission can see it
Mail server
Within Internet message handling services, a message transfer agent or mail transfer agent or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture.
Server is responsible for sending, receiving and storing emails
Server
A networked computer that is providing a specific service to other computers on the network
It can also be a software which provides a service.
There are different types of servers which have a specific purpose.
Can you explain each of the following types of servers
Hypervisor
A hypervisor or virtual machine monitor is computer software, firmware or hardware that creates and runs virtual machines.
Software sometimes referred to as virtual machine monitor
It allows multiple operating system to run on a single host system
3.2 Virtualisation
Client
Virtual machine
Run different operating systems on one client
E.g - logging onto the school network from your home computer/ using the desktop computer from an ipad
Why do you think this could be beneficial ?
-It can speed up productivity
What limitations might it cause to the hardware?
-Have to have internet connection
-Only connect one user at a time
-Might not be as easy to use.
Storage
Merging of physical storage from multiple network storage devices into what appears to be a single storage device.
Managed from a central console
Commonly used in storage area networks
Server
Making of server resources
Includes the number and of individual physical servers, processors and operating systems from server users
Server administrator uses a software application to divide one physical server into multiple isolated virtual environment
Spare the user from having from having to understand and manage complicated details of server resources
Increasing resource sharing and utilisation
Maintaining the capacity to expand later
Hypervisor makes this possible
Cloud
Is similar to virtualisation
When you save things in ‘the cloud’ they are being stored somewhere else external,and it makes them easily accessible to your from anywhere in the world
Hosted software again,easily accessible via the cloud, but isn't actually on your device.
Definition
Creating a virtual version of something.(computer generated/simulated) version of something.Digital version
Hybrid
Mixture of private cloud, public cloud and locally owned services
As an organisation activities/data requirements change, it can adjust its usage more effectively and efficiently
3.5 Business Systems
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Helpdesk
Having someone available to solve technical problems e.g technicians
Benefits
-Complex problems can be addressed and solved
Limitations
-cost of setting up in-house (staffing, hardware,software)
-cost of services from external host(third party)
-issues of availability of help desk
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3.4 Connectivity Methods
WAN (wide area network)
Leased Line:
A leased line is something that is rented for exclusive, 24/7, 7 days a week. A leased line connects two locations for private voice and/or data telecommunication service
They maintain a single open circuit at all times,as opposed to traditional telephone services that reuse the same lines for many different conversations through a process called “switching.”
ISDN:
ISDN (integrated services digital network) is a set of standards for circuit-switched transmission of data over various media, including ordinary telephone-grade copper wire.
There are two levels of service:the basic rate interface (BRI), intended for the home and small enterprise, and the primary rate interface (PRI) for larger users.
Both rates divide their capacity across a number of channels.
ADSL:
ADSL is a broadband connection which works through the copper wires of your existing phone line.
ADSL or a dedicated line, is a special high-speed, or hard-wired, connection that is permanent.
Any of these connections is always active, always ready
MAN:
A metropolitan area network (MAN) is a network that interconnects users with computer resources in a geographical area or region larger than that covered by a LAN but smaller than the area covered by a WA. The term is applied to the interconnection of networks in a city into a single larger network.
Examples of metropolitan area networks of various sizes can be found in the metropolitan areas of london, England or geneva, switzerland. Large universities also sometimes use the term to describe their networks
LAN (local area network)
Token Ring:
A token ring is a local area network in which all the computers are connected in a ring topology and pass one or more logical tokens from host to host
Only a host that holds a token can send data, and tokens are released when receipts of the data is confirmed.
Token ring networks prevent data packets from colliding on a network segment because more data can be sent by a token holder and the number of tokens available is controlled.
Ethernet cable:
An ethernet cable is the most common type of network cable used on a wired network whether at home or in any other business establishment
This cable connects wired devices together to the local network for file share and internet access
VOICE
PTSN:
The public switched telephone network (PSTN) refers to the international telephone system that uses copper wires to carry analog voice data. It consists of a connection of individual telephones that are hardwired to a public exchange.
Cellular:
Cellular data uses the same network provided by the cell towers that allow you to make phone calls.
Cellular data is available as long as you are within your carrier's coverage
Satellite:
A satellite telephone is a type of mobile phone that connects to orbiting satellites instead of terrestrial cell sites. They provide similar functionality to terrestrial mobile phones;voice,short messaging service and low-bandwidth internet access are supported through most systems.