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1.3 Networks and systems - Coggle Diagram
1.3 Networks and systems
1.3.1 Server types
File server
A file server is to store files so other systems can access them. This gives another level on the security on the files stored for a company. File servers will automatically back up. Using a file server will free up space for the companies desktop computers.
Print server
A print server is used to manage requests by sending documents to appropriate printers. Print servers create queues with the current requests which makes sure the printers aren't overloaded. If a printer breaks they can divert its jobs some where else.
Application server
An application server gives shared access to a application on a network. All the users on a network can be given access to applications and the company can have tiered levels of access. This simplifies updates because it only has to happen on the server.
Web server
A web server manages HTTP requests from devices on the network to display we pages on web browsers. The sever has a list of known URLS and their IP addresses. The web servers displays the response to the computer that sent the request.
Mail server
These server send and receive emails using email protocols SMTP (Safe Message Transfer Protocol) and POP (Post Office Protocol) allowing communication between other mail servers.
1.3.2 Virtualisation
basics
Storage virtualisation is when multiple servers are joined together to make a larger virtual storage device.
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Benefits and drawbacks
Benefits
It can save money in the longterm because it means that a company doesn't have to spend as much money on storage and less power consumption.
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Cloud storage
Private cloud storage is when a business sets up their own data centre that can be accessed by their employees this means the business has control over the security measures and systems. They will likely not pay people for access because it is mainly employees using it. IT WILL COST THE COMPAY A LOT OF MONEY TO SET UP
Public cloud is using a third-party provider for cloud storage over the internet like google. This is usually pay to use service but some places like google will give small amounts of storage for free. It is up to the provider to deal with security and hardware for storage.
1.3.3 Network topologies
A client server is when a server is set up in a topology at the centre and has clients sending requests it process and manages those requests and then manages responses. The network can be controlled centrally from the server and easily back up data and update software. The servers can be shared to clients. This makes this topology very scalable. There can be a lot of traffic for the server slowing down the network. If there is a fault in the server the topology goes down. Malware can spread quickly.
Peer-to-peer is where data is shared between all devices on the network this doesn't require a central server. Each computer is responsible for sending data as any other on the network. This is a simple network and requires no server. This is good for quickly sharing files. Without a dedicated server there is no central device to control security and back ups. The computers will perform worse because it is sharing data .
A bus topology is when there is a long wire with terminators on each end. Then devices are joined onto the cable packets have a destination address and go by each device until they find the right one. It is easy to attach devices to the topology. This one is quick to set up only needing a ling cable. A bus is cost effective because again it is just a long cable. This has poor security because data can be grabbed by attaching a device to the system. There are a lot of data collisions.
A ring topology is a very old system and runs by sending a token around with data and delivering it to a device before getting more data but can only carry one piece of data at a time. There are no collisions because data only goes on direction. Attaching more systems doesn't slow the network. If a system fails the network fails. The ring has to shutdown to put in a new device.
A star tropology has central node being a hub or switch a switch centre one will be able to send data directly do its intended target. A star topology has good security because data is sent straight from the switch. New systems can be connected directly. Transfer speed is usually pretty fast. If the central not stops working the network goes down.
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