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Comp Sci - Networks - Coggle Diagram
Comp Sci - Networks
Local hosting
Local hosting is when you host a website on your own computer, to do this specialist software will be needed.
Local hosting pros: Cheaper than external hosting (no rental charge) and you have full control over your website.
Local hosting cons: Specialist skills are required, the hosting computer will always need to be turned on and available, you are responsible for technical issues, if the website becomes popular bandwidth may become an issue.
External hosting
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Pros of external hosting: You are not responsible for technical issues, security of bandwidth.
Cons of external hosting: A rental fee is demanded, if the hosting server goes down, your website will be unavailable, if the company upgrades their software, it may no longer be compatible with your code.
LAN's WAN's
LAN's (Local Area Networks) are networks that cover a small geographical area; typically under one mile. They use internal network hardware.
WAN's use external networks hardware and cover a large geographical area, they are typically made up from various LAN's.
The Cloud
Pro's
- Offers additional storage.
- Allows for the access of files wherever there is an 'internet connection'.
- Specialist skills are not needed.
- Environmentally friendly (no hardware used).
Con's
- Security is reliant on the cloud provider.
- Data confidentiality.
- A live internet connection is required.
Network Topologies
Star Topology
Pros:
- Devices can be easily added to the network.
- Minimal cabling is required.
- Typically cheaper than a mesh network.
- A failure of one device on the network does not effect the other device.
Cons:
- There is one single point of failure (typically a switch)
- If one piece of cabling fails, the connected device will be unavailable.
Mesh Topology
Pros:
- All devices are connected to eachother so there is no single point of failure.
- If one piece of cabling in the network fails, all devices will continue to work.
Cons:
- Data collisions are prominent
- Can be expensive to set up and maintain.
Network Hardware
- A router can connect several networks together
- A switch stores all the MAC addresses of the devices within a LAN.
- Wireless access points are necessary to form wireless networks.
Every piece of hardware on a network has a unique MAC address (stored in hexadecimal) stored within their NIC.
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Advantages of Networks
- Allows for the sharing of peripherals.
- Allows for communication.
- Allows for the sharing of files.
- Software can be updated on all devices at once.
- Allows for the access of files from any device on the network.
DNSystems and DNServers
A domain name system translates IP addresses to URL's and vice versa. If a request for an IP address is sent to a domain name server and it does not know the corresponding URL, it acts as a client and sends a request to another, higher up, server.