Networks Flashcards
What is a LAN?
- Local Area Network,
- A network that covers a small geographical area,
- It can be wired or wireless,
- Most homes use LAN.
What is a WAN?
- Wide Are Network,
- A network that covers a very large geographical area,
- Connection is achieved using telecommunication companies such BT or Sky,
- Is often used for joining companies.
What is a PAN?
- Personal Area Network,
- Has a very short range (10m), normally centred around a single person,
- PANs often uses common wireless technology (Bluetooth), to connect devices,
- Don’t require any additional hardware,
- An example, would a hotspot.
What are the benefits of having a network?
- Sharing files,
- You can share hardware (printers),
- You can update software on all devices at once,
- You can communicate across the network easily (email),
- Your accounts can be stored in the server, so users can log in, prevents other from entering the network.
What are the drawbacks of a network?
- They can be expensive,
- Networks can be vulnerable to hacking and malware,
- Some networks are dependant on servers or specific machines, if they go down the whole network will not operate properly,
- Difficult to manage and need employ specialist staff.
What are the advantages of using Ethernet?
- Cheap,
- Fairly easily to terminate,
- Quite long distance (100m),
- Can bend around, unlike fibre optic,
- Have decent bandwidth,
What are the advantages of using fibre optic?
- Larger bandwidth,
- longer transmission distances,
- Lighter,
- Harder to tap,
- Cheap glass can be used,
- Needs little maintenance.
What are the 4 layers in a TCP stack?
- Application layer,
- Transport layer,
- Network layer,
- Link layer.
What is a network protocol?
A set of rules followed by the network that controls the communication process.
What protocols are involved in the application layer?
- FTP
- HTTP
- HTTPS
- SMTP
- POP
- IMAP
What does FTP do (File transfer protocol)?
Controls file transfer between devices.
What does HTTP do (hypertext transfer protocol)?
Controls the accessing and receiving of web pages in the form of HTML files.
What does HTTPS do (Hypertext transfer protocol secure)?
The same as HTTP but for secure sites, for example, when doing money transactions or purchasing something.
What does SMTP do (Simple mail transfer protocol)?
Sends emails from server to server until it reaches its client.
What does POP do (Post office protocol)?
Receives the email from the sender, the contents is immediately downloaded when there is a connection between the client and the server.
