1.3 Networks Flashcards
What does the DNS do?
Converts domain names into IP addresses for routers
What is layering?
Divides the complex task of networking into:
- SMALLER
- SIMPLER
tasks that WORK WELL with each other
(responsibility)
Hardware and software?
They have a DEFINED responsibility
What does each layer do?
Provide a service to the LAYER ABOVE IT
Advantages of layering:
- Reduces the complexity of the problem into manageable sub-problems
- Devices can be manufactured to operate at a particular layer
- Products from different vendors will work together
LAYER 4?
Browser using HTTPS
LAYER 3?
-TCP
-Error handling
LAYER 2?
IP rating
LAYER 1?
MAC
Frames (sent over fibre optic)
What are the differences between a LAN and a WAN?
LAN:
- Small geographical area
- Hardware is owned by the organisation using it
- LANs are wired with UTP cable, fibre optic or wireless using Wi-Fi
Disadvantages of networking:
- Increased security risks to data
- Malware and viruses spread very easily between computers
- Computer may be slower if there is a lot of data travelling on the network
What is bandwidth?
The amount of data that can be SENT and RECEIVED successfully in a given time
Do wired or wireless connections have a higher bandwidth?
Wired
Do fibre optic or copper cables have a higher bandwidth?
Fibre optic
What does latency mean?
The delay from transmitting data to receiving it