data transmission issues Flashcards
1
Q
user authentication
A
- usernames and passwords authenticates users who have permission to use a network and prevents unauthorised access
2
Q
firewalls
A
- monitor traffic to prevent unauthorised access and dangerous data packets being passed into the system
3
Q
encryption
A
- data can be intercepted while being transmitted
- encryption ensures that intercepted data cant be read
- e.g. HTTPS
4
Q
VPN and security
A
- VPNs create a secure connection between remote sites and users over internet to prevent data being read
5
Q
Bandwidth and latency
A
- bandwidth; rate of data transfer over a network (bits per second)
- latency; time delay for a data packet to transfer to its destination (milliseconds)
6
Q
bandwidth and latency implications
A
- bandwidth is an important factor since it affects how long files take to download
- online gaming needs low latency because the gamer needs a fast response
- video calls need low latency and high bandwidth because you need to transfer a lot of data and a fast response
7
Q
compression
A
- it reduces file size so they can be transferred faster
- e.g. video and audio for VOIP calls
8
Q
compression; lossy and lossless
A
- lossy; data removed during compression is permanently deleted e.g. images, audio and video
- lossless; original data can be recovered when uncompressed e.g. document
9
Q
codecs
A
- a program used to compress and decompress video and audio file
- reduces the space they take up on disk and allow fast transfer
- leads to loss of quality
