nov 202 Flashcards
Explain how a URL is converted into an IP address (3)
URL sent to DNS // request sent to DNS for/with URL
* DNS looks up/finds to IP in its database
* DNS returns IP
* IF not found, DNS sends to higher level DNS
State three items of data that would be contained in a packet header (3)
Destination IP/address
* Sender IP/address
* Packet Number
* Packet size
* Number of packets
* Error detection method/value
Explain how defragmentation will change how the files and free space are arranged on
a hard disk (3)
Collate free space together
Collate file fragments together/contiguously
* All of file 1 will be stored consecutively
* All of file 2 will be stored consecutively
* All of file 3 will be stored consecutively
benefits of the cloud (3)
Can access files from any device
* … e.g. they can instantly access the data from laptop
and mobile phone
* Can access files from anywhere // Can access from
anywhere with access to the Internet
* Can pay for auto-backups // don’t have to backup
manually
* Security may be higher than at home
* May be free of cost
* … you do not need to buy more hardware
* Easier/quicker to share files with others
* More available storage space on her device
* Easier to increase storage capacity (not memory)
* Can be used a backup in case of data loss
drawbacks of the cloud
Cannot access files if no Internet access
* Not in control of security (bod less secure)
* …data may be hacked/stolen
* May cost monthly fee
* … which could be more long term than buying
hardware
* May not be a backup // if cloud storage fails you have
lost your data
* Data must be transferred to computer to read
* …. may be intercepted
* Connection may be slow
* … therefore takes time to upload/download
* May be issues as to who owns the data
* If stop paying / leave subscription other storage for
files needs to be found
* If login details are forgotten/lost may not have access
to files
how can ransomware be stopped?
use of antimalware
how can an SQL injection be prevented?
network forensics
