Unit 1 - LO2 Understanding Computer Software

Question 1

TCP/ IP

Answer 1

. Controls data traffic on the internet
. TCP splits data into packets
. IP sends packets to correct addresses
. TCP re-assembles packets & checks if any are missing to request re-sending

Question 2

UDP

Answer 2

. Alternative to TCP/ IP

. Doesn’t check for missing packets

Question 3

HTTP

Answer 3

. Controls transmission of webpages
. Starts with ‘request’ in browser
. Then gets ‘response’ from web server
. Finally, displays webpage in browser

Question 4

SMTP

Answer 4

. Controls sending email
. It pushes messages to email servers
. Servers ‘store & forward’ emails

Question 5

POP

Answer 5

. Controls receiving email
. It pulls messages from email servers
. Downloads them to user’s device

Question 6

FTP

Answer 6

. Controls transfer of files

. Special FTP software allows users ti upload & download from servers

Question 7

SNMP

Answer 7

. Checks devices on a network
. Used by IT technicians for network management
. Gives IT technicians lots of commands to check problems

Question 8

ICMP

Answer 8

. Checks packet delivery on a network

. Used by devices such as routers to send error messages when packets cannot be delivered