application layer - chapter 3 Flashcards
1
Q
Name 5 of the protocols in application layer
A
- SMTP
- DNS
- FTP
- TELNET
- HTTP
2
Q
Describe HTTP & port number
A
- Hypertext Transfer Protocol
- port: 80
- function . fetch html files from server
- how: client - initiates request
server - receives request
- fetch files
- response request
3
Q
Describe SMTP & port number
A
- Simple Mail Transfer Protocol
- port: 25
- function: transfer & receive emails
- how:
. clients initiates connection with SMTP
. SMTP server safe keep email when received every copies
. SMTP server then transfer email to host once establish a connection
4
Q
Describe FTP & Port number
A
- File Transfer Protocol
- port: 21
- function: file transfer
- how:
. client initiates connection
. server receives connection
. server then transfer file to client
5
Q
Describe TELNET & port number
A
- port: 23
- function: allow configuration of routers, switches & etc (remote command line terminals)
- how:
. client echoes characters
. server echoes whole sentence once received whole line of characters.
6
Q
Describe DNS & port number
A
- Domain Name System
- port: 53
- function: translate host name into ip
- how
. hierarchy based system
. local - root - tld - organization (imagine searching words in a dictionary)