TCP/IP and OSI Model

Question 1

Which layer is the application layer and what does it do?

Answer 1

Layer 7 – is the closest to the end-user this layer is considered an applications interface to the network – not the user interface. It handles file transfer, virtual terminals, network management, flow control, error recovery, and fulfills networking requests of applications

Question 2

What protocols work at the application layer?

Answer 2

File transfer protocol – FTP 
Trivial FTP or TFTP
Simple Network Management Protocol - SNMP Simple Mail Transfer Protocol SMTP
Telnet
HTTP