1. LO1 Know types of Network Systems and Protocols

2. Application Layer Protocols

3. Objectives By the end of this session you should be able to: – Describe the function of the application layer – Describe the common application layer protocols – Understand the function of ports

4. The function of the Application Layer These programs implement the functions performed by users to accomplish network tasks like internet access or email This layer is not the application itself, but the protocols that are initiated by this layer End-user protocols such as HTTP, HTTPS, SMTP, DNS, and FTP work at this layer

5. Common application layer protocols DNS HTTP FTP LDAP POP3 SMTP IMAP4 DHCP

6. Application Layer Protocols and Ports