OSI layers and security
The upcoming section covers some important protocols in OSI layers. Application layer protocols, presentation layer protocols, session layer protocols, and their security are covered in this chapter. The remaining layers are covered in the next chapter.
This section also gives an overview of security weaknesses in such layer/protocols as well as security measures to mitigate such weaknesses.
Application layer protocols and security
In the application layer, some of the important protocols are Domain Name System (DNS), Dynamic Host Configuration Protocol (DHCP), Hyper Text Transfer Protocol (HTTP), File Transfer Protocol (FTP), TELNET, Post Office Protocol (POP3), Internet Message Access Protocol (IMAP), Simple Mail Transfer Protocol (SMTP), and Simple Network Management Protocol (SNMP).
Domain Name System (DNS)
DNS works at the application layer. DNS translates domain names into IP addresses. DNS's main purpose is to resolve host names to matching numeric IP addresses...