Application Layer- DNS Protocol Show how to do the following: a- it is required to display the local DNS cache in your computer. First clear your local machine DNS cache, check connectivity to the FQDN of your classmate's computer, and then display the local DNS cache content. What do you observe? b- Repeat the display command for the local DNS cache and observe the TTL value. State your observations. What happens when the TTL value reaches 0? c- What will happen in case you want to communicate with a computer whose entry details (FQDN and IPv4 address) were flushed from the local DNS cache? d- Design and implement an experiment to generate a DNS response followinga DNS query to a non-existing FQDN. Describe all the steps used to generate such a response and explain the results. Application Layer- DNS Protocol Show how to do the following: a- it is required to display the local DNS cache in your computer. First clear your local machine DNS cache, check connectivity to the FQDN of your classmate's computer, and then display the local DNS cache content. What do you observe? b- Repeat the display command for the local DNS cache and observe the TTL value. State your observations. What happens when the TTL value reaches 0? c- What will happen in case you want to communicate with a computer whose entry details (FQDN and IPv4 address) were flushed from the local DNS cache? d- Design and implement an experiment to generate a DNS response followinga DNS query to a non-existing FQDN. Describe all the steps used to generate such a response and explain the results