$(15$ Points$)$ DNS

You are provided with the output of a dig command query for the domain $"$

srv$.$qifanz.com".

Analyze the provided dig result and answer the questions below.

$($a$)$ To resolve $"$

srv$.$qifanz.com", how many levels of name servers are involved during the

recursive resolution process?

$($b$)$ Is this query transmitted over TCP or UDP?

$($c$)$ What type of DNS record was queried for $"$

srv$.$qifanz.com"? Is it an alias or canonical

name? If it is an alias name, what is the canonical name and what is the IP address

associated with the canonical name?

$($d$)$ Identify the name servers in the dig result. Which domain they are authoritative for?

What is the TTL for those results? Discuss the significance of the TTL values found in

the ANSWER and AUTHORITY sections.

$($e$)$ What is the query time about this DNS query?