DNS Data exfiltration — What is this and How to use?

1. What is DNS Data exfiltration and how does it work?

Figure 1. A simple definition of DNS Data exfiltration
Figure 2. A DNS resolution flow (source: tcpipguide.com)
Figure 3. A setting of NS records
Figure 4. An example which uses DNS Data exfiltration (source: blogs.akamai.com)
Figure 5. Use CNAME record to send data from outside

2. How to use DNS Data exfiltration?

Figure 6. Screenshot of requestbin.net/dns



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I'm a developer working in cyber security. My regularly IDE is MS Word.