Example of a failing DNS request

I've run into an DNS issue today. I usually scan quickly the answer from dig as I'm interested in the actual A, PTR or MX only. Today the issue was different. Below in the two failing example DNS requests please note the SERVFAIL status code.

Example 1

 
dig @194.2.2.2 www.example.com A

; DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> @194.2.2.2 www.example.com A
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 5995
;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.example.com. IN A

;; ANSWER SECTION:
www.example.com. 86400 IN CNAME buuu.example.com.

Example 2

 
dig @194.2.2.2 www.example.com

; DiG 9.3.6-P1-RedHat-9.3.6-16.P1.el5 <<>> @83.138.151.80 www.example.com
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 55778
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;www.example.com. IN A

;; Query time: 12 msec
;; SERVER: 194.2.2.2#53(194.2.2.2)
;; WHEN: Mon Mar 25 17:41:28 2013
;; MSG SIZE  rcvd: 52

References

1. http://networking.ringofsaturn.com/Unix/dnstroubleshooting.php