>It can mean only one thing, that bar.example does not exist. How could
>it be different?

My name server (running NSD) appears to disagree with you.  This is real data, 
feel
free to poke at it yourself.

$ dig @sdn.iecc.com bogus.www.examp1e.com a

; <<>> DiG 9.8.3-P1 <<>> @sdn.iecc.com bogus.www.examp1e.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 9914
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;bogus.www.examp1e.com.         IN      A

;; AUTHORITY SECTION:
examp1e.com.            3600    IN      SOA     ns1.he.net. 
hostmaster.examp1e.com. 2015111219 10800 900 604800 7200



$ dig @sdn.iecc.com www.examp1e.com a

; <<>> DiG 9.8.3-P1 <<>> @sdn.iecc.com www.examp1e.com a
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9303
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;www.examp1e.com.               IN      A

;; ANSWER SECTION:
www.examp1e.com.        3600    IN      CNAME   ghs.googlehosted.com.

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