[The domain has recently changed its configuration so do not test it.]

With Unbound, I get a SERVFAIL:

% dig DNSKEY cepn.asso.fr

; <<>> DiG 9.9.5-8-Debian <<>> DNSKEY cepn.asso.fr
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 62442
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;cepn.asso.fr.          IN DNSKEY

;; Query time: 21 msec
;; SERVER: ::1#53(::1)
;; WHEN: Mon Feb 16 16:57:58 CET 2015
;; MSG SIZE  rcvd: 41

But BIND accepts it (and so does Google Public DNS):

% dig @relay1.nic.fr DNSKEY cepn.asso.fr

; <<>> DiG 9.9.5-8-Debian <<>> @relay1.nic.fr DNSKEY cepn.asso.fr
; (2 servers found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30861
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;cepn.asso.fr.          IN DNSKEY

;; ANSWER SECTION:
cepn.asso.fr.           7808 IN DNSKEY 257 3 5 (
                                AwEAAaBtXBNAyFHVvRBB4K9z79+1YRXkUDyycyCzPRpm
                                Xi9lhB0Eg5vM3XlaS6OuN0dnFHItpZFNIDBDrPsN1OCf
                                1ULKWpD3KDl1mE7zRK2W0HXeu4WOoFpUcC/1h06W26DT
                                CkisntU9L8JfPi9osmI+CuzWZhdmyZt+hPvMpjmDthyh
                                MZpb//kNv7+TUeczCo4MExHxjHHIVH0vRmhfyo/J1KBe
                                6eS3G5lDbJEEFUdxuLyGQLaG2f6wlQxoHGnzvM+V/Mj8
                                yGHae//7Z5rMCdaiLJy03u5+l2WVVy954dsrFC6mkB5s
                                M4n8nvbo1d5ap7cI76dJi9X0IUJQohZk5b5eef0=
                                ) ; KSK; alg = RSASHA1; key id = 36778
cepn.asso.fr.           7808 IN DNSKEY 256 3 5 (
                                AwEAAc6AqnBoi+hfxMqtb0eokyqWT46Os5N6ZYoFm8Gb
                                t90EF3hTpuwDClEsulKSckhr4zFTDj3SvHc9krzeQEl5
                                UNCqmmZeMo/wsxKHTzIVU75fPrs1zOuM9m9zRNV4q9eG
                                Y0+I2h4D7E/WlPE7n57E0lmPOxK9g46xE8p9eX3bWVVK
                                FSm60VvginZfTzN3Zgt+peecrboEZnSzWvDVcHY2dq+o
                                w0UEekI1+nfwcIgEOn0Wh8B5Gx3pG5XkV3QvHVN514FH
                                eJLdsk0iFPHv1Xc0rLYWssFVS9s7Z8u0tEju6LshGaPQ
                                +zrQr54RMD9IecwbMCERcrjV2Dm5CZq+Jf53pGc=
                                ) ; ZSK; alg = RSASHA1; key id = 54030
cepn.asso.fr.           7808 IN RRSIG DNSKEY 5 3 10800 (
                                20250115124200 20150216080551 36778 
cepn.asso.fr.
                                fc1YnbjbglVC8alL9NN9LUo54kUODgk6gblFt+CjDJ4+
                                0i9HqEdbbW/49wksEMkFySPf24yRaswbf9W/OHeJtXid
                                6CEcVdZiHfPuTzxBelQVfPiIQreJ9yvxBF1z/pmTBf0X
                                o8TEMUjaV4f2c5eqELKdZ986RRk6J35tDd0w3cbeHGV1
                                mnAagjT+SOLlmF8mx6MZkgsgFylBIt0MfEaX1ZS4PfAh
                                TCIXi6shM0KcwZ7rI24nVGcu6wDfxdiwUZ5lJ6KWFBsM
                                pC0beLiKRYlqnQidkech+dlSHQGj0DXAINi6ZrS+iRhv
                                mCLlId4oezMaxx8P3dLo71cAqPGNBwM62A== )
cepn.asso.fr.           7808 IN RRSIG DNSKEY 5 3 10800 (
                                20250115124200 20150216080551 54030 
cepn.asso.fr.
                                v1b7K0jZ4WH1yMCvJHOkxWp7EUHtsFPpKjwplu8EhqDs
                                WAwB0ORSFMN6Y0PDMfSydXeSwn3+L75OKk1Ne6VNaE5E
                                jeYi7BEChE0wZH1L6/qyIHgw0YCDfQN4HuG005RFRKgi
                                p1t06h3iKnVHFzduSxSby5Oq3iZgbyaSPeAhDa/LZPXv
                                oNb1cVmVrPKTIhZqSxKNC0t4XQ3iUffgrLvq1ErFeuut
                                QQeD3uzwWXCUkZA5rK7fp9eKKlSOJpP3na2r8cEy0WlC
                                jZ2HNPA6pIUnq+w7eD0oGp0aukJ1C85TeE1a8cr3Luf8
                                LnSXm7cIxSWOdw9GZEjaavWFfpYdguFxQQ== )

;; Query time: 1 msec
;; SERVER: 2001:67c:2218:9::4:162#53(2001:67c:2218:9::4:162)
;; WHEN: Mon Feb 16 17:01:03 CET 2015
;; MSG SIZE  rcvd: 1193

I also tested with OARC's ODVR service which confirmed that there is a
difference between BIND and Unbound. 

At the time of the test, the DS were:


% dig DS cepn.asso.fr

; <<>> DiG 9.9.5-8-Debian <<>> DS cepn.asso.fr
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 6975
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;cepn.asso.fr.          IN DS

;; ANSWER SECTION:
cepn.asso.fr.           171998 IN DS 36778 5 2 (
                                D21FC827CF4621DF88D06A8F6EA5F4B4DE72A362AB2E
                                03D440C315A9D8FE1407 )
cepn.asso.fr.           171998 IN DS 13585 8 2 (
                                AB057D7A9BBDB721EBD33FC64F3C6CC53D9020D12F18
                                BCEFC696494C9F9D6111 )
cepn.asso.fr.           171998 IN RRSIG DS 8 3 172800 (
                                20150321132707 20150120132707 36264 fr.
                                sotb2QNe0eJ6v6AxNaRgOzwYZVpg4XwDvRNp2S01kW/B
                                ImMpX5oYo2EpIkmbcO+1y+yNjk0tqyiEo1OJbxzpyV1X
                                xrUDQXjV1qbLgxZD3xLe9UG/VsMpImZJaiXjyd5xCT31
                                sPmNdh8d/T5FzWTb6jGWUY1GC4WHp8Ib4I9GWgI= )

;; Query time: 0 msec
;; SERVER: ::1#53(::1)
;; WHEN: Mon Feb 16 16:58:19 CET 2015
;; MSG SIZE  rcvd: 299


DNSviz, like Unbound, says the domain is broken:

http://dnsviz.net/d/cepn.asso.fr/VOGwhA/dnssec/

But Zonemaster sees no problem:

http://zonemaster.net/test/3713

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