DNS OSI Layer
Hi,
Is DNS reside in Session Layer or Application Layer?
Thank You.
Is DNS reside in Session Layer or Application Layer?
Thank You.
Comments
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goktan
Registered Users Posts: 4 ■□□□□□□□□□
Hi,
Although I've seen some debates about this, I believe the correct answer should be Application layer for the exam. Also wikipedia says so;
List of network protocols (OSI model) - Wikipedia, the free encyclopedia
Moreover, I've found similar discussion on this forum happened years ago, check if you want to see what others said then;
http://www.techexams.net/forums/network/15033-osi-layer-dns.html
hope this helps,
goktan -
mochaaddict
Member Posts: 42 ■■□□□□□□□□
I have always known dns to be layer 7. What rationale do you have to think it may be a session layer protocol?
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Justin-
Member Posts: 300
Application layer. I agree with the user above. Why you think it's session?
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tchoki
Banned Posts: 11 ■□□□□□□□□□
Session layer as with all directory services such as LDAP , X.500 . Also radius, tacacs+ , diameter, SMB , CIFS,NIS, NFS, SQL,RPC,Netbios, all work at the session layer . ISC2 says it clearly in its seminar book. -
JDMurray
Admin Posts: 13,025 Admin
DNS really does not use session control. The 53/udp function is just a call and response with no preserved state information. The 53/tcp function is basically a file information transfer, like FTP, that uses one TCP connection per transfer. If DNS could do multiple, independent, simultaneous zone transfers over a single TCP connection then I'd say DNS used the OSI session layer.
Forum Admin at www.techexams.net
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papadoc
Member Posts: 154
One of the things I learned from the SANS MGT414 course was they teach you how to think in the "ISC2" world. I would go with what tchoki said --the ISC2 - Official Guide to the CBK - Third Edition.
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