Remember your CCNA stuff guys! The OSI model is a model. Nothing else. It provides no standards or even any guidelines.
If your protocol of choice does not match perfectly to it then tough. And really who cares? I don't, The times I have cared I use Ethereal to have a look and see. I also suggest that the likes of OSPF and EIGRP have application layer properties too. We just dont seem to acknowledge that fact as they dont have any transport layer port numbers. Think about it... They both do sequencing and acknowledgements at the transport layer and you have all your LSA types, Packet types, K values and everything else as payload in every single packet. Far out there are even checksums to make sure the packet is ok. Anyway, I dont think I am breaching the NDA when I say I dont think you will be tested on bit-level detail of routing packets in the Lab exam. I didn't. Actually the guy next to me did... He said that he also had trouble finding the mac address of his serial interfaces on his 877*. * before some smartarse pipes up... I know 877s dont have serial interfaces and serial interfaces dont have mac addressees. Also 877s are not in the blueprint. So there. Cheers, Matt CCIE #22386 CCSI #31207 2009/8/19 Rick Mur <[email protected]>: > What would you say they are then? > Not all protocols have a direct presentation and session layer. That's why > these are combined in the IP model. Since they rely on another transport > protocol, they aren't the same as OSPF and EIGRP. I would definitely say BGP > and RIP are protocols that run in the application layer. > > -- > Regards, > > Rick Mur > CCIE2 #21946 (R&S / Service Provider) > Juniper JNCIA-ER & JNCIA-EX > MCSA:Messaging, MCSE > Sr. Support Engineer – IPexpert, Inc. > URL: http://www.IPexpert.com > > On Wed, Aug 19, 2009 at 10:51 AM, desmond Black <[email protected]> > wrote: >> >> Both RIP and BGP are applications in what sense? Only because they use the >> Port-numbers for identicification & that EIGRP, OSPF, ISIS etc dont? >> Transport Layer is Port numbers [in a very raw sense]. What Presentation >> Layer protocol does BGP & RIP use? And What Application Layer thing are we >> talking about for running them?? >> I personally think its just a sham to write these Protocols off as >> Application layer Protocols. >> >> ----- Original Message ----- >> From: "Dale Shaw" >> To: "Taqdir Singh" >> Cc: [email protected] >> Subject: Re: [OSL | CCIE_RS] RIP and BGP are application layer protocol >> Date: Wed, 19 Aug 2009 17:07:07 +1000 >> >> >> Hi, >> >> On Wed, Aug 19, 2009 at 4:58 PM, Taqdir Singh wrote: >> > TCP and UDP are transport layer protocols. RIP uses UDP and BGP uses >> > TCP.. >> > >> > Please clear more how RIP and BGP are application layer ? >> >> This is pretty standard OSI model stuff. C'mon, do we really need to >> cover it here? >> >> Both RIP and BGP are applications and therefore have an application >> layer. The transport layer protocol employed is largely irrelevant. >> >> Cheers, >> Dale >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, >> please visit www.ipexpert.com >> >> >> >> Desmond Black, >> In Pursuit of CCIE!! >> India >> >> -- >> Be Yourself @ mail.com >> Choose From 200+ Email Addresses >> Get a Free Account at www.mail.com! >> _______________________________________________ >> For more information regarding industry leading CCIE Lab training, please >> visit www.ipexpert.com >> > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
