From: Tarun Pahuja (pahujat@gmail.com)
Date: Tue Oct 23 2007 - 05:14:39 ART
Scott,
I hope your last response was not a Joke ;-) I know you like to
joke sometimes........
There are 5 different type of network types under ospf namely:
1. broadcast
2. non-broadcast
3. point-to-point
4. point-to-multipoint
5. point-to-multipoint non-broadcast
One can not simply use 5+4+3+2+1 logic or any other mathematical logic to
figure out what possible combinations are possible. Every network type under
ospf has certain characteristics(DR/BDR,Hello,Dead interval,etc). For ospf
to form adjacency with neighbors certain conditions must be met or else no
relationship would be formed. Additionally, as per Cisco Routing and
Switching official exam guide, it is not recommended to form neighbor
relationship between ospf network types requiring a DR/BDR and network types
that do not require a DR/BDR in NBMA networks even though the neighbor
relation comes up after fine tuning the Hello/Dead intervals.
HTH,
Tarun Pahuja
CCIE#7707(R&S,Security,SP,Voice,Storage),CCSI
On 10/22/07, Scott Morris <smorris@ipexpert.com> wrote:
>
> It's just math. 5+4+3+2+1 I didn't spend any time thinking more about
> what
> things would/wouldn't change. That's the part about studying. :)
>
> -----Original Message-----
> From: Joseph Brunner [mailto:joe@affirmedsystems.com]
> Sent: Monday, October 22, 2007 10:45 AM
> To: 'Scott Morris'; 'Ananth Vk'; ccielab@groupstudy.com
> Subject: RE: Query : Network Types
>
> Scott is that 15 number including when we use 2 network types that
> do/don't
> require a dr and change the timers?
>
> -Joe
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Scott Morris
> Sent: Monday, October 22, 2007 10:20 AM
> To: 'Ananth Vk'; ccielab@groupstudy.com
> Subject: RE: Query : Network Types
>
> As long as you have labbed those up and SEEN how things work, you'll have
> no
> worry about the order or combination or anything.
>
> There are 5 network types:
>
> 1. broadcast
> 2. non-broadcast
> 3. point-to-point
> 4. point-to-multipoint
> 5. point-to-multipoint non-broadcast
>
> If you are aware of the details of each, you'll be fine. Mathematically,
> there are 15 different combinations you can come up with.
>
> HTH,
>
>
> Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713,
> JNCIE-M
> #153, JNCIS-ER, CISSP, et al.
> CCSI/JNCI-M/JNCI-ER
> VP - Technical Training - IPexpert, Inc.
> IPexpert Sr. Technical Instructor
>
> A Cisco Learning Partner - We Accept Learning Credits!
>
> smorris@ipexpert.com
>
> Telephone: +1.810.326.1444
> Fax: +1.810.454.0130
> http://www.ipexpert.com
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ananth Vk
> Sent: Monday, October 22, 2007 5:31 AM
> To: ccielab@groupstudy.com
> Subject: Query : Network Types
>
> Hi
>
> I just wanted to confirm that these are the following network types
> regardless of layer 3 protocol
>
> 1. point to point - serial point to point links
>
> 2. broadcast - lan
>
> 3. NBMA (FR/ATM/etc)
>
> A. Pure Point-to-Point Configuration (each VC on a separate subinterface)
>
> B. Pure Multipoint Configuration (no subinterfaces)
>
> C. Hybrid Configuration (point-to-point and multipoint subinterfaces)
>
> I got this from a cisco link, is this the right order/fashion that i
> should
> remember / is there a different perspective ?
>
> Pls advice !
>
>
> Thanks
> Ananth
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