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ECMS Practice Question - Nov/2nd

SOLVED
RafaelM
Meraki Employee

ECMS Practice Question - Nov/2nd

ECMS question

 

In a topology consisting of 2 MX hubs with 2 uplinks each and 20 MX spokes with 1 uplink each, how many AutoVPN tunnels are created in total in this organization? Assume all spokes are connected to both hubs.

 

  1. 22
  2. 40
  3. 80
  4. 84

    vpn.PNG

 

 

 

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1 ACCEPTED SOLUTION

Accepted Solutions
RafaelM
Meraki Employee

Re: ECMS Practice Question - Nov/2nd

Answer: d. 84

 

Explanation:

 

Every branch MX will form 2 tunnels to each hub (80 tunnels in total), and then the hubs will form 4 tunnels between each other (4 more tunnels), giving us a total of 84 tunnels!

 

I hope you have all enjoyed this practice question!

~~If you found this post helpful, please give it kudos. If my answer solved your problem, click "accept as solution" so that others can benefit from it.~~

The Meraki ECMS exam is now live! Test your knowledge of Meraki and become an official Cisco Meraki Solutions Specialist. More info on the ECMS exam found here.

For information regarding all of Meraki's training offerings, be sure to check out the Meraki Learning Hub.

View solution in original post

12 REPLIES 12
KarstenI
Head in the Cloud

Re: ECMS Practice Question - Nov/2nd

Spoiler
Number of Hubs * (Number of Hubs -1)/2  * (Uplinks per Hub)^2 + Number of Hubs * Number of Spokes * Number of Uplinks on Hub * Number of Uplinks on Spoke
RomanMD
Here to help

Re: ECMS Practice Question - Nov/2nd

The question is quite interesting, but there is still at least one unknown variable...

So, this is why I don't like Cisco way of building questions.. 😞

 

RomanMD_0-1604346606688.png

 

KarstenI
Head in the Cloud

Re: ECMS Practice Question - Nov/2nd


@RomanMD wrote:

The question is quite interesting, but there is still at least one unknown variable...

So, this is why I don't like Cisco way of building questions.. 😞

 

RomanMD_0-1604346606688.png


Actually, there is no unknown variable in this question. Only one of the two options gives one of the offered answers.

PhilipDAth
Kind of a big deal

Re: ECMS Practice Question - Nov/2nd

Spoiler
Each spoke would have two tunnels to each hub, so 20 spokes*2 tunnels*2 hubs=80 tunnels.

The hubs would then have two tunnels between them for each Internet circuit.  So 2x2=4 tunnels.


So I'm going with 84 tunnels.

 

UCcert
Kind of a big deal

Re: ECMS Practice Question - Nov/2nd

D:84

Darren O'Connor | uccert.co.uk
https://www.linkedin.com/in/darrenoconnor/

I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.
cmr
Kind of a big deal
Kind of a big deal

Re: ECMS Practice Question - Nov/2nd

E: 🐕

Kamome
Getting noticed

Re: ECMS Practice Question - Nov/2nd

Spoiler
Every spoke MX will establish 4 AutoVPN tunnels with Hub MXs. (Spoke MX have only 1 uplink, but every hub have 2 uplinks. So each hub will have 2 tunnels with each spoke. And there are 2 hubs, so every spoke will get 4 tunnels.)

There are 20 spoke MXs, so there will be total 80 tunnels, (4 tunnels per spoke x 20 spokes = 80 tunnels)

Plus, every hubs in same organization will create tunnels with every other hubs via all available uplinks. There are 2 hubs in this organization and every hub have 2 tunnels, so there will be 4 tunnels between hubs.

Therefore, total 84 tunnels will be created in this organization. (80 for Hub-Spoke, 4 for mesh between Hubs)

Ans) d. 84
UCcert
Kind of a big deal

Re: ECMS Practice Question - Nov/2nd

@cmr  😂 - Woof

Darren O'Connor | uccert.co.uk
https://www.linkedin.com/in/darrenoconnor/

I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.
rbnielsen
Head in the Cloud

Re: ECMS Practice Question - Nov/2nd

Honestly I'm more interested in the question regarding failover times. 😉

The Meraki Documentation is unclear on the point, and I have yet to meet someone with a convincing argument.

GIdenJoe
Head in the Cloud

Re: ECMS Practice Question - Nov/2nd

Thank god AutoVPN is not like regular IPsec VPN or you would need to count 1 phase 1 SA and 2 phase 2 SA's per individual tunnel, and even worse if you used policy based VPN with multiple traffic selectors...

But in this case before I looked at the spoilers I went for 84 too 😉

 

I know the questions omits the active active VPN option, but you need to select the "best" answer.

RafaelM
Meraki Employee

Re: ECMS Practice Question - Nov/2nd

Answer: d. 84

 

Explanation:

 

Every branch MX will form 2 tunnels to each hub (80 tunnels in total), and then the hubs will form 4 tunnels between each other (4 more tunnels), giving us a total of 84 tunnels!

 

I hope you have all enjoyed this practice question!

~~If you found this post helpful, please give it kudos. If my answer solved your problem, click "accept as solution" so that others can benefit from it.~~

The Meraki ECMS exam is now live! Test your knowledge of Meraki and become an official Cisco Meraki Solutions Specialist. More info on the ECMS exam found here.

For information regarding all of Meraki's training offerings, be sure to check out the Meraki Learning Hub.

View solution in original post

wilanddar
Conversationalist

Re: ECMS Practice Question - Nov/2nd

Are practice exams offered any where to test knowledge before the real thing

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