topic Re: ECMS Practice Question - Feb 5th in Cloud Networking Platform

ECMS Practice Question - Feb 5th

rmarta — Fri, 05 Feb 2021 18:55:42 GMT

ECMS Question

Refer to the exhibit. Assume that the MX in question is a spoke connected via AutoVPN to one hub using split tunnels, all its local subnets have been advertised over the VPN, and both its WAN connections are up. How will the MX route traffic sourced from subnet 172.17.25.0/24 destined for the internet?

It will be sent out WAN1 as long as it is up.
It will be sent out WAN2 as long as it is up.
It will be sent out WAN1 as long as it meets the thresholds in the performance class called “Telepresence”.
It will be sent out WAN2 as long as it meets the thresholds in the performance class called “Telepresence”.
It will be load balanced between WAN1 and WAN2.

Re: ECMS Practice Question - Feb 5th

CMR — Fri, 05 Feb 2021 19:16:45 GMT

I'm going for Lando Norris

Re: ECMS Practice Question - Feb 5th

Philip D'Ath — Fri, 05 Feb 2021 22:22:48 GMT

Another good question!

Spoiler

Re: ECMS Practice Question - Feb 5th

ww^ — Sat, 06 Feb 2021 17:23:12 GMT

Re: ECMS Practice Question - Feb 5th

Karsten Iwen — Sun, 07 Feb 2021 07:59:31 GMT

Spoiler

First we have to find out the relevant information:
- AutoVPN is in use, but uses SplitTunnel
- It is traffic to the internet

- Load balancing is enabled
- The only flow-Preference for the source is the last one for 9.9.9.9/32. Although it is an address on the internet, it's not "the internet".

It is not a) or b) as we have load balancing enabled but no flow preference matches

It is not c) or d) as it is no AutoVPN-traffic

The answer should be "e".

First we have to find out the relevant information: - AutoVPN is in use, but uses SplitTunnel - It is traffic to the internet - Load balancing is enabled - The only flow-Preference for the source is the last one for 9.9.9.9/32. Although it is an address on the internet, it's not "the internet". It is not a) or b) as we have load balancing enabled but no flow preference matchesIt is not c) or d) as it is no AutoVPN-trafficThe answer should be "e".

Re: ECMS Practice Question - Feb 5th

CMR — Sun, 07 Feb 2021 08:11:32 GMT

@Karsten Iwen indeed, I missed the split tunnels part, so Sebastian Vettel it is...

Re: ECMS Practice Question - Feb 5th

Raphael_L — Mon, 08 Feb 2021 19:12:29 GMT

I'm not getting those F1 references . But I would go with

Spoiler

Re: ECMS Practice Question - Feb 5th

CMR — Mon, 08 Feb 2021 19:17:55 GMT

@Raphletourn

Re: ECMS Practice Question - Feb 5th

Raphael_L — Mon, 08 Feb 2021 19:19:36 GMT

oh god... I feel ashamed ...

Now I get it 🙂

Re: ECMS Practice Question - Feb 5th

CMR — Mon, 08 Feb 2021 19:21:26 GMT

🤣just my odd sense of humour! 😇

Re: ECMS Practice Question - Feb 5th

ECMS-550-220 — Sun, 14 Feb 2021 09:39:58 GMT

C . It will be sent out WAN1 as long as it meets the thresholds in the performance class called “Telepresence”.

will prefer WAN2 if telepresence performance cross threshold

E may be incorrect As it said load balanced with WAN1 & WAN2 but flow preference marked for WAN1

Re: ECMS Practice Question - Feb 5th

bryand2 — Tue, 16 Feb 2021 00:02:24 GMT

It's D.

Re: ECMS Practice Question - Feb 5th

BRUCE NEWTON — Tue, 16 Feb 2021 05:12:37 GMT

Can't wait to see the Meraki answer to this one. In my opinion it should be E.

The key factors are that the AutoVPN is split tunnel and that it is internet traffic.

Being internet traffic with a split tunnel the traffic is not impacted by the SD-WAN policies.

Since there is no Internet Flow Preference for the source address/subnet, and assuming its not going to host 9.9.9.9, then the traffic will be load-balanced out of WAN1 and WAN2 as this is the default routing if no other preferences apply.

Well, that's my theory anyway.....

Re: ECMS Practice Question - Feb 5th

rmarta — Fri, 19 Feb 2021 17:36:25 GMT

After all the conversations that were had in this chat, I am happy to announce that the correct answer is...

🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁🥁

E! Traffic coming from that subnet bound to the internet will leave through the local breakout (split tunnel), and since there is no specific flow preference for that subnet, it will be load balanced!

Thanks for tuning in. We're soon coming back with another question!