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Exam AZ-301 topic 4 question 7 discussion

Actual exam question from Microsoft's AZ-301

Question #: 7
Topic #: 4

HOTSPOT -
Your company has two on-premises sites in New York and Los Angeles and Azure virtual networks in the East US Azure region and the West US Azure region.
Each on-premises site has Azure ExpressRoute circuits to both regions.
You need to recommend a solution that meets the following requirements:
✑ Outbound traffic to the Internet from workloads hosted on the virtual networks must be routed through the closest available on-premises site.
✑ If an on-premises site fails, traffic from the workloads on the virtual networks to the Internet must reroute automatically to the other site.
What should you include in the recommendation? To answer, select the appropriate options in the answer area.
NOTE: Each correct selection is worth one point.
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Suggested Answer:

by sparkf1 at Oct. 4, 2019, 4:09 p.m.

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Oz

Highly Voted 5 years, 6 months ago

To answer the second part, Microsoft does not support any router redundancy protocols (for example, HSRP, VRRP) for high availability configurations. Ref: https://docs.microsoft.com/en-us/azure/expressroute/expressroute-routing So the only correct answer is BGP.

upvoted 21 times

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yogi2020

Highly Voted 5 years, 3 months ago

The given answer are correct. Both BGP Border gateway protocol An on-premises network gateway can exchange routes with an Azure virtual network gateway using the border gateway protocol (BGP). Using BGP with an Azure virtual network gateway is dependent on the type you selected when you created the gateway. If the type you selected were: ExpressRoute: You must use BGP to advertise on-premises routes to the Microsoft Edge router. You cannot create user-defined routes to force traffic to the ExpressRoute virtual network gateway if you deploy a virtual network gateway deployed as type: ExpressRoute. You can use user-defined routes for forcing traffic from the Express Route to, for example, a Network Virtual Appliance.

upvoted 12 times

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genmai

Most Recent 4 years, 2 months ago

You can refer to this URL: https://docs.microsoft.com/ja-jp/azure/expressroute/designing-for-disaster-recovery-with-expressroute-privatepeering BGP is used in two Azure regions and two on-premises sites.

upvoted 1 times

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azurecert2021

4 years, 3 months ago

given answer is correct.

upvoted 1 times

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glam

4 years, 3 months ago

BGP BGP

upvoted 1 times

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sanketshah

4 years, 4 months ago

1. user defined routes 2. BGP

upvoted 2 times

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user_name

4 years, 8 months ago

https://docs.microsoft.com/en-us/azure/expressroute/expressroute-optimize-routing#suboptimal-routing-from-customer-to-microsoft BGP BGP

upvoted 2 times

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jadi11

4 years, 10 months ago

https://docs.microsoft.com/en-us/azure/expressroute/expressroute-optimize-routing#suboptimal-routing-from-customer-to-microsoft so definitely BGP BGP

upvoted 4 times

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zeroweb

4 years, 10 months ago

You must use BGP to advertise on-premises routes to the Microsoft Edge router. You cannot create user-defined routes to force traffic to the ExpressRoute virtual network gateway if you deploy a virtual network gateway deployed as type: ExpressRoute. You can use user-defined routes for forcing traffic from the Express Route to, for example, a Network Virtual Appliance. https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview

upvoted 2 times

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MeasService

5 years, 1 month ago

Both answers are correct. BGP should be used instead of UDR. In terms of route priority, first it will take BGP, then UDR and if both are not available, it will go to default routs. For the Second part, Azure does not support HSRP nor VRRP, so It should be BGP

upvoted 3 times

gboyega

4 years, 10 months ago

Correct. BGP BGP

upvoted 2 times

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senatori

5 years, 1 month ago

the first question is correct since in the question it is said : "must be routed through the closest available on-premises site", and with and UDR(static routes), you can't select the closest available on-premise site, but for that you need a dinamic routing protocol, so BGP.

upvoted 1 times

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pradjhun

5 years, 5 months ago

Answer is correct as UDR can be use along with Express route..

upvoted 1 times

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sparkf1

5 years, 7 months ago

Routing from the virutal network to the on-premises location should be configured by "User-defined routes". https://docs.microsoft.com/en-us/azure/virtual-network/virtual-networks-udr-overview#user-defined

upvoted 9 times

Oz

5 years, 6 months ago

Totally agree, default route in Azure VNET should be changed to point 0.0.0.0 back to on-prem site. I've done it in real project.

upvoted 5 times

AzureGC

5 years, 6 months ago

For the first part, it appears BGP is the correct answer, as this is an ExpressRoute: Virtual network gateway: Specify when you want traffic destined for specific address prefixes routed to a virtual network gateway. The virtual network gateway must be created with type VPN. You cannot specify a virtual network gateway created as type ExpressRoute in a user-defined route because with ExpressRoute, you must use BGP for custom routes. ExpressRoute: You must use BGP to advertise on-premises routes to the Microsoft Edge router. You cannot create user-defined routes to force traffic to the ExpressRoute virtual network gateway if you deploy a virtual network gateway deployed as type: ExpressRoute. You can use user-defined routes for forcing traffic from the Express Route to, for example, a Network Virtual Appliance

upvoted 29 times

tartar

4 years, 8 months ago

BGP BGP

upvoted 2 times

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onlyfunmails

5 years, 4 months ago

Azure to On-premise --> only BGP On-premise to Azure --> can use UDR ExpressRoute: You must use BGP to advertise on-premises routes to the Microsoft Edge router. You cannot create user-defined routes to force traffic to the ExpressRoute virtual network gateway if you deploy a virtual network gateway deployed as type: ExpressRoute. You can use user-defined routes for forcing traffic from the Express Route to, for example, a Network Virtual Appliance.

upvoted 3 times

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