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Exam AZ-301 topic 17 question 16 discussion

Actual exam question from Microsoft's AZ-301
Question #: 16
Topic #: 17
[All AZ-301 Questions]

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 Oz at Nov. 1, 2019, 6 p.m.

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Highly Voted 4 years, 10 months ago
Routing from the virtual networks to the on-premises locations must be configured by using: > BGP, because ExpressRoute forced tunneling is enabled by advertising a default route via the ER BGP peering sessions (wheras you would use user-defined routes when there is a S2S VPN in place). https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-forced-tunneling-rm The automatic routing configuration following a failover must be handled by using: > BGP, because Microsoft does not support any router redundancy protocols (e.g. HSRP, VRRP) for HA configurations. They rely on a redundant pair of BGP sessions per peering for HA. https://docs.microsoft.com/en-us/azure/expressroute/expressroute-routing
upvoted 7 times
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AzureGuy
Most Recent 4 years, 3 months ago
This was on my AZ-304 exam yesterday. BGP/BGP
upvoted 2 times
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GV13
4 years, 9 months ago
Correct answer is- 1. User Defined Routes 2. Border Gateway protocol
upvoted 1 times
macco455
4 years, 9 months ago
Wrong..given answer is correct BGP for both
upvoted 3 times
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Harkonnen
4 years, 10 months ago
The answer is INCORRECT. The Border Gateway Protocol is a routing protocol. Meaning takes packets coming from a location and routes them to another location. IT DOES NOT CREATE ROUTES. In principle, all routes are used user-defined. However, Azure may create some by default for you. The protocol is used to propagate these routes and other Gateway information between gateways. But it does not create routes. Something that you can use the protocol for is to learn if a defined route is not available. Based on that the BGP can decide to re-route it through a secondary location. Thus, to me the correct answers are: 1. User-defined routes (I don’t think that the requested route, “Outbound traffic to the Internet from workloads hosted on the virtual networks must be routed through the closest available on-premises site”, is part of the Azure defaulted routes. 2. Border Gateway Protocol
upvoted 2 times
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Kaawa
4 years, 11 months ago
BPG/BPG, see: https://docs.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-forced-tunneling-rm
upvoted 2 times
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pandeya442
5 years, 1 month ago
repeated- BGP/BGP
upvoted 3 times
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Myk
5 years, 5 months ago
Yeah this is a repeat question
upvoted 2 times
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Oz
5 years, 8 months ago
User defined routes should be configured to modify Azure default routes that send internet traffic (0.0.0.0/0) via Azure Internet. UDR will send updates via BGP to all VMs in the VNET. So answer is: UDR BGP
upvoted 3 times
piotr
5 years, 7 months ago
You are wrong, BGP in both cases. Default route is a system-generated route and can be overwritten by either UDR or BGP. Azure route selection process is: User-defined route BGP route System route UDR does not propagate to VM as VM are not BGP peers. Only VNET prefix is advertised by BGP back to on-premise.
upvoted 13 times
asdfgh1234567
4 years, 11 months ago
The reason why UDR is wrong is because it won't dynamically updated when there is a failure. BGP is correct for this reason.
upvoted 2 times
tartar
4 years, 9 months ago
BGP BGP
upvoted 5 times
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