Exam AZ-700 topic 1 question 24 discussion

Answer : --> One ExpressRoute Standard circuit --> One ExpressRoute gateway of the ErGw1AZ SKU

As I researched here in these 3 reference documentations: 1. https://learn.microsoft.com/en-us/azure/reliability/availability-zones-overview; 2. https://learn.microsoft.com/en-us/azure/vpn-gateway/create-zone-redundant-vnet-gateway 3. https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways#gwsku When deploying an ErGw1AZ, it is possible to define its zone availability as "Zone-Redundant", in addition it is also essential that the ip used by the ER Gateway be "Standard", because at the time of provisioning this ip will become redundant between the availability zones . Regarding the ER Circuit, it can be "Local", but in this scenario it would be unlimited and more expensive than the "Standard" Limited in 1Gbps. In my opinion the best answer would be: 1. One ExpressRoute Standard circuit 2. One ExpressRoute gateway of the ErGw1AZ SKU

For requirement of 1000 Mbps, ErGw1AZ is the most cost-effective choice while ensuring zone redundancy. 1ER Circuit required. ErGw1AZ: This SKU supports up to 1 Gbps and is designed for availability zone deployments, providing high availability and resiliency. ErGw2AZ: If you anticipate needing more bandwidth in the future, this SKU supports up to 2 Gbps and also offers zone redundancy. ErGw3AZ: This SKU supports up to 3 Gbps and is suitable if you expect significant growth in your bandwidth needs.

Standard/ERGw1Az 1 Gbps 500 4000 High Performance/ERGw2Az 2 Gbps 500 9,500 Ultra Performance/ErGw3Az 10 Gbps 500 9,500 ErGwScale (per scale unit) 1 Gbps 500 4,000

In Exam Feb 2024

Guess one and one....

These kind of questions really baffle my mind. How we suppose to memorize all the sku's and differences?

ExpressRoute Premium Circuits offer Zone-redundant Gateway (ZRG) functionality, which means that even if one Availability Zone fails, traffic can be redirected to another Zone without interruption. However, if two Availability Zones fail simultaneously, there might be an impact on connectivity. Answer: One ExressRoute Premium circuit One ExpressRoute gateway ErGw1AZ SKU

appears on exam, 19 Sept 2023

For the Gateway, you need only one, the new SKU are zone redundant: "you can deploy your gateways with zone-redundancy. This means that all instances of the gateways will be deployed across Azure Availability Zones" https://learn.microsoft.com/en-us/azure/vpn-gateway/create-zone-redundant-vnet-gateway#what-will-change-when-i-deploy-these-new-skus

Appeared on Exam 26 Aug 2023

For number of GW's, correct answer should be 1 ErGw1AZ: "For a VPN gateway, the two gateway instances will be deployed in any 2 out of these three zones to provide zone-redundancy. For an ExpressRoute gateway, since there can be more than two instances, the gateway can span across all the three zones." https://learn.microsoft.com/en-us/azure/vpn-gateway/about-zone-redundant-vnet-gateways#pipzrg

1. Maintain connectivity to the virtual machines if two availability zones fail - Needs two VPN gateways to tolerate two AV zones. https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways#zrgw 2. Support 1000-Mbps connections - Standard/ERGw1Az supports up to 1Gbps and support across geopolitical areas, which is more than enough. https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways#testing-conditions Therefore, the most cost-effective solution is; One ExpressRoute Standard circuit 2x ExpressRoute gateways (ErGw1AZ)

Update: Answer from ChatGPT Plus(GPT 4.0) To meet the requirements, you need to have the following: Minimum number of ExpressRoute circuits: Two ExpressRoute Standard circuits This is because ExpressRoute Standard circuits do not provide connectivity across multiple regions, and you need to maintain connectivity if two availability zones fail. Therefore, you will need two ExpressRoute Standard circuits to ensure connectivity in case of failure. Minimum number of ExpressRoute gateways: Two ExpressRoute gateways of the ErGw1AZ SKU The ErGw1AZ SKU supports up to 2,000 Mbps, which meets the 1,000 Mbps requirement, and it also provides Zone Redundant Gateway for increased reliability. Having two ExpressRoute gateways of the ErGw1AZ SKU ensures that connectivity is maintained even if two availability zones fail, meeting the requirement.

Answer from ChatGPT: To maintain connectivity to the virtual machines if two availability zones fail, at least two ExpressRoute circuits are required for redundancy, one of which must be in a different availability zone. For supporting a 1000-Mbps connection, ExpressRoute Premium is required. Therefore, the minimum number of circuits needed is two ExpressRoute Premium circuits. Regarding the minimum number of ExpressRoute gateways, at least one ExpressRoute gateway is required for each circuit. Therefore, two ExpressRoute gateways are required, one in each availability zone. Since the solution must minimize costs, the recommended SKU for the ExpressRoute gateway is the ErGw1AZ SKU, which is less expensive than the High performance SKU. Therefore, the answers are: Minimum number of ExpressRoute circuits: Two ExpressRoute Premium circuits Minimum number of ExpressRoute gateways: Two ExpressRoute gateways of the ErGw1AZ SKU

Express Route Zone redundant gateways can span to three AZ. I am not sure there, but I think the active ER GW only use the circuit so even if it would have been better to have one primary and one secondary circuit, you may have one ExpressRoute Standard circuit only, with 3 instances of Zone Redundant ER GW. https://learn.microsoft.com/en-us/azure/vpn-gateway/about-zone-redundant-vnet-gateways https://learn.microsoft.com/en-us/azure/expressroute/expressroute-about-virtual-network-gateways#gwsku Zone-redundant gateways When you create a public IP address using the Standard public IP SKU without specifying a zone, the behavior differs depending on whether the gateway is a VPN gateway, or an ExpressRoute gateway. For a VPN gateway, the two gateway instances will be deployed in any 2 out of these three zones to provide zone-redundancy. For an ExpressRoute gateway, since there can be more than two instances, the gateway can span across all the three zones.