A multinational firm must configure ExpressRoute Private Peering with Azure and the provider asks them to specify the primary and secondary prefix values to be used for the two BGP sessions. Select TWO IPv4 subnets from the choices below that meet Azure ExpressRoute Private Peering requirements (primary and secondary).
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Correct answer: 10.10.20.0/30, 203.0.113.0/30.
Why this is the answer
Azure ExpressRoute Private Peering requires /30 IPv4 subnets for the primary and secondary BGP sessions. These subnets are used to establish the BGP peering between the customer edge router and Microsoft's edge routers. The /30 subnet provides two usable IP addresses, one for each peer, which is standard for point-to-point links. 10.10.20.0/30 and 203.0.113.0/30 are both /30 subnets, making them valid choices. 10.10.20.0/24, 192.0.2.0/27, and 172.16.0.0/16 are incorrect because they are not /30 subnets. Azure ExpressRoute has a strict requirement for /30 subnets for peering links.
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