Explanation:
To ensure all 2000 VMs can simultaneously use 128 TCP connections each via Cloud NAT, the total required ports are 2000 * 128 = 256,000. Each NAT IP provides 64,512 ports. For manual allocation, 4 NAT IPs (4 * 64,512 = 258,048 ports) with 128 ports per VM meets the requirement (Option E). In auto-allocation mode, setting the minimum ports per VM to 128 forces Cloud NAT to automatically allocate 4 NAT IPs (Option D). Option A uses insufficient NAT IPs. Option B with two gateways and default ports (64 per VM) falls short. Option C’s default proxy (64 ports per VM) also fails. Thus, D and E are correct.
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Your company has deployed 2000 VMs in a private subnet of your VPC in the us-east1 region. Each VM requires at least 128 concurrent TCP connections to a public repository for downloading software updates and packages over the internet. You must implement a Cloud NAT gateway to enable outbound NAT for these VMs while ensuring all 2000 VMs can simultaneously establish connections. Which two approaches achieve this? (Select two.)
A
Configure the NAT gateway in manual allocation mode, allocate 2 NAT IP addresses, and update the minimum number of ports per VM to 256.
B
Create a second Cloud NAT gateway with the default minimum number of ports configured per VM to 64.
C
Use the default Cloud NAT gateway's NAT proxy to dynamically scale using a single NAT IP address.
D
Use the default Cloud NAT gateway to automatically scale to the required number of NAT IP addresses, and update the minimum number of ports per VM to 128.
E
Configure the NAT gateway in manual allocation mode, allocate 4 NAT IP addresses, and update the minimum number of ports per VM to 128.