Correct is A and D.
https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm
The primary vNIC cannot be removed. A floating IP cannot be assigned to a vNIC.
from the same documentation
A given instance can have multiple secondary VNICs, and a given VNIC can have multiple secondary private IPs. So you can assign a given instance multiple public IPs across one or more VNICs if you like.
A & B
Reason for A: You can add secondary VNICs to an instance after it's launched. Each secondary VNIC can be in a subnet in the same VCN as the primary VNIC, or in a different subnet that is either in the same VCN or a different one. However, all the VNICs must be in the same availability domain as the instance.
Reason for B: from oracle documentation: A given instance can have multiple secondary VNICs, and a given VNIC can have multiple secondary private IPs. So you can assign a given instance multiple public IPs across one or more VNICs if you like.
A) is correct because "all the VNICs must be in the same availability domain as the instance"
(https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm)
A y D)
"About Secondary VNICs
You can add secondary VNICs to an instance after it's launched. Each secondary VNIC can be in a subnet in the same VCN as the primary VNIC, or in a different subnet that is either in the same VCN or a different one.
However, all the VNICs must be in the same availability domain as the instance."
https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm
But B is correct.
B)
"Ephemeral Public IPs
Optionally created and assigned during instance launch or secondary VNIC creation. You can create and assign one later if the VNIC doesn't already have one."
https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
That is not true. Ephemeral public ip can be only assigned to primary ip (and a secondary vnic have a primary ip too):
https://docs.oracle.com/en-us/iaas/Content/Network/Tasks/managingIPaddresses.htm#Private_IP_Addresses
Answer is A, B
A - The secondary VNIC must be in the same availability domain as the instance's primary VNIC, so the subnet list includes any regional subnets or AD-specific subnets in the primary VNIC's availability domain. <https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingVNICs.htm>
B - https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm#:~:text=You%20cannot%20move%20an%20ephemeral,IP%20in%20the%20same%20region.
B - When you add a secondary VNIC to an instance, you choose whether the primary private IP on the new VNIC gets an ephemeral public IP. This choice is available only if the secondary VNIC is in a public subnet.
Is not D why? About Secondary VNICs
You can add secondary VNICs to an instance after it's launched. Each secondary VNIC can be in a subnet in the same VCN as the primary VNIC, or in a different subnet that is either in the same VCN or a different one. However, all the VNICs must be in the same availability domain as the instance.
https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
A and B https://docs.cloud.oracle.com/en-us/iaas/Content/Network/Tasks/managingpublicIPs.htm
To assign an ephemeral public IP when creating a secondary VNIC
When you add a secondary VNIC to an instance, you choose whether the primary private IP on the new VNIC gets an ephemeral public IP. This choice is available only if the secondary VNIC is in a public subnet.
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