What will happen if a private IP address is assigned to a public interface connected to an ISP?

Question:
What will happen if a private IP address is assigned to a public interface connected to an ISP?

• Addresses in a private range will be not be routed on the Internet backbone.
• Only the ISP router will have the capability to access the public network.
• The NAT process will be used to translate this address to a valid IP address.
• A conflict of IP addresses happens, because other public routers can use the same range.

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