Question

an identifying number that is coded into a devices nic and cannot be changed is the: ipv4 address ipv6 address mac address port address

Explanation:

To solve this, we analyze each option:

• IPv4/IPv6 addresses are network layer addresses and can be changed.
• A MAC (Media Access Control) address is a unique identifier coded into a device's NIC (Network Interface Card) and is fixed (cannot be changed by default).
• A port address is used for identifying applications/services and is not coded into the NIC.

So the correct option is the one related to MAC address.

Answer:

C. MAC address (assuming the options are labeled A: IPv4 address, B: IPv6 address, C: MAC address, D: port address; if labels differ, adjust but the correct content is "MAC address" as the option with that text)