Which of the following is NOT a valid IPv4 broadcast type?

• A. Limited broadcast 255.255.255.255
• B. Directed broadcast to a specific subnet's broadcast
• C. Local broadcast within a broadcast domain
• D. Global broadcast across the Internet

Answer: (D)

Broadcasting in IPv4 works within scoped areas: you can send to all hosts on the local link, or to all hosts on a specific subnet, but there isn’t a single address that reaches every device on the entire Internet. The limited broadcast address 255.255.255.255 targets all hosts on the local network and isn’t forwarded by routers. A directed broadcast uses the subnet’s broadcast address (for example, a subnet like 192.168.1.0/24 would have 192.168.1.255 as its broadcast) and is delivered within that subnet. Local broadcast within a broadcast domain means the same idea—reaching all hosts in that domain. There is no global broadcast across the Internet, because routers do not propagate broadcasts globally. So the non-existent global Internet broadcast is not a valid IPv4 broadcast type.