Chargen protocol uses which UDP port?

Chargen protocol uses which UDP port?

• A. 9
• B. 19
• C. 13
• D. 68

Answer: (B)

Chargen, the Character Generator Protocol, is assigned the well-known port 19 in the IANA registry and can run over both UDP and TCP. This simple protocol sends back a stream of characters to a client, which made it handy for basic network testing in the past, though it’s rarely used today and can be abused for UDP amplification. The other options map to different services—port 9 is the discard service, port 13 is daytime, and port 68 is the BOOTP/DHCP client port—so they’re not Chargen. Therefore, the UDP port for Chargen is 19.

Chargen, the Character Generator Protocol, is assigned the well-known port 19 in the IANA registry and can run over both UDP and TCP. This simple protocol sends back a stream of characters to a client, which made it handy for basic network testing in the past, though it’s rarely used today and can be abused for UDP amplification. The other options map to different services—port 9 is the discard service, port 13 is daytime, and port 68 is the BOOTP/DHCP client port—so they’re not Chargen. Therefore, the UDP port for Chargen is 19.