You have a Fibre Channel address of 0x341812 and need to determine to which switch it belongs. What is the decimal value of the Domain ID of the switch?

Mateus R.Jun 12, 2026

Think of a Fibre Channel address like a mailing address on an envelope, where the first part is the city, the middle part is the street, and the last part is the house number. In a 24-bit FC address written as 0x341812, the leftmost byte (0x34) is always the Domain ID, which identifies the switch, the middle byte (0x18) is the Area ID, and the rightmost byte (0x12) is the Port ID. You just need to convert that first byte from hex to decimal, so 0x34 becomes 3 times 16 plus 4, which equals 52. The correct answer is D, 52, and the other options will trip you up if you forget to convert from hex or if you accidentally grab the wrong byte out of the address.

Brenda K.Jun 27, 2026

D is right, Domain ID is the top 8 bits, 0x34 = 52 decimal.

Nina C.Jun 16, 2026

Okay so this one got me the first time I saw it because I almost picked C (34) thinking the first byte just was the answer, but that is the hex value, not decimal. The Fibre Channel address 0x341812 breaks into three bytes, and the leftmost byte, 0x34, is the Domain ID. Converting 0x34 to decimal: 3 times 16 is 48, plus 4 is 52, so the answer is D. The options are sneaky because 18, 24, and 34 are all sitting right there in the address itself, which is exactly what I think the question writers wanted you to grab by mistake. On my practice run I actually circled back to this one three times because I kept second-guessing whether the domain was the first or last byte. What helped me lock it in was remembering the mnemonic DAP, Domain, Area, Port, left to right, so the domain is always the high-order byte. When I hit something almost identical on my actual exam, that little word order in my head saved me and I went straight to converting 0x34 without hesitating.