MAC address format

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Quick Questions

Shade in the A or B circle for each question.

1. Which is a correctly formatted MAC address?

A 00:1A:2B:3C:4D:5E

B 00:1A:2B:3C:4D

2. How many bits are in a MAC address?

A 32 bits

B 48 bits

3. How many hex digits are in each pair of a MAC address?

A Two hex digits per pair

B Three hex digits per pair

4. Which separators can be used in a MAC address?

A Colons (:) or hyphens (-)

B Full stops (.) or colons (:)

5. Which MAC address is written correctly using hyphens?

A 00-1A-2B-3C-4D-5E-6F

B 00-1A-2B-3C-4D-5E

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
100:1A:2B:3C:4D:5E		AA MAC address written as six pairs of hex digits separated by colons
200-1A-2B-3C-4D-5E		B3C
3Each pair in a MAC address is two hex digits, so it can range from 00 to FF		CG is not a hex digit. Hex digits are only 0 to 9 and A to F, so the last pair is invalid.
4A MAC address has six pairs of two hex digits, which is 6 x 8 = 48 bits in total		DThe same kind of MAC address written with hyphens as separators instead of colons
500:1A:2B:3C:4D		EOnly five pairs are shown. A MAC address needs six pairs of hex digits (48 bits), so one pair is missing.
600:1A:2B:3C:4D:5G		FA4:5E:60:D2:19:7B

Definitions

00:1A:2B:3C:4D:5E

Fill in the Blanks

Complete each line of code by filling in the missing parts.

A MAC address has _ pairs of hex digits.

Each pair in a MAC address has _ hex digits.

A MAC address is __ bits in total.

00_1A-2B-3C-4D-5E

6 pairs x _ bits per pair = 48 bits

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A mac = "00:1A:2B:3C:4D:5E"

B pairs = mac.split("-")

C print(len(pairs))

Question 2

A pairs = 8

B per_pair = 2

C total = pairs * per_pair

D print(total)

Question 3

A pairs = 6

B digits = pairs * 2

C bits = digits * 4

D print("Bits:", digits)

Question 4

A mac = "00-1A-2B-3C-4D-5E"

B ok = len(mac) == 12

C print(ok)

Question 5

A mac = "A4-C3-F0-85-12"

B parts = mac.split("-")

C print(parts[0])

Answer Key

MAC address format

Section A: Quick Questions

A — 00:1A:2B:3C:4D:5E

B — 48 bits

A — Two hex digits per pair

A — Colons (:) or hyphens (-)

B — 00-1A-2B-3C-4D-5E

Section B: Match the Pairs

00:1A:2B:3C:4D:5E → A MAC address written as six pairs of hex digits separated by colons

00-1A-2B-3C-4D-5E → The same kind of MAC address written with hyphens as separators instead of colons

Each pair in a MAC address is two hex digits, so it can range from 00 to FF → 3C

A MAC address has six pairs of two hex digits, which is 6 x 8 = 48 bits in total → A4:5E:60:D2:19:7B

00:1A:2B:3C:4D → Only five pairs are shown. A MAC address needs six pairs of hex digits (48 bits), so one pair is missing.

00:1A:2B:3C:4D:5G → G is not a hex digit. Hex digits are only 0 to 9 and A to F, so the last pair is invalid.

Section C: Definitions

00:1A:2B:3C:4D:5E — A MAC address is six pairs of hex digits (two digits per pair, 48 bits in total), separated by colons or hyphens, such as 00:1A:2B:3C:4D:5E.

Section D: Fill in the Blanks

A MAC address has 6 pairs of hex digits.

Each pair in a MAC address has 2 hex digits.

A MAC address is 48 bits in total.

00-1A-2B-3C-4D-5E

6 pairs x 8 bits per pair = 48 bits

Section E: Spot the Error

B — This MAC address uses colons as separators, so it must be split on ":". Splitting on "-" would leave the whole address as one piece. It should be pairs = mac.split(":").

A — A MAC address has six pairs of hex digits, not eight. It should be pairs = 6, which gives 12 hex digits in total.

D — The program should print the number of bits (48), not the number of hex digits (12). It should be print("Bits:", bits).

B — The text has 12 hex digits plus 5 hyphen separators, so its length is 17, not 12. It should be ok = len(mac) == 17.

A — This MAC address has only five pairs. A valid MAC address needs six pairs of hex digits, so a sixth pair such as -9B is missing.