M2Q3: Bits, Bytes, and Ethernet Frames

Question 1

How many bits are in a Byte?

A. 32
B. 8
C. 48
D. 12

Answer 1

B. 8

Explanation: There are 8 bits in a Byte.

Question 2

Select the correct short form of representing the data rate of 1 bit per second.

A. 1 MB
B. 1Bps
C. 1 bit
D. 1bps

Answer 2

D. 1bps

Explanation: The short form a bits per second is bps. When you see a lowercase “b” is always means bits. When you see an upper case “B” is always represents Bytes.

Question 3

Bytes use a lower case b in the shorthand notation.

A. True
B. False

Answer 3

B. False

Explanation: bits uses the lowercase “b” while Bytes uses the uppercase “B”.

Question 4

An ordinary Frame payload is how many Bytes in length?

A. 1500
B. 9000
C. 1000
D. 500

Answer 4

A. 1500

Explanation: The standard maximum payload of an Ethernet Frame is 1500 Bytes. With overhead such as the MAC Header, VLAN tag and CRC a standard Frame can exceed 1500 Bytes, however the actual payload (which contains the data) is still a maximum of1500 Bytes.

Question 5

Frames are created in the Network Interface Card (NIC).

A. True
B. False

Answer 5

A. True

Explanation: The Network Interface Card is where Frames are assembled before being placed on the network media and disassembled after being retrieved from the network media.

Question 6

How many bits are there in 512 Bytes.

A. 1024b
B. 2048b
C. 4096b
D. 8192b

Answer 6

C. 4096

Explanation: To find the number of bits in a certain number of Bytes simply multiply the number of Bytes times eight (512 * 8 = 4096). To perform the reverse is to find the number bytes in a certain number of bits. In that case simply divide the number of bits by eight (4096 bits / 8 = 512 Bytes)