Ch 1.4 - Ethernet Lan

Question 1

Packet Components

Answer 1

1. Preamble
2. Start frame delimiter
3. Destination MAC address and source
4. MAC address
5. Length type
6. Data
7. Pad
8. Frame check sequency (CRC)

Question 2

Preamble

Answer 2

Alternating pattern of 1s and 0s used for synchronization

Question 3

Start frame delimiter

Answer 3

Binary 8-bit sequency that indicates start of frame

Question 4

Destination MAC address and source

Answer 4

MAC address of each NIC or network adapter

Question 5

Length/type

Answer 5

Indication of number of bytes in data field if value is less than 1500 Bytes

If greater than 1500 bytes, it indicates type of data format (IP or IPX)

Question 6

Data

Answer 6

The variable length of data bein transferred from the source to the destination

Question 7

Pad

Answer 7

Bring total number of bytes to the minimum of 46 if needed

Question 8

Frame check sequency

Answer 8

4 byte CRC value used for error detection

CRC performed on bits from destination MAC address through the Pad fields

If error is detected, frame is discarded

Question 9

Minimum length of ethernet frame

Answer 9

64 bytes from destination MAC address through frame check sequency

Question 10

Maximum ethernet frame length

Answer 10

1518 bytes.

6bytes (destination MAC) + 6 bytes (Source MAC) + 2 bytes for length/type + 1500 bytes for data