Ethernet

Question 1

What is the maximum size of an Ethernet frame according to the IEEE 802.3ac standard?

Answer 1

1552 bytes

Question 2

What is the minimum size of an Ethernet frame?

Answer 2

64 bytes

Question 3

What does a receiving device do if it receives a frame that is less than the allowed minimumsize or greater than the allowed maximum size?

Answer 3

The receiving device drops the frame.

Question 4

How does a recipient device know if the sender used the Length/Type field to specify a length or a type

Answer 4

If the value is equal to or greater than 0x0600, the field specifies a type.

Question 5

Why is padding sometimes added to the data part of an Ethernet frame?

Answer 5

To ensure that the frame is at least 64 bytes

Question 6

What happens if a frame arrives damaged?

Answer 6

The recipient calculates a CRC that differs from the CRC in the FCS field and drops the frame

Question 7

How long is a MAC address?

Answer 7

48 bytes

Question 8

Compare and contrast MAC addresses with IP addresses

Answer 8

h

Question 9

Compare and contrast unicast,broadcast,and multicast communications at the MAC sublayer.

Answer 9

h

Question 10

What is interframe spacing,and why does Ethernet use it?

Answer 10

Interframe spacing is the required time between frames on an Ethernet network. After a frame has been sent, all devices are required to wait a min of 96 bits times. This gives the medium time to stabilize after transmitting a frame.

Question 11

What is a basic job of ARP?

Answer 11

Resolve IPv4 address to MAC address

Question 12

If a node has recently sent a frame to another node,where is the mapping of IPv4 address toMAC address stored?

Answer 12

ARP cache

Question 13

What type of header does an ARP frame contain?

Answer 13

Ethernet

Question 14

What is the destination address in the frame when a node sends an ARP request to find theMAC address associated with a known IP address?

Answer 14

FF:FF:FF:FF:FF:FF

Question 15

What are three functions of the upper data link sublayer in the OSI model?

Answer 15

• identifies the network layer protocol
• makes the connection with the upper layers
• insulates network layer protocols from changes in physical equipment.

Question 16

What three primary functions does data link layer encapsulation provide?

Answer 16

• addressing
• error detection
• frame delimiting

Question 17

Which two features make switches preferable to hubs in Ethernet-based networks?

Answer 17

• minimizing of collisions

- increase in thoughput of communications

Question 18

When a collision occurs in a network using CSMA/CD, how do hosts with data to transmit respondafter the backoff period has expired

Answer 18

The hosts return to a listen-before-transmit mode

Question 19

Ethernet operates at which layers of the OSI model?

Answer 19

• Physical layer

- Data-link layer

Question 20

Which of the following describe interframe spacing?

Answer 20

• the minimum interval, measured in bit-times, that any station must wait before sendinganother frame.
• time allowed for slow stations to process a frame and prepare for the next frame

Question 21

What does the IEEE 802.2 standard represent in Ethernet technologies?

Answer 21

Logical Link Control sublayer