Week 10 Quiz

Question 1

An Ethernet interface attached to a switch will forward

Answer 1

all frames that match the MAC address learnt on that interface and broadcast/multicast frames and frames for which the switch has not yet learned the destination.

Question 2

How are broadcast messages signalled on Ethernet networks

Answer 2

The destination MAC address is FF:FF:FF:FF:FF:FF

Question 3

How do Ethernet switches know which ports to forward unicast frames on

Answer 3

The switch watches the source addresses of transmitted frames and learn where interfaces are connected

Question 4

On an Ethernet II (DIX) frame, what does the Ethertype signify

Answer 4

The protocol of the payload

Question 5

What do the first three bytes of an Ethernet MAC address normally signify

Answer 5

The manufacturer of the interface hardware

Question 6

What happens when promiscuous mode is enabled on an Ethernet interface

Answer 6

The interface will receive all frames and pass them to the OS

Question 7

What is the minimum length of an Ethernet frame, including the header and CRC but not the preamble

Answer 7

64 bytes

Question 8

When a frame is forwarded to an Ethernet interface the interface will

Answer 8

process the frame and forward it to the operating system if it passes error checking and it matches an address the interface is programmed to receive

Question 9

Which frames will an Ethernet interface receive and pass to the operating system by default?

Answer 9

All frames with the destination address equal to the MAC address of the interface or the broadcast address