Chapter 5: Analysing Ethernet LAN Switching

Question 1

What 3 actions does a LAN switch take to forward frames

Answer 1

Decides to forward or filter based on destination MAC
Learns MAC addresses based on the source MAC in received frame
Creates loop free environment using STP

Question 2

What information does a switch use to add an entry into its MAC address table?

Answer 2

Source MAC
Interface on which it arrived

Question 3

What action does a switch take when there is no matching entry in its MAC address table?

Answer 3

Forwards the frame out of all interfaces, except the one the frame was received from

Question 4

In what circumstance would a switch flood a frame?

Answer 4

If MAC is broadcast, multicast or unknown destination unicast

Question 5

What command shows the MAC address table containing only dynamically added entries?

Answer 5

show mac-address-table dynamic

Question 6

What does Duplex a-full mean in show interface status?

Answer 6

The interface is funning at full duplex via autonegotiation

Question 7

What port status types can be listed? What could each mean?

Answer 7

connected - port is functional
notconnected - port is down (possible unplugged cable)

Question 8

What memory type does the MAC table use?

Answer 8

Content-Addressable Memory