Chapter 10 - Layer 2 Switching

Question 1

Remember the three switch functions.

Answer 1

Address learning, forward/ filter decisions, and loop avoidance are the functions of a switch.

Question 2

Remember the command show mac address-table.

Answer 2

The command show mac address-table will show you the forward/ filter table used on the LAN switch.

Question 3

Understand the reason for port security.

Answer 3

Port security restricts access to a switch based on MAC addresses.

Question 4

Know the command to enable port security.

Answer 4

To enable port security on a port, you must first make sure the port is an access port and then use the switchport port-security command at interface level. You can set the port security parameters before or after enabling port security.

Question 5

Know the commands to verify port security.

Answer 5

To verify port security, use the show port-security, show port-security interface interface, and show running-config commands.

Question 6

What command will show you the forward/ filter table?

Answer 6

show mac address-table

Question 7

If a destination MAC address is not in the forward/ filter table, what will the switch do with the frame?

Answer 7

Flood the frame out on all ports except the port on which it was received.

Question 8

What are the three switch functions at layer 2?

Answer 8

Address learning, forward/filter decisions, and loop avoidance.

Question 9

If a frame is received on a switch port and the source MAC address is not in the forward/filter table, what will the switch do?

Answer 9

It will add the source MAC address in the forward/filter table and associate it with the port on which the frame was received.

Question 10

What are the default modes for a switch port configured with port security?

Answer 10

Maximum 1, violation shutdown