Chapter 5

Question 1

Shows all MAC table entries of all types

Answer 1

show mac address-table

Question 2

Shows all dynamically learned MAC table entries

Answer 2

show mac address-table dynamic

Question 3

Shows all dynamically learned MAC table entries in that VLAN

Answer 3

show mac address-table dynamic vlan vlan-id

Question 4

Shows the dynamically learned MAC table entries with that MAC address

Answer 4

show mac address-table dynamic address mac-address

Question 5

Shows all dynamically learned MAC table entries associated with that interface

Answer 5

show mac address-table dynamic interface interface-id

Question 6

Shows the number of entries in the MAC table and the total number of remaining empty slots in the MAC table

Answer 6

show mac address-table count

Question 7

Shows the global and per-VLAN aging timeout for inactive MAC table entries

Answer 7

show mac address-table aging-time

Question 8

Lists packet counters for the listed interface ID

Answer 8

show interfaces id counters

Question 9

Lists one line per interface on the switch, with basic status and operating/ information for each

Answer 9

show interfaces status

Question 10

Clears (removes) dynamic MAC table entries: either all (with no parameters), or a subset based on VLAN ID, interface ID, or a specific MAC address

Answer 10

clear mac address-table dynamic [vlan vlan-number] [interface interface-id] [address mac-address]

Question 11

Note that this chapter also includes reference to one configuration command, so it does not call for the use of a separate table.

Answer 11

For review, the command is
mac address-table aging-time time-in-seconds [vlan vlan-number]

Question 12

An Ethernet frame sent to destination address FFFF.FFFF.FFFF, meaning that the frame should be delivered to all hosts on that LAN.

Answer 12

broadcast frame

Question 13

The result of the LAN switch forwarding process for broadcasts and unknown unicast frames. Switches forward these frames out all interfaces, except the interface in which the frame arrived. Switches also flood multicasts by default, although this behavior can be changed.

Answer 13

flood/flooding

Question 14

To send a frame received in one interface out another interface, toward its ultimate destination.

Answer 14

forward

Question 15

An Ethernet frame whose destination MAC address is listed in a switch’s MAC address table, so the switch will forward the frame out the one port associated with that entry in the MAC address table.

Answer 15

known unicast frame

Question 16

A table of forwarding information held by a Layer 2 switch, built dynamically by listening to incoming frames and used by the switch to match frames to make decisions about where to forward the frame.

Answer 16

MAC address table

Question 17

A protocol defined by IEEE standard 802.ID. Allows switches and bridges to create a redundant LAN, with the protocol dynamically causing some ports to block traffic, so that the bridge/switch forwarding logic will not cause frames to loop indefinitely around the LAN.

Answer 17

Spanning Tree Protocol (STP)

Question 18

An Ethernet frame whose destination MAC address is not listed in a switch’s MAC address table, so the switch must flood the frame.

Answer 18

unknown unicast frame