Cisco CCNA mock exam questions sample test – Question 146

.The following exhibit displays the MAC address table of a switch in your network, along with the location of each device connected to the switch:

146
Which of the following frames will be flooded to all ports after it is received by the switch?

A. source MAC: 12-34-56-78-9A-BD, destination MAC: 12-34-56-78-9A-BF
B. source MAC: 12-34-56-78-9A-BF, destination MAC: 12-34-56-78-9A-BD
C. source MAC: 12-34-56-78-9A-BF, destination MAC: 12-34-56-78-9A-BC
D. source MAC: 12-34-56-78-9A-BC, destination MAC: 12-34-56-78-9A-BF

Correct Answer: C

Explanation:
The frame with a source MAC of 12-34-56-78-9A-BF and a destination MAC of 12-34-56-78-9A-BC would be sent to all ports because the destination MAC address is not already in
the MAC address table.
The frame with a source MAC of 12-34-56-78-9A-BD and a destination MAC of 12-34-56-78-9A-BF would not be sent to all ports because the destination MAC address is in the MAC
address table.
The frame with a source MAC of 12-34-56-78-9A-BF and a destination MAC of 12-34-56-78-9A-BD would not be sent to all ports because the destination MAC address is in the MAC
address table.
The frame with a source MAC of 12-34-56-78-9A-BC and a destination MAC of 12-34-56-78-9A-BF would not be sent to all ports because the destination MAC address is in the MAC
address table.
Objective:
LAN Switching Fundamentals
Sub-Objective:
Interpret Ethernet frame format
References:
Cisco Press > Articles > Cisco Certification > CCNA Routing and Switching > Basic Data Transmission in Networks: MAC Tables and ARP Tables
How do Switches Work?