Cisco CCNA mock exam questions sample test – Question 356

.A switch that you manage has three VLANs configured. Its MAC address table is shown below:
Vlan Mac address Type Ports

1 000f.e544.c2b3 dynamic Fa0/10
1 000d.4589.00b8 dynamic Fa0/5
1 00bd.000b.005bb dynamic Fa0/8
11 0001.0d44.bbdb dynamic Fa0/12
55 0014.0bd4.0054 dynamic Fa0/15
66 00bb.224b.0ac5 dynamic Fa0/1
You execute the following command on the switch:
Switch# show int trunk
Port mode Encapsulation Status Native VLAN
Fa0/10 on 802.1q trunking 1
Fa0/5 on 802.1q trunking 1
Fa0/8 on 802.1q trunking 1
Considering only the ports listed in the output, if a frame enters the switch untagged with a destination address of 0002.254b.0015, which ports will receive the frame? (Choose all that

A. All ports
B. Ports 5, 8, and 11
C. All unaccounted-for access ports
D. All ports in the same VLAN except the port on which it arrived
E. All 802.1q trunk links

Correct Answer: DE

When a switch receives a frame, the first thing it will do is determine if the frame’s MAC address is already in its MAC table. If it is not, as in this scenario, it will send the frame out on
all access ports in the same VLAN and any 802.1q trunks with the exception of the port on which it arrived. Since the frame is untagged it will be in VLAN 1 by default.
In the MAC table shown in the output, there is no listing for the MAC address 0002.254b.0015. This indicates that the destination is not directly connected to this switch. Therefore, the
switch will send the frame to all trunk links, which in this case would be ports 10, 5, and 8, and all access links in VLAN 1 with the exception of the one on which it arrived, which was
not identified in the scenario.
LAN Switching Fundamentals
Describe and verify switching concepts