Refer to the exhibit. Switch AccSw1 has just been added to the network along with PC2. All VLANs have been implemented on AccSw2. How must the ports on AccSw2 be configured to establish Layer 2 connectivity between PC1 and PC2?
I imagine that the confusion is the "switchport trunk allowed VLAN 11, 12" command in option C.
Please note that this just a distraction.
As you may have learnt already when you apply the "switchport mode trunk" on an interface it allows all VLANs by default. So by using this command in option B all VLANs 1 - 4094 are allowed over the trunk.
For security reasons, during our network design we tend to remove all vlans and only allow the vlans we desire.
If we apply the command in option C "switchport trunk allowed VLAN 11, 12" it would delete all vlans and only allow VLANs 11 and 12. This means that all other devices or departments who are dependent on this trunk will be cut-off.
One of the biggest blunders sometimes made by beginners is to delete an entire VLAN by overwriting it. Always remember to use the "add" command when adding new VLANs to a trunk already configured for other VLANs.
Reference page 5 in the Cisco document
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst_digital_building_series_switches/software/15-2_5_ex/configuration_guide/b_1525ex_consolidated_cdb_cg/b_1525ex_consolidated_cdb_cg_chapter_0110101.pdf&ved=2ahUKEwjtxrDFlO_6AhW-ADQIHZk1B6QQFnoECA8QBQ&usg=AOvVaw1HVa1ltIBL8EHVJI_H7g8b
All true, but the question only mentions connectivity between devices in VLAN 11, so B and C both achieve this.
I agree B is the better answer, though.
GigabitEthernet1/1 is configured as an access port in VLAN 11, which matches the VLAN assigned to the Staff PCs.
GigabitEthernet1/24 is configured as a trunk port, allowing VLANs 11 and 12 to pass through, ensuring proper communication across the switches.
This configuration ensures that the Staff PCs on VLAN 11 can communicate with each other while also allowing VLAN 12 traffic to pass through the trunk link.
The question was: how to establish Layer 2 connectivity between PC1 and PC2. So answer C is also correct since the connecion between this two specified host will work just fine.
You would not need to allow vlan 12 on the trunk to support a connection between two work stations. Both pc's are in the same VLAN. I believe the answer would be B
IF you use that command only vlan 11, 12 will be allowed on the trunk. the command override the command "switchport mode trunk"
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