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Cisco Certified Network Associate (CCNA) · Cisco
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Once I had guy from MSP who was building VLANs for VTP on my site on access switches, and forgot to place on production switch "add", lets just say that moment was burned in my brain on how to bring down entire network down during live event.
A will omit VLANs 1,101,102,103 so it's incorrect B will only allow VLAN 104 on the trunk link and will delete the previous configuration so it's incorrect C will allow all VLANs but by doing this we have modified the previous configuration, we need only to allow the VLANs 1,101,102,103 & 104, so it's incorrect D will add VLAN 104 to the allowed VLANs without modifying the previous configuration. so D is the correct answer
A Will allow Vlan 100 To 104 , because 100-104 its range !!! , but will omit vlan 1