A network engineer needs to connect a Cisco IP phone and a PC in daisy-chain fashion to one switch interface. Data traffic must stay in VLAN 10 and voice traffic in VLAN 20, and the port must remain an access port (not a trunk). Which interface configuration accomplishes this goal on a Catalyst switch running Cisco IOS?
Using the voice-VLAN feature on an access port lets the switch handle two VLANs on one physical interface. The commands switchport mode access, switchport access vlan 10, and switchport voice vlan 20 keep PC frames untagged in VLAN 10 while accepting tagged voice frames in VLAN 20 from the IP phone. Configuring the port as a trunk with a native VLAN also carries both VLANs but violates the requirement for an access port and disables access-port optimizations such as PortFast. BPDU filter changes spanning-tree behavior only, and adding the interface to an EtherChannel aggregates links but does nothing for VLAN separation.
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Cisco CCNA 200-301
Network Access
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