200-301: Cisco Certified Network AssociateDemo

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QuestionQ998

Network Access

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Refer to the exhibit. An engineer is configuring a new Cisco switch, NewSW, to replace SW2. The following details are provided:

  • Switches SW1 and SW2 are third-party devices without support for trunk ports.
  • The existing connections between PC1, PC2, and PC3 must be maintained.
  • The switch must be allowed to pass traffic for future VLAN 10.

Which configuration must be applied?

  • A NewSW(config)#interface f0/0 NewSW(config-if)#switchport mode trunk NewSW(config-if)#switchport trunk native vlan 10 NewSW(config-if)#switchport trunk native vlan 10
  • B NewSW(config)#interface f0/0 NewSW(config-if)#switchport mode access NewSW(config-if)#switchport trunk allowed vlan 2, 10 NewSW(config-if)#switchport trunk native vlan 2
  • C NewSW(config)#interface f0/0 NewSW(config-if)#switchport mode access NewSW(config-if)#switchport trunk allowed vlan 2, 10 NewSW(config-if)#switchport trunk native vlan 10
  • D NewSW(config)#interface f0/0 NewSW(config-if)#switchport mode trunk NewSW(config-if)#switchport trunk allowed vlan 2, 10 NewSW(config-if)#switchport trunk native vlan 2
Explanation

Since the adjacent switches do not support trunking, NewSW must interoperate using an access-mode link for VLAN 2. However, to also accommodate future VLAN 10 traffic, NewSW can be configured as a trunk with VLAN 2 as the native VLAN and both VLANs 2 and 10 allowed. Untagged frames from the non-trunking switches map to the native VLAN 2, while the trunk infrastructure permits future VLAN 10 expansion.

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