200-301 Question #1767: Real Exam Question with Answer & Explanation

Question

Lab Simulation 67 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Tasks Task 1 Configure 802.1q trunks between Sw1 and Sw2 on ports E0/0 and E0/1. - Add VLAN 99 as the native VLAN on the trunks. - Only permit VLAN 99 and 110 across the trunks. Task 2 Using LACP, create a Port Channel between Sw1 and Sw2. - Combine E0/0 and E0/1 into a Port Channel while leaving the trunk configurations intact. - Assign number 20. - Both links must negotiate. Answer: The following commands must be applied to both Sw1 and Sw2 to ensure the trunk and Port Channel operate correctly. Task 1: Configure 802.1q Trunks This task configures the interfaces to use 802.1Q tagging, sets the Native VLAN to 99, and limits permitted VLANs. ! --- Configuration for Switch 1 (Sw1) and Switch 2 (Sw2) --- configure terminal interface range Ethernet0/0 - 1 ! Set the trunking standard switchport trunk encapsulation dot1q ! Set the port to permanent trunking mode switchport mode trunk ! Set the Native VLAN as requested switchport trunk native vlan 99 ! Filter and only permit VLAN 99 and 110 switchport trunk allowed vlan 99,110 exit Dot1Q trunking must be enabled on both links. Setting VLAN 99 as the native VLAN and permitting only VLANs 99 and 110 ensures those VLANs traverse the trunk. Task 2: Configure LACP Port Channel This task combines the two physical links (E0/0 and E0/1) into the logical Port Channel 20 using LACP in active mode. ! --- Configuration for Switch 1 (Sw1) and Switch 2 (Sw2) --- interface range Ethernet0/0 - 1 ! Assign the interfaces to Channel Group 20 ! 'mode active' enables LACP and actively initiates negotiation channel-group 20 mode active exit ! Apply the final configuration to the logical interface interface Port-channel 20 ! All trunk configurations (VLAN 99 native, 99/110 allowed) ! are ideally placed here, though they may have been inherited from the physical ports switchport trunk encapsulation dot1q switchport mode trunk switchport trunk native vlan 99 switchport trunk allowed vlan 99,110 exit end copy running-config startup-config LACP requires active mode on both ends for negotiation. The trunking configuration must be moved to the Port Channel interface because the physical members inherit their operational settings from the Port Channel.

Options

• taskConfigure 802.1q trunks between Sw1 and Sw2 on ports E0/0 and E0/1, adding VLAN 99 as the native VLAN and only permitting VLAN 99 and 110 across the trunks. Then, using LACP, create a Port Channel (number 20) between Sw1 and Sw2 by combining E0/0 and E0/1, ensuring both links negotiate and existing trunk configurations are maintained on the Port Channel.
• prerequisites