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Objectives

Not met: A host in VLAN 10 (10.0.10.10) can ping a host in VLAN 20 (10.0.20.10)
Not met: The switch↔router trunk carries both VLAN 10 and VLAN 20

hostname r1
!
! Ethernet1: trunk to the switch (sw1 Ethernet3)
interface Ethernet1
   no shutdown
!
interface Ethernet1.10
   encapsulation dot1q vlan 10
   ip address 10.0.10.1/24
!
interface Ethernet1.20
   encapsulation dot1q vlan 21
   ip address 10.0.20.1/24
!
end

hostname sw1
!
vlan 10
vlan 20
!
! Ethernet1: host-a (10.0.10.10, VLAN 10)
interface Ethernet1
   switchport mode access
   switchport access vlan 10
!
! Ethernet2: host-b (10.0.20.10, VLAN 20)
interface Ethernet2
   switchport mode access
   switchport access vlan 20
!
! Ethernet3: trunk to the router (r1 Ethernet1)
interface Ethernet3
   switchport mode trunk
   switchport trunk allowed vlan 10
!
end

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