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Refer to the exhibit. The command show ip interface brief has been issued on Router R1. The result is shown in the exhibit, what is true about the interfaces shown in the result?
The switchport of SW1 connecting to FastEthernet0/0 on R1 is a trunked link.
Interface FastEthernet 0/0 has unassigned IP address therefore is not forwarding any traffic.
Router R1 connects to Switch SW1 through five physical Fast Ethernet interfaces.
Interface Serial 0/0 is currently layer 2 protocol non-operational.
To allow inter-VLAN routing communication, a router or a layer 3 switch must be used. To support 802.1Q or ISL encapsulation method for routing on a Fast Ethernet interface the encapsulation must be agreed on both sides. The routers interface is divided into subinterfaces (logical interfaces) for each VLAN. Interface Fast Ethernet 0/0 is divided by four different subinterfaces each with its own subnet mask. If four subinterfaces are configured on router R1 it must be that Switch SW1 has four different VLANs. To forward VLAN information the interface on switch SW1 must be configured as a trunked link. Interface FastEthernet0/0 needs no IP address configured and is operational as long as it has subinterfaces configured. For more information refer to: [http://www.orbit-computer-solutions.com/How-to-Configure-Router-on-a-Stick-InterVLAN-Routing.php]
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