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Refer to the exhibit. A router with 3 FastEthernet Interfaces is routing the traffic for three different VLANs. The network administrator wants to configure a new VLAN, but there are no more interfaces available on the router. What is the best and cheapest solution to expand?
Configure 4 VLANs on each Switch.
Connect SW1 and SW3 to SW2 and configure IP for routing.
Change the router for a Layer 3 Switch.
Change the router to one with more capability.
Change to one physical interface with 4 subinterfaces.
Subinterfaces are basically logical interfaces created on a physical interface. A subinterface can be configured on a router using only two commands on the Fast Ethernet port. The best solution for this case is to use only one physical interface from any switch, span the switches with trunk links and configure 4 subinterfaces, one for each VLAN. For more information refer to: http://www.orbit-computer-solutions.com/How-to-configure-Inter-VLAN-Routing-on-Cisco-router.php
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