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The interface FastEthernet0/0 must be configured with an IP address, otherwise it will not work
The LAN interface is configured with a single subnet mask
The interfaces FasthEthernet0/0.10 through 30 are configured as ISL trunks
The subinterfaces on R1 are configured as 802.1q trunks
When configuring VLANs that can support non-proprietary devices, use IEEE 802.1Q instead of ISL (Inter-Switch Link; Cisco Proprietary Protocol). As shown in the exhibit, router R1 is a c3600 series Cisco Router and SW1 is a None-Cisco Switch. (http://www.omnisecu.com/cisco-certified-network-associate-ccna/inter-switch-link-isl-vlan-tagging.php)
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