Module 4: Inter-VLAN Routing

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Last updated 1:36 AM on 9/21/26
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30 Terms

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Inter-VLAN routing
The process of forwarding network traffic from one VLAN to another VLAN.
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Legacy Inter-VLAN routing
An inter-VLAN solution using a router with multiple physical Ethernet interfaces; limited by physical port capacity.
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Router-on-a-Stick
An inter-VLAN routing method using one physical router interface configured as an 802.1Q trunk with multiple subinterfaces.
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50 VLANs
The maximum number of VLANs that the router-on-a-stick method can scale to before becoming inefficient.
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Layer 3 switch
Also called a multilayer switch; provides the most scalable inter-VLAN routing using hardware-based switching.
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SVI
A switched virtual interface configured on a Layer 3 switch to perform routing functions for a VLAN.
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Subinterfaces
Software-based virtual interfaces associated with a single physical Ethernet interface on a router.
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interface vlan vlan-id
Creates a management SVI on a Layer 2 switch or a routing SVI on a Layer 3 switch.
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ip default-gateway
Configures the default gateway on a Layer 2 switch.
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switchport mode access
Configures a switch port as an access port.
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switchport access vlan vlan-id
Assigns an access port to a specific VLAN.
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switchport mode trunk
Configures a switch port as a trunk link.
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interface interface_id subinterface_id
Creates a virtual subinterface on a router to facilitate logical routing.
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encapsulation dot1q vlan_id
Configures a router subinterface to respond to 802.1Q encapsulated traffic for a specific VLAN.
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native keyword
Appended to the encapsulation dot1q command to set the native VLAN to something other than VLAN 1.
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ip address ip-address subnet-mask
Configures the IPv4 address of an interface, which typically serves as the default gateway for a VLAN.
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no shutdown
Enables a physical interface, which in turn enables all of its configured subinterfaces.
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ipconfig
A Windows host command used to verify the current host IP configuration.
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ping
A command used to verify network connectivity between hosts in different VLANs.
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show ip route
A command used to verify the routing table.
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show ip interface brief
A command used to verify interface and subinterface status and IPv4 addresses.
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show interfaces trunk
A command used to verify which switch ports are operating as trunk links.
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Routed port
A Layer 2 switchport that has been converted to a Layer 3 interface to connect to a router or another Layer 3 switch.
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ip routing
A global configuration command required to enable inter-VLAN routing on a Layer 3 switch.
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no switchport
An interface configuration command used to convert a Layer 2 switchport into a Layer 3 routed port.
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Inactive
The operational state of a switch port when its assigned VLAN is deleted.
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show interface interface-id switchport
A command used to verify the administrative mode, operational mode, and VLAN membership of a specific port.
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show running-config interface
A command used to examine the specific configuration of an interface.
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show vlan brief
A command used to verify which access ports are assigned to which VLANs.
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include
An IOS command filter keyword used to reduce command output to only lines containing specific text.