SRWE MODULE 4: INTER-VLAN ROUTING | COMPLETE PRACTICE QUESTIONS,
ANSWERS & STUDY GUIDE 2026/2027
Define inter-vlan routing. - ANS ✔✔- the process of forwarding network traffic from on VLAN to another
VLAN
What are the 3 inter-VLAN routing options? - ANS ✔✔- Legacy Inter-VLAN routing (no longer used in
switched networks)
+ used a router with each router interface connected to a switch port in different VLAN
+ doesn't scale well, because requiring one physical router interface per VLAN quickly exhausts the
physical interface capacity of a router
- Router-on-a-Stick
+ acceptable for small to medium-sized network, (up to 50 LANs)
+ routes based on multiple virtual subinterfaces within a single router interface, configured as a trunk, to
route traffic between multiple VLANs on a network
+ virtual subinterfaces have their own distinct IP address/VLAN ID, with VLAN assignments
corresponding to subnets
+ router sees the destination IP, sends to the appropriate exit interface, and tags the data frames with
the new VLAN and send it out the physical interface
- Layer 3 switch using SVIs (switch virtual interfaces)
+ modern way of doing inter-VLAN routing
+ most scalable solution for medium to large organizations
+ use hardware-based switching to achieve higher-packet processing rates than routers
What is a Layer 3 switch? - ANS ✔✔- aka multilayer switch
- operates at Layer 2 and Layer 3
What is the role of an inter-VLAN SVI? - ANS ✔✔- provides Layer 3 processing for packets that are sent to
or from all switchports associated with that VLAN
To use a router as a router-on-a-stick, you must create subinterfaces as the gateways for VLAN hosts.
What are the 3 is the command used to 1) create a subinterface on a router for a VLAN, 2) configure the
subinterface to respond to traffic from that VLAN, and 3) give the IP address of the subinterface? - ANS
✔✔- "interface interface_id.subinterface_id" (ex. "interface G0/0/1.10"
+ with the subinterface number customarily matching the VLAN number
- "encapsulation dot1q vlan_id [native]" (ex. "encapsulation dot1Q 10" if a VLAN of 10
+ "native" only added to change the native VLAN to something other than VLAN 1
+ "no encapsulation dot1q" to delete an incorrect subinterface-to-vlan association
- "ip address ip-address subnet-mask" (ex. ip add 192.168.10.1 255.255.255.0)
ANSWERS & STUDY GUIDE 2026/2027
Define inter-vlan routing. - ANS ✔✔- the process of forwarding network traffic from on VLAN to another
VLAN
What are the 3 inter-VLAN routing options? - ANS ✔✔- Legacy Inter-VLAN routing (no longer used in
switched networks)
+ used a router with each router interface connected to a switch port in different VLAN
+ doesn't scale well, because requiring one physical router interface per VLAN quickly exhausts the
physical interface capacity of a router
- Router-on-a-Stick
+ acceptable for small to medium-sized network, (up to 50 LANs)
+ routes based on multiple virtual subinterfaces within a single router interface, configured as a trunk, to
route traffic between multiple VLANs on a network
+ virtual subinterfaces have their own distinct IP address/VLAN ID, with VLAN assignments
corresponding to subnets
+ router sees the destination IP, sends to the appropriate exit interface, and tags the data frames with
the new VLAN and send it out the physical interface
- Layer 3 switch using SVIs (switch virtual interfaces)
+ modern way of doing inter-VLAN routing
+ most scalable solution for medium to large organizations
+ use hardware-based switching to achieve higher-packet processing rates than routers
What is a Layer 3 switch? - ANS ✔✔- aka multilayer switch
- operates at Layer 2 and Layer 3
What is the role of an inter-VLAN SVI? - ANS ✔✔- provides Layer 3 processing for packets that are sent to
or from all switchports associated with that VLAN
To use a router as a router-on-a-stick, you must create subinterfaces as the gateways for VLAN hosts.
What are the 3 is the command used to 1) create a subinterface on a router for a VLAN, 2) configure the
subinterface to respond to traffic from that VLAN, and 3) give the IP address of the subinterface? - ANS
✔✔- "interface interface_id.subinterface_id" (ex. "interface G0/0/1.10"
+ with the subinterface number customarily matching the VLAN number
- "encapsulation dot1q vlan_id [native]" (ex. "encapsulation dot1Q 10" if a VLAN of 10
+ "native" only added to change the native VLAN to something other than VLAN 1
+ "no encapsulation dot1q" to delete an incorrect subinterface-to-vlan association
- "ip address ip-address subnet-mask" (ex. ip add 192.168.10.1 255.255.255.0)
