Check Your Understanding Questions
Complete all the review questions listed here to test your understanding of the sections and concepts in this chapter. The appendix “Answers to the ‘Check Your Understanding’ Questions” lists the answers.
1. A router has two FastEthernet interfaces and needs to connect to four VLANs in the local network. How can this be accomplished using the fewest number of physical interfaces without unnecessarily decreasing network performance?
Add a second router to handle the inter-VLAN traffic.
Implement a router-on-a-stick configuration.
Interconnect the VLANs via the two additional FastEthernet interfaces.
Use a hub to connect the four VLANS with a FastEthernet interface on the router.
2. What distinguishes traditional legacy inter-VLAN routing from router-on-a-stick?
Traditional routing is able to use only a single switch interface, whereas a router-on-a-stick can use multiple switch interfaces.
Traditional routing requires a routing protocol, whereas a router-on-a-stick only needs to route directly connected networks.
Traditional routing uses one port per logical network, whereas a router-on-a-stick uses subinterfaces to connect multiple logical networks to a single router port.
Traditional routing uses multiple paths to the router and therefore requires STP, whereas router-on-a-stick does not provide multiple connections and therefore eliminates the need for STP.
3. Subinterface G0/1.10 on R1 must be configured as the default gateway for the VLAN 10 192.168.10.0/24 network. Which command should be configured on the subinterface to enable inter-VLAN routing for VLAN 10?
encapsulation dot1q 10
encapsulation vlan 10
switchport mode access
switchport mode trunk
4. What is important to consider while configuring the subinterfaces of a router when implementing inter-VLAN routing?
The IP address of each subinterface must be the default gateway address for each VLAN subnet.
The no shutdown command must be given on each subinterface.
The physical interface must have an IP address configured.
The subinterface numbers must match the VLAN ID number.
5. What are the steps that must be completed in order to enable inter-VLAN routing using router-on-a-stick?
Configure the physical interfaces on the router and enable a routing protocol.
Create the VLANs on the router and define the port membership assignments on the switch.
Create the VLANs on the switch to include port membership assignment and enable a routing protocol on the router.
Create the VLANs on the switch to include port membership assignment and configure subinterfaces on the router matching the VLANs.
6. What two statements are true regarding the use of subinterfaces for inter-VLAN routing? (Choose two.)
Fewer router Ethernet ports required than in traditional inter-VLAN routing
Less complex physical connection than in traditional inter-VLAN routing
More switch ports required than in traditional inter-VLAN routing
Simpler Layer 3 troubleshooting than with traditional inter-VLAN routing
Subinterfaces have no contention for bandwidth
7. Which router-on-a-stick command and prompt on R1 correctly encapsulates 802.1Q traffic for VLAN 20?
R1(config-if)# encapsulation 802.1q 20
R1(config-if)# encapsulation dot1q 20
R1(config-subif)# encapsulation 802.1q 20
R1(config-subif)# encapsulation dot1q 20
8. What are two disadvantages of using the router-on-a-stick inter-VLAN routing method in a large network? (Choose two.)
A dedicated router is required.
It does not scale well.
It requires multiple physical interfaces on a router.
It requires subinterfaces to be configured on the same subnets.
Multiple SVIs are needed.
9. What is a characteristic of a routed port on a Layer 3 switch? (Choose two.)
It requires the switchport mode access interface config command.
It requires the no switchport interface config command.
It requires the switchport access vlan vlan-id interface config command.
It supports trunking.
10. What are two advantages of using a Layer 3 switch with SVIs for inter-VLAN routing? (Choose two.)
A router is not required.
It switches packets faster than using the router-on-a-stick method.
SVIs can be bundled into EtherChannels.
SVIs can be divided using subinterfaces.
SVIs eliminate the need for a default gateway in the hosts.