Mod 4 Inter-VLAN Routing HW
Another VLAN is added to the network shown above, but the router does not have a spare FastEthernet port. What would be the most economical solution?
Configure a trunk link on the switch and subinterfaces on one of the router ports.
What is true about MAC addresses when "router-on-a-stick" is used for inter-VLAN routing?
Each physical Ethernet interface on the router has one MAC address.
Which is true of inter-VLAN routing using "router-on-a-stick"?
Not every router is able to create subinterfaces for VLANs. It depends on the IOS features.
A router is to be added to the configuration shown in the diagram above. This will allow communication between the different VLANs. How many fast ethernet ports will the router need?
One, since trunking can be used.
How are default gateways configured for inter-VLAN routing when "router-on-a-stick" is used?
PCs on different VLANs must be configured with different default gateways.
A router-on-a-stick is configured as follows: R(config)#interface f0/1.2R(config-subif)#encapsulation dot1q 20R(config-subif)#ip add 172.18.0.1 255.255.255.128R(config-subif)#interface f0/1.3R(config-subif)#encapsulation dot1q 30R(config-subif)#ip add 172.18.0.161 255.255.255.224R(config-subif)#interface f0/1.4R(config-subif)#encapsulation dot1q 40R(config-subif)#ip add 172.18.0.193 255.255.255.224R(config-subif)# interface f0/1R(config-if)#no shutdown The router receives a frame on physical interface f0/1. The destination IP address is 172.18.0.120. What will the router do?
Send the frame out of interface f0/1.2 tagged for VLAN 20.
A trunk link between a router and a switch is carrying traffic for six VLANs. What is a potential problem?
The VLANs are sharing the link's bandwidth and this could create a bottleneck.
What is required to perform router-on-a-stick inter-VLAN routing?
a router that is configured with multiple subinterfaces
An administrator was troubleshooting a router-on-a-stick topology and concluded that the problem was related to the configuration of VLANs on the router subinterfaces. Which two commands can the administrator use in the router to identify the problem?
show running-config show ip interface
What is the problem with the network in the diagram?
This design will not scale well if more VLANs are added.
How many IP addresses must be configured on the router mentioned in the previous question?
Three, one for each VLAN.
