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Which devices are required to provide connectivity between VLANs? (Choose two.)
- hub
- router
- bridge
- multilayer switch
- DSU/CSU
Explanation:
Routing between different VLANs can be accomplished using VLAN-capable multilayer switches or routers.
Devices within a single VLAN can communicate without the aid of a Layer 3 device, but as a rule, devices in different VLANs require a Layer 3 device for communication. The only situation where two computers in different VLANs located on different switches can ping one another is if they have addresses in the same subnet, and if the link between the two switches is an access port rather than trunk port.
Since traffic is sent untagged in an access link, if the link between the switches is an access link and the computers are in the same subnet, they will be able to ping one another. The following steps can be used to configure inter-VLAN routing on a multilayer switch:
1. Enable IP routing. switch(config)# ip routing
Note: Routing must be enabled on a Layer 3 switch for interVLAN routing to occur. This can be verified by examining the output of the show run command executed on the switch. The example below is output from the show run command executed on a switch that has IP routing enabled, as can be seen in the third line (ip routing):
2. Specify an IP routing protocol, such as RIP. switch(config)# router rip
3. Specify a VLAN interface. switch(config)# interface vlan vlanid
4. Assign an IP address to the VLAN. switch(config-if)# ip address address subnet-mask
Hubs operate at the Physical layer (Layer 1) and do not have the ability to route.
Bridges operate at the Data Link layer (Layer 2) and do not have the ability to route.
CSU/DSUs convert signals from a LAN to a type necessary for the telco. They do not have the ability to route.
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify trunking
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