Refer to the exhibit. A new layer 2 switch "SW1" is set up and two VLANs are configured. **Why is it not possible for PC-1 to ping PC-2?** No exhibit given. Answer is "A Layer-2 Switch cannot interconnect hosts in different VLANs without the use of a Router-on-a stick"

Refer to the exhibit. A new layer 2 switch "SW1" is set up and two VLANs are configured.
Why is it not possible for PC-1 to ping PC-2?
No exhibit given. Answer is "A Layer-2 Switch cannot interconnect hosts in different VLANs without the use of a Router-on-a stick"

Switch SW1 belongs to Native VLAN.

There is no VLAN interface on the SW1 with an IP.

A Layer-2 Switch cannot interconnect hosts in different VLANs without the use of a Router-on-a stick

By default SW1 is configured in the Administrative VLAN.

Explanation

A Switch layer 2 is not capable to support layer 3 addresses to be configured on its ports. A native VLAN or Administrative VLAN is the untagged VLAN, and is by default configured on all switches. In this network, VLAN15, VLAN11 and VLAN 1 exist on the Switch SW1. - - - - - - - - - - - - - - - - Separate VLANs are also in separate IP-Subnets. So for hosts on these 2 VLANs to communicate you would need to add either: a Router-on-a-Stick(ROS) with Subinterfaces (dot1q-encap) for each VLAN/Subnet, -or- you would need a Layer-3 Switch using SVI's. - - - - - - - - - - - - - - - - Make sure you know how to configure both ROS & L3-SVI's for the CCNA exam, they are both current Exam objectives, and after you learn and PRACTICE them a few times, they are pretty simple to setup and troubleshoot. [Good-Luck!] - - - {enhanced question & explanation 20151221-zgz}