A newly created VM is not reachable from other networks, though a ping test works from another VM on the same subnet. What is the MOST likely issue?

A newly created VM is not reachable from other networks, though a ping test works from another VM on the same subnet. What is the MOST likely issue?

• A. Incorrect Subnet
• B. Incorrect Host IP Address
• C. Incorrect VLAN
• D. Incorrect Gateway

Answer: (A)

Subnetting and routing determine whether a machine is reachable beyond its local broadcast domain. If two VMs share the same subnet, they can communicate directly on the local network without routing. But when traffic needs to come from a different network, it must be delivered to the correct subnet by a gateway that knows how to reach that subnet. In this scenario, the VM responds to pings from another VM on the same subnet, so the VM’s IP and ARP path on that local network are fine. The failure to reach the VM from other networks points to how the VM’s subnet is defined relative to the rest of the network. An incorrect subnet (mask or address plan) can make the destination appear to reside on a different network, causing routers to not have a proper route to it or to misroute traffic away from it. Aligning the VM’s subnet mask with the network design ensures that the gateway has a correct route to the VM’s subnet, enabling traffic from other networks to reach it.

Subnetting and routing determine whether a machine is reachable beyond its local broadcast domain. If two VMs share the same subnet, they can communicate directly on the local network without routing. But when traffic needs to come from a different network, it must be delivered to the correct subnet by a gateway that knows how to reach that subnet.

In this scenario, the VM responds to pings from another VM on the same subnet, so the VM’s IP and ARP path on that local network are fine. The failure to reach the VM from other networks points to how the VM’s subnet is defined relative to the rest of the network. An incorrect subnet (mask or address plan) can make the destination appear to reside on a different network, causing routers to not have a proper route to it or to misroute traffic away from it. Aligning the VM’s subnet mask with the network design ensures that the gateway has a correct route to the VM’s subnet, enabling traffic from other networks to reach it.