A network technician is provisioning a new telemetry server at a branch office. The server is assigned the IPv4 address . Local testing shows that the server cannot reach external network services or ping its configured gateway. A review of the network configuration details reveals:
- Server IP Address:
- Subnet Mask: ()
- Default Gateway:
- Router Interface IP:
Which of the following identifies the root cause of the connectivity failure?
- The default gateway IP address resides on a different IP subnet than the server's configured address.Answer
- BThe host IP address 192.168.48.150 is reserved as the broadcast address for the /25 network.
- CAn access control list on the router is dropping traffic due to an implicit deny rule.
- DThe host and router are on different VLANs and require a Spanning Tree protocol update to communicate.
Answer
The server's configured default gateway address resides on a different IP subnet than the host address itself.
A host device requires its default gateway IP address to reside within the same local IP subnet so it can discover the gateway's MAC address via ARP. With a /25 subnet mask (255.255.255.128), the network is split into two subnets: 192.168.48.0/25 (192.168.48.0 - 192.168.48.127) and 192.168.48.128/25 (192.168.48.128 - 192.168.48.255). The server's IP address (192.168.48.150) is in the second subnet, while the default gateway (192.168.48.1) is in the first subnet. Because they are on separate subnets, the host cannot route traffic to external destinations.
Step-by-Step Solution
Key Concept
Default Gateway Subnet Alignment
Estimated Time:1m 30s