A network technician is troubleshooting a connectivity issue where a host with IP address 192.168.10.15/24 cannot communicate with servers on remote networks. Which TWO of the following issues are the most likely causes of this communication failure?
- The default gateway address on the host is set to 192.168.20.1, placing it on a different subnet than the host.Cevap
- An Access Control List (ACL) applied to the router's outbound interface lacks an explicit permit rule for the host's subnet and drops traffic due to the implicit deny.Cevap
- CThe host and default gateway router interface are assigned to the same VLAN, preventing Layer 3 routing operations.
- DThe destination web service uses TCP port 443, but network devices require TCP port 80 for all encrypted communications.
Cevap
The two correct causes are assigning a default gateway on a different subnet than the host (192.168.20.1 vs 192.168.10.0/24) and an Access Control List (ACL) blocking traffic via its implicit deny rule.
For a host to communicate outside its local subnet, its default gateway must be on the exact same local IP subnet so the host can resolve the gateway's MAC address. Additionally, any Access Control List (ACL) along the path must explicitly permit the traffic, otherwise the implicit deny rule at the end of the ACL will silently drop the packets.
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Troubleshooting Routing, Default Gateways, and ACLs