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Zorluk: KolayTroubleshooting Routing, Default Gateways, and ACLs

A client computer configured with the IP address 10.0.1.25/2410.0.1.25/24 is unable to access resources on remote networks. An administrator inspects the IP configuration and discovers that the default gateway is set to 10.0.2.110.0.2.1. Which TWO statements accurately describe the cause of this issue and the necessary resolution?

  1. The host cannot communicate with the gateway because the configured default gateway IP address resides on a different subnet.Cevap
  2. B
    The host interface requires a VLAN trunking protocol configuration change to communicate with a gateway on another subnet.
  3. Updating the default gateway address on the host to a valid router interface address within 10.0.1.0/2410.0.1.0/24 will resolve the issue.Cevap
  4. D
    Changing the subnet mask on the host to 255.255.255.255255.255.255.255 (/32) will allow traffic to cross over to the 10.0.2.0/2410.0.2.0/24 gateway.

Cevap

The client computer cannot reach remote networks because its configured default gateway resides on an adjacent subnet rather than its own local IP subnet. Reconfiguring the default gateway address to a valid IP within the local subnet resolves the connectivity failure.
For an IP endpoint to send traffic to external networks, its configured default gateway must be on the same logical IP subnet as the host itself. The host's IP of 10.0.1.25/2410.0.1.25/24 places it on the 10.0.1.0/2410.0.1.0/24 subnet, whereas the configured gateway of 10.0.2.110.0.2.1 resides on the 10.0.2.0/2410.0.2.0/24 subnet. Reconfiguring the host's default gateway address to a router interface within the local 10.0.1.0/2410.0.1.0/24 subnet allows the host to send ARP requests for the gateway and route traffic off the local network.

Adım Adım Çözüm

1
Analyze host IP address and subnet mask.
Host IP 10.0.1.2510.0.1.25 with a /24/24 mask (255.255.255.0255.255.255.0) defines the local subnet range as 10.0.1.110.0.1.1 through 10.0.1.25410.0.1.254.
Determines the boundaries of the host's local broadcast domain and valid local IPs.
2
Evaluate the configured default gateway IP address.
The configured gateway 10.0.2.110.0.2.1 falls outside the local 10.0.1.0/2410.0.1.0/24 subnet.
A host cannot send packets to a default gateway unless the gateway's IP address resides within the host's local subnet.
3
Identify corrective actions to restore routing.
Change the default gateway setting on the host to an active router interface IP within the 10.0.1.0/2410.0.1.0/24 subnet.
Allows the host to resolve the gateway's MAC address using ARP and forward off-network traffic properly.

Anahtar Kavram

Default Gateway Subnet Mismatch
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Konular

Troubleshooting Routing, Default Gateways, and ACLs

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