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Question

Difficulty: MediumIP Addressing and Network Configuration

A network technician is troubleshooting a newly deployed workstation that can communicate with local host servers on the same segment but cannot reach external internet addresses. Operating system command output for the host display the following network settings:

IPv4 Address: 10.0.10.4510.0.10.45
Subnet Mask: 255.255.255.0255.255.255.0
Default Gateway: 10.0.20.110.0.20.1
DNS Server: 10.0.10.110.0.10.1

Which of the following statements correctly identify the cause of the connectivity failure and the appropriate resolution? (Select TWO.)

  1. The default gateway is configured on a different IP subnet than the client workstation host.Answer
  2. Updating the host's default gateway address to 10.0.10.1 will allow traffic to route off the local network.Answer
  3. C
    The workstation failed to contact a DHCP server and automatically assigned itself an APIPA address.
  4. D
    The DNS server address must be reconfigured to dynamic leasing mode to resolve IP addresses.

Answer

The host is unable to reach off-subnet resources because its configured default gateway (10.0.20.1) belongs to a different IP subnet than its host address (10.0.10.45/24). Reconfiguring the default gateway to a local subnet address (10.0.10.1) resolves the routing issue.
The subnet mask 255.255.255.0 (/24) requires all hosts and gateways on the local network segment to share the first three octets (10.0.10.x). Because the default gateway is set to 10.0.20.1, the host attempts to reach a gateway on another subnet directly without a local Layer 3 boundary router, causing off-subnet packet transmission to fail. Updating the gateway to an address within 10.0.10.x (such as 10.0.10.1) restores proper routing capabilities.

Step-by-Step Solution

1
Analyze host IP address and subnet mask.
Host IP 10.0.10.4510.0.10.45 with mask 255.255.255.0255.255.255.0 indicates local network subnet boundaries are 10.0.10.110.0.10.1 through 10.0.10.25410.0.10.254.
Determines the valid range of IP addresses for local network devices and gateways.
2
Compare default gateway address to subnet boundaries.
Default gateway 10.0.20.110.0.20.1 falls outside the host's 10.0.10.0/2410.0.10.0/24 subnet.
A host cannot send packets to a gateway that does not reside on the same local Layer 3 broadcast domain.
3
Select correct remediation steps.
Identify the misconfiguration as a subnet mismatch for the default gateway and update the gateway setting to 10.0.10.110.0.10.1.
Restores local router reachability for outbound external traffic.

Key Concept

Subnet Boundaries and Default Gateway Alignment
Estimated Time:1m 30s
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Topics

IP Addressing and Network Configuration

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