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EC-Council

312-50V10 · Question #46

A technician is resolving an issue where a computer is unable to connect to the Internet using a wireless access point. The computer is able to transfer files locally to other machines, but cannot suc

The correct answer is B. The gateway is not routing to a public IP address.. The computer and gateway share the same 192.168.1.0/24 subnet, so local communication works, but the gateway itself is not forwarding traffic outbound to public IP addresses on the Internet.

Information Security and Ethical Hacking Fundamentals

Question

A technician is resolving an issue where a computer is unable to connect to the Internet using a wireless access point. The computer is able to transfer files locally to other machines, but cannot successfully reach the Internet. When the technician examines the IP address and default gateway they are both on the 192.168.1.0/24. Which of the following has occurred?

Options

  • AThe computer is not using a private IP address.
  • BThe gateway is not routing to a public IP address.
  • CThe gateway and the computer are not on the same network.
  • DThe computer is using an invalid IP address.

How the community answered

(20 responses)
  • A
    5% (1)
  • B
    75% (15)
  • C
    5% (1)
  • D
    15% (3)

Why each option

The computer and gateway share the same 192.168.1.0/24 subnet, so local communication works, but the gateway itself is not forwarding traffic outbound to public IP addresses on the Internet.

AThe computer is not using a private IP address.

192.168.1.0/24 is a private IP range (RFC 1918), so the computer is correctly using a private address as expected for a LAN device.

BThe gateway is not routing to a public IP address.Correct

The default gateway is reachable and on the correct local subnet, so LAN file transfers succeed. However, the gateway is failing to route packets destined for public IP addresses - this points to a misconfiguration on the gateway's WAN interface or upstream routing, not a local addressing problem.

CThe gateway and the computer are not on the same network.

Both the computer and the gateway are confirmed to be on the same 192.168.1.0/24 network, which is why local transfers work; they are on the same network.

DThe computer is using an invalid IP address.

An address on 192.168.1.0/24 is a valid private IP address; the address itself is not invalid.

Concept tested: Default gateway routing to public internet

Source: https://www.rfc-editor.org/rfc/rfc1918

Topics

#default gateway#IP addressing#network routing#wireless connectivity

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