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N10-005 · Question #813

A technician is troubleshooting a network camera. The technician restarted the modem and now the camera is no longer available from a mobile device. Which of the following has MOST likely occurred?

The correct answer is A. The public IP address of the network has changed. When accessing a network camera remotely from a mobile device, the mobile app or user connects to the camera using the network's public IP address (the IP assigned to the modem/router by the ISP). Most residential and small business ISP connections use dynamic IP addressing…

Network troubleshooting

Question

A technician is troubleshooting a network camera. The technician restarted the modem and now the camera is no longer available from a mobile device. Which of the following has MOST likely occurred?

Options

  • AThe public IP address of the network has changed.
  • BThe camera has received a new firmware update.
  • CThe camera's secure shell has been disabled.
  • DThe router has changed the IP of the mobile device.

How the community answered

(17 responses)
  • A
    82% (14)
  • B
    6% (1)
  • C
    12% (2)

Explanation

When accessing a network camera remotely from a mobile device, the mobile app or user connects to the camera using the network's public IP address (the IP assigned to the modem/router by the ISP). Most residential and small business ISP connections use dynamic IP addressing - each time the modem reconnects, it may receive a different public IP from the ISP. Restarting the modem triggers a new DHCP lease from the ISP, which often results in a new public IP. The mobile device then tries to connect to the old (now incorrect) IP address and fails. A firmware update (B) is unrelated to a modem restart. SSH being disabled (C) would affect a specific access method, not general remote availability. The router changing the mobile device's IP (D) is irrelevant since the mobile device is on an external network.

Topics

#dynamic IP#NAT#port forwarding#remote camera access

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