220-1102 Question 536
Single answerRouter settingsA small office recently replaced its ISP modem with a modem-only device and connected it to an existing wireless router. Since the change, users can connect to the office Wi-Fi, but no one can browse the internet. A technician confirms that the modem has internet connectivity when a laptop is connected directly to it. The router's wireless settings appear normal, and client devices are receiving private IP addresses from the router. Which router setting should the technician check first to restore internet access for all wireless users?
- A
The router's WAN/Internet connection type
- B
The router's SSID broadcast setting
- C
The router's MAC address filtering list
- D
The router's channel width setting
Show answer and explanation
Correct answer: A
Explanation
The best answer is to check the router's WAN/Internet connection type first. This is a common real-world issue after replacing ISP equipment or changing how a router connects to the provider. If the ISP expects DHCP but the router is set to PPPoE, or if PPPoE credentials are required and missing, the router's LAN clients will still connect locally and receive private addresses from the router's DHCP service, but internet access will fail for everyone. This aligns with standard router troubleshooting practice: verify physical link, confirm LAN operation, then validate WAN settings. Consumer and SMB router documentation from vendors such as TP-Link, Netgear, ASUS, and Linksys commonly instruct technicians to confirm the Internet/WAN type and any required credentials after ISP or modem changes.
- A. Correct.
Correct. When a router is connected to a modem or ISP handoff, the WAN/Internet interface must be configured with the proper connection type, such as DHCP, PPPoE, or static IP, based on the ISP's requirements. In this scenario, clients are successfully joining Wi-Fi and receiving private IP addresses, which means the LAN side of the router is functioning. The missing internet access for all users points to the router's upstream WAN configuration as the most likely issue.
- B. Incorrect.
Incorrect. SSID broadcast controls whether the wireless network name is visible to nearby devices. Since users are already connecting to the office Wi-Fi, SSID broadcast is not the cause of the internet outage. This option may tempt someone who associates Wi-Fi visibility with connectivity, but it does not affect the router's ability to reach the ISP.
- C. Incorrect.
Incorrect. MAC address filtering can allow or deny specific devices from joining the wireless network. However, the scenario states that users can connect to Wi-Fi and are receiving private IP addresses, indicating that access to the wireless network is already permitted. MAC filtering would be more relevant if only certain devices could not connect.
- D. Incorrect.
Incorrect. Channel width affects wireless performance and possible interference, not whether the router can route traffic to the internet through its WAN interface. A poor channel-width choice might reduce throughput or stability, but it would not typically prevent all connected clients from accessing the internet immediately after an ISP equipment change.