A technician installs a new router at a small office. After the installation, the technician notices that all devices have a 169.254.X.X IP address. Printers and fileshares are still working, but PCs cannot access the Internet. Which of the following should the technician configure on the router to enable devices to connect to the internet?

Rationale

DHCP should be configured on the router to enable devices to connect to the internet.

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on a network, allowing them to communicate and connect to external networks like the Internet. The presence of 169.254.X.X IP addresses indicates that devices are using Automatic Private IP Addressing (APIPA) due to the lack of a DHCP server, preventing Internet connectivity.

A (APIPA) YOUR ANSWER

APIPA (Automatic Private IP Addressing) is a feature that allows devices to assign themselves an IP address in the range of 169.254.0.1 to 169.254.255.254 when a DHCP server is not available. While APIPA enables local network communication, it does not facilitate Internet access, which is the main issue the technician is facing.

B (DNS) YOUR ANSWER

DNS (Domain Name System) translates domain names into IP addresses, which is essential for accessing websites by name rather than by numeric IP. However, without a valid IP address assigned by DHCP, devices cannot even reach the DNS servers to resolve domain names, making DNS configuration irrelevant for the current problem.

C (DHCP) CORRECT

Configuring DHCP on the router will allow it to automatically assign valid IP addresses to devices in the network. This will replace the APIPA addresses with proper IP addresses that can communicate with the Internet, thus resolving the connectivity issue experienced by the PCs.

D (SMB) YOUR ANSWER

SMB (Server Message Block) is a network protocol used for sharing files and printers over a network. While it may facilitate local networking functions, it does not address the fundamental issue of IP address assignment or Internet connectivity, making it an unsuitable choice for this scenario.

Conclusion

To restore Internet access for PCs in the office, the technician must configure DHCP on the router. This will replace the self-assigned APIPA addresses with valid IP addresses, enabling all devices to communicate effectively with the Internet. Other options, such as APIPA, DNS, and SMB, do not resolve the underlying issue related to IP address assignment and Internet access.

DHCP should be configured on the router to enable devices to connect to the internet.

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