Question 19

Check DHCP First

The network administrator should first check the DHCP (Dynamic Host Configuration Protocol) settings, as this service is essential for assigning IP addresses to devices on the network. If the laptops are unable to access or ping network resources, it is likely that they are not receiving valid IP addresses from the DHCP server.

A) DHCP

This option is correct because DHCP is responsible for dynamically assigning IP addresses to devices on the network. If laptops are unable to access network resources, a failure in the DHCP service could mean that the laptops are not receiving the necessary IP configuration, resulting in connectivity issues.

B) AAA

AAA (Authentication, Authorization, and Accounting) is not directly related to the initial connectivity issues described in the question. While it is important for managing user access and permissions, it does not impact the basic ability of devices to communicate on the network, making this option incorrect in this context.

C) DNS

DNS (Domain Name System) translates domain names into IP addresses. Although DNS issues can prevent access to network resources, they typically do not affect the ability to ping devices if the devices are configured correctly. Therefore, checking DNS is not the first priority in troubleshooting connectivity problems.

D) ARP

ARP (Address Resolution Protocol) is used to map IP addresses to MAC addresses. While ARP issues can lead to problems in local network communication, they would not be the first thing to check if laptops are failing to obtain an IP address. Hence, this option is not the most relevant in this scenario.

Conclusion

In summary, checking DHCP first is crucial as it directly impacts whether laptops can obtain an IP address and subsequently access network resources. The other options, while important in different contexts, do not address the immediate issue of connectivity failure as effectively as DHCP does.