Dynamic Host Configuration Protocol (DHCP)

Correct Answer: Ensure the printer is set to obtain an IP address automatically

The best answer is 'Ensure the printer is set to obtain an IP address automatically'. Here's why: When a device such as a network printer is added to a network, it needs to receive an IP address from the DHCP server in order to communicate with other devices. If the printer is not receiving an IP address, it's likely that it's not set to obtain one automatically, which is usually the default setting. You should check this setting on the printer. The other answers might not solve the issue. Checking the printer's network cable or the network switch wouldn't necessarily solve the problem if the issue is with the printer's settings. Restarting the DHCP server could disrupt network services unnecessarily and wouldn't solve the problem if the printer is not set to obtain an IP address automatically.

Correct Answer: Configure the DHCP scope, activate the scope, and authorize the server

The best option to set up a new DHCP server for the sales department is to 'Configure the DHCP scope, activate the scope, and authorize the server'. The DHCP scope determines the range of IP addresses available for the server to assign to connected devices. After the scope is set, it needs to be activated to start assigning IP addresses. Lastly, the server needs to be authorized to become part of the network and start providing addresses. The other answers are not appropriate because they either include unnecessary steps like installing a DHCP relay agent, which is typically used to help transmit requests between different network segments, or they miss essential steps like activating the scope or authorizing the server.

Correct Answer: Extend the DHCP lease time

To have devices retain their assigned IP addresses for longer periods, the network administrator should extend the DHCP lease time. DHCP (Dynamic Host Configuration Protocol) assigns IP addresses to devices on a network. The 'lease time' is the amount of time that a device is allowed to keep that assigned IP address before it must request a new one. By extending the lease time, devices can keep their IP addresses for longer, reducing the need for frequent new IP address requests. Reducing the DHCP lease time would actually lead to more frequent IP address changes, not less. Configuring the devices with static IP addresses isn't a viable solution in this context because it would require manual intervention for adjusting each device’s IP address and it doesn't make use of DHCP. Disabling the DHCP server altogether would mean devices would not be able to automatically obtain an IP address, which is not the requirement here.