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Dynamic Host Configuration Protocol (DHCP)

5 minutes 5 Questions

Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the assignment of IP addresses, subnet masks, default gateways, and other networking information to devices in an IP network. DHCP operates at the application layer of the OSI model and uses a client-server…

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CompTIA Network+ - Dynamic Host Configuration Protocol (DHCP) Example Questions

Test your knowledge of Dynamic Host Configuration Protocol (DHCP)

Question 1

A network technician is setting up a DHCP server to assign IP addresses to wireless clients. To ensure clients get the correct gateway, what option should be added in the DHCP server configuration?

Correct Answer: Option 3 (Router)

The DHCP server uses different options to provide clients with network configuration parameters. To ensure wireless clients get the correct gateway, Option 3, which corresponds to the Router option, should be added in the DHCP server configuration. This option tells the DHCP client which IP address to use as the default gateway. The other mentioned options in the answers like, Option 15 is for specifying the domain name, Option 6 is used for listing DNS servers, and Option 44 is for specifying NetBIOS WINS servers, none of these options are used for setting up the default gateway.

Question 2

Which DHCP message is sent by a client to test if its previously assigned IP address is still valid after the system reboots?

Correct Answer: DHCP Request

The correct answer is 'DHCP Request'.

When a system reboots and already has a previously assigned IP address, it doesn't need to go through the full DHCP process again. Instead, it sends a DHCP Request message directly to the DHCP server to verify if its existing IP address is still valid and can be used.

Here's why the other options are incorrect:

DHCP Discover is used when a client doesn't have an IP address and is seeking one for the first time or after its lease has expired. It's not used to verify an existing IP address.

DHCP Offer is sent by the DHCP server in response to a DHCP Discover message. It's not a message sent by the client.

DHCP Acknowledge is also sent by the DHCP server, not the client. It's used to confirm the IP address assignment to the client after receiving a DHCP Request.

The DHCP Request message is the correct choice because it allows the client to efficiently check the validity of its existing IP address configuration after a reboot, streamlining the process and reducing network traffic.

Question 3

A network administrator has discovered that clients in a remote department are receiving incorrect IP address assignments. A DHCP server is suspected to be the issue. What should be verified on the DHCP server to resolve this problem?

Correct Answer: Check the scope configuration

The DHCP (Dynamic Host Configuration Protocol) server is responsible for providing IP addresses to client systems in a network. If incorrect IP address assignments are being received, the scope configuration on the DHCP server should be verified. The scope configuration defines the range of IP addresses that the DHCP server can assign to clients. If the scope is incorrect, clients can receive wrong IP addresses. The other options are not best-fit solutions. Disabling DORA process would stop the DHCP Discovery, Offer, Request, Acknowledge cycle, which is essential for DHCP server operation. Disabling port 67 would stop the UDP communication required for DHCP server operation. Modifying DHCP snooping settings would not help in this scenario as snooping is used to prevent unauthorized DHCP servers rather than address issues with IP address assignments.

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