CompTIA Network+ Practice Test

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Prepare for the CompTIA Network+ Exam. Utilize flashcards and multiple choice questions with detailed hints and explanations. Equip yourself for success!

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What is the role of a DHCP relay or helper?

To increase network speed
To allow DHCP requests across broadcast domains
To manage IP address allocation
To replace the primary DHCP server

The correct answer is: To allow DHCP requests across broadcast domains

The function of a DHCP relay, also known as a DHCP helper, is to facilitate the transmission of DHCP requests and responses between clients and a DHCP server that may not be located on the same local network or broadcast domain. In typical scenarios, DHCP operates through broadcast messages sent on the local network. However, routers and other network devices do not forward broadcast messages beyond their subnet. When a DHCP relay is configured, it listens for DHCP broadcast messages from clients on one subnet and forwards these messages to a DHCP server on another subnet. This relay mechanism allows clients in different broadcast domains to obtain IP addresses and network configuration from a central DHCP server, which is essential for efficient network management in larger or segmented networks. The other roles mentioned, such as increasing network speed, managing IP address allocation, or replacing the primary DHCP server, do not accurately describe the primary function of a DHCP relay. While DHCP relays support overall network efficiency by allowing centralized management of IP addressing, their specific role revolves around bridging communication across different network segments rather than directly managing or replacing servers.