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SK0-005 · Question #395

A systems administrator is setting up a second VLAN for end users. Which of the following should be provisioned for a DHCP server to be able to receive client requests from a different subnet?

The correct answer is D. Relay agent. To enable DHCP clients on a new VLAN (different subnet) to receive IP addresses from a DHCP server located on another subnet, a DHCP relay agent must be provisioned.

Server administration

Question

A systems administrator is setting up a second VLAN for end users. Which of the following should be provisioned for a DHCP server to be able to receive client requests from a different subnet?

Options

  • ADHCP options
  • BNIC teaming
  • CZone transfers
  • DRelay agent
  • EVLAN ID

How the community answered

(44 responses)
  • A
    2% (1)
  • B
    2% (1)
  • C
    11% (5)
  • D
    77% (34)
  • E
    7% (3)

Why each option

To enable DHCP clients on a new VLAN (different subnet) to receive IP addresses from a DHCP server located on another subnet, a DHCP relay agent must be provisioned.

ADHCP options

DHCP options are configurations within the DHCP scope (like DNS servers or default gateways) but do not facilitate the communication between clients and a DHCP server across different subnets.

BNIC teaming

NIC teaming (or LACP) aggregates multiple network interface cards for redundancy or increased throughput on a single server and is unrelated to inter-VLAN DHCP communication.

CZone transfers

Zone transfers are a DNS mechanism for replicating DNS database information between DNS servers and have no bearing on DHCP client-server communication across subnets.

DRelay agentCorrect

DHCP requests are broadcast messages and are typically confined to the local subnet. When a DHCP server is on a different subnet than the clients, a DHCP relay agent (often configured on a router or Layer 3 switch) is necessary to forward these broadcast requests to the DHCP server and relay the responses back to the clients.

EVLAN ID

A VLAN ID is assigned to a VLAN to logically segment a network, but it alone does not enable DHCP requests to cross router boundaries to a server on a different subnet.

Concept tested: DHCP relay agent / inter-VLAN DHCP

Source: https://learn.microsoft.com/en-us/windows-server/networking/technologies/dhcp/dhcp-relay-agent

Topics

#DHCP#Networking#Relay Agent#VLANs

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