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AZ-800 · Question #68

Your network contains an Active Directory Domain Services (AD DS) domain. The domain contains 10 servers that run Windows Server. The servers have static IP addresses. You plan to use DHCP to assign…

The correct answer is D. MAC address. DHCP reservations are created using a client's MAC address, which is the hardware-layer identifier included in every DHCP request that the server uses to match and assign a pre-configured IP.

Implement and manage an on-premises and hybrid networking infrastructure

Question

Your network contains an Active Directory Domain Services (AD DS) domain. The domain contains 10 servers that run Windows Server. The servers have static IP addresses. You plan to use DHCP to assign IP addresses to the servers. You need to ensure that each server always receives the same IP address. Which type of identifier should you use to create a DHCP reservation for each server?

Options

  • Auniversally unique identifier (UUID)
  • Bfully qualified domain name (FQDN)
  • CNetBIOS name
  • DMAC address

How the community answered

(27 responses)
  • A
    4% (1)
  • B
    4% (1)
  • C
    7% (2)
  • D
    85% (23)

Why each option

DHCP reservations are created using a client's MAC address, which is the hardware-layer identifier included in every DHCP request that the server uses to match and assign a pre-configured IP.

Auniversally unique identifier (UUID)

UUIDs can identify clients in PXE boot scenarios via the Client Identifier option, but MAC address is the standard supported identifier for creating DHCP reservations in Windows Server DHCP.

Bfully qualified domain name (FQDN)

FQDNs are DNS-layer identifiers resolved after an IP address is already assigned; the DHCP server has no mechanism to look up or match clients by FQDN during the IP assignment process.

CNetBIOS name

NetBIOS names are a legacy name resolution mechanism operating above the network layer and are not transmitted in DHCP messages, so they cannot be used to identify clients for reservations.

DMAC addressCorrect

The MAC address is embedded in the network interface card and is transmitted in the DHCP Discover and Request messages (chaddr field), allowing the DHCP server to uniquely identify the client and assign its reserved IP address every time it requests a lease, regardless of hostname or other configuration.

Concept tested: DHCP reservation identification using MAC address

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

Topics

#DHCP#DHCP Reservation#MAC Address#Network Configuration

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