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Zorluk: KolayDHCP Architecture and Relay Services

Client computers on a user VLAN are unable to receive dynamic IP addresses because the network's DHCP server resides on a different IP subnet across a Layer 3 boundary. Which feature must be configured on the client gateway interface to forward broadcast DHCP requests to the central DHCP server as unicast traffic?

  1. DHCP Relay AgentCevap
  2. B
    TCP Port Forwarder on port 67
  3. C
    DNS Forwarding Service
  4. D
    Spanning Tree Protocol PortFast

Cevap

DHCP Relay Agent
The correct answer identifies the DHCP Relay Agent. Because routers do not forward Layer 2 broadcast messages, a DHCP relay agent configured on the default gateway interface intercepts the local DHCP broadcast requests (UDP port 67) and forwards them as unicast packets to the central DHCP server.

Adım Adım Çözüm

1
Identify the boundary restriction for DHCP broadcast messages.
Routers block Layer 2 broadcast packets (255.255.255.255) by default, preventing DHCP Discover messages from reaching remote subnets.
DHCP clients initially communicate using broadcast traffic on their local subnet.
2
Determine the required router mechanism to bridge DHCP requests across subnets.
Configuring a DHCP relay agent (e.g., `ip helper-address`) transforms client broadcast requests into unicast IP packets directed to the DHCP server address.
Unicast packets can be routed across Layer 3 networks to reach a central DHCP server.

Anahtar Kavram

DHCP Relay Agent functionality across Layer 3 boundaries
Tahmini Süre:45s
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Konular

DHCP Architecture and Relay Services

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