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Zorluk: KolayDHCP Architecture and Relay Services

Client workstations located on VLAN 10 are unable to automatically receive IP addressing information because the network's DHCP server resides on VLAN 20 across a Layer 3 device. Which service must be configured on the router interface servicing VLAN 10 to enable DHCP request delivery to the server?

  1. DHCP Relay Agent (IP helper address)Cevap
  2. B
    TCP port 67 port-forwarding rule
  3. C
    Client-side configuration to send requests over UDP port 68
  4. D
    VLAN trunking allowing client broadcast domains to span both subnets without routing

Cevap

Configuring a DHCP Relay Agent (IP helper address) on the gateway router interface enables local broadcast DHCP requests to be forwarded as unicast packets to a DHCP server located on a separate subnet.
Configuring a DHCP Relay Agent (or IP helper address) on the local router interface allows the router to accept broadcast DHCP DISCOVER/REQUEST packets on the client subnet, encapsulate them into unicast packets, and forward them directly to the remote DHCP server's IP address across Layer 3 boundaries.

Adım Adım Çözüm

1
Identify the cause of the DHCP request failure across subnets.
Recognize that Layer 2 DHCP broadcast packets (DISCOVER) cannot cross Layer 3 router boundaries by default.
Routers drop broadcast packets to maintain broadcast domain isolation between subnets.
2
Select the appropriate network service to bridge DHCP traffic between subnets.
Determine that a DHCP Relay Agent (configured via IP helper address) must be placed on the client's default gateway interface.
The relay agent listens for client broadcasts on UDP port 67 and encapsulates them into unicast UDP packets destined for the remote DHCP server's IP address.

Anahtar Kavram

DHCP Relay Agent and IP Helper Functionality
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Konular

DHCP Architecture and Relay Services

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