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Zorluk: ZorNetwork Hardware Devices

A network administrator configures a new VLAN for an expanded department on an enterprise network. Workstations connected to switches on this new VLAN fail to obtain IP configuration settings and automatically assign themselves IP addresses in the range of 169.254.1.1 to 169.254.254.254. The organization maintains a single, centralized DHCP server located on a separate administrative subnet across a default gateway router. Which network hardware device configuration will allow workstations on the new VLAN to successfully request and receive IP addresses from the existing centralized DHCP server?

  1. Configure a DHCP relay agent on the local router interface to forward broadcast DHCP requests to the central DHCP server as unicast traffic.Cevap
  2. B
    Install a dedicated DNS server on the new VLAN segment to lease IP address configurations directly to local client computers.
  3. C
    Replace the router interface with an unmanaged Layer 2 switch to bridge all broadcast domains into a single flat network without subnets.
  4. D
    Enable APIPA routing protocols on client network adapters so 169.254.x.x addresses can traverse the router to communicate globally.

Cevap

Configure a DHCP relay agent on the local router interface to forward broadcast DHCP requests to the central DHCP server as unicast traffic.
DHCP client discovery uses broadcast packets that are dropped by network routers. Configuring a DHCP relay agent (or IP helper address) on the default gateway router allows the router to intercept client broadcasts on the local VLAN and relay them as unicast packets directly to the central DHCP server across subnets.

Adım Adım Çözüm

1
Analyze the observed network symptoms
Workstations are receiving 169.254.x.x addresses, indicating APIPA self-assignment due to failure in reaching a DHCP server.
When client devices fail to get a DHCP response, the OS assigns an APIPA link-local address.
2
Identify the network boundary constraint
The central DHCP server is on a different subnet, and default gateway routers block Layer 2/3 broadcast messages.
DHCP Client Discover packets are broadcast-based and do not cross router boundaries automatically.
3
Determine the required hardware device feature
Enable a DHCP Relay Agent (IP Helper) on the router interface serving the client VLAN.
The relay agent converts client broadcast requests into unicast packets addressed directly to the central DHCP server.

Anahtar Kavram

DHCP Relay / IP Helper on Routers
Tahmini Süre:1m 30s
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Konular

Network Hardware Devices

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