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Difficulty: HardIP Addressing Services

A network engineer is configuring core IP addressing and discovery services for a newly integrated corporate site containing multiple VLANs. The site relies on a central DHCP cluster located in the main data center and uses specialized service location for VoIP unified communications. Which TWO of the following network service configurations must be implemented on the local network infrastructure to support these requirements?

  1. Configure an IP helper address on each remote VLAN router interface pointing to the centralized DHCP server IP.Answer
  2. Create DNS SRV (Service) records specifying the hostname, port, and priority for unified communications servers.Answer
  3. C
    Configure DNS A records to resolve hostnames to internal IPv6 addresses across multi-subnet environments.
  4. D
    Install and enable the DHCP relay service directly on the centralized DHCP server interface rather than on remote gateways.
  5. E
    Configure Network Time Protocol (NTP) to synchronize infrastructure clock times using UDP port 69.

Answer

The correct configurations are configuring an IP helper address on each remote VLAN router interface pointing to the centralized DHCP server IP, and creating DNS SRV records specifying the hostname, port, and priority for unified communications servers.
The correct configurations involve implementing an IP helper address on each client VLAN default gateway to forward DHCP broadcasts across Layer 3 boundaries to the central server, and defining DNS SRV records to provide hostnames and port numbers for dynamic service location.

Step-by-Step Solution

1
Analyze the DHCP relay requirement across routed subnets
Identified that client DHCP broadcast messages are dropped by Layer 3 boundaries.
An IP helper address (DHCP relay agent) must be configured on remote gateway interfaces to encapsulate DHCP broadcasts into unicast UDP packets destined for the central DHCP server.
2
Analyze service location requirements for network clients
Identified DNS SRV records as the standardized protocol location mechanism.
DNS SRV records publish both hostname and port information, enabling clients to locate specialized infrastructure services like VoIP or Active Directory controllers.
3
Evaluate and eliminate distractors based on protocol standards
Rejected A records for IPv6 (requires AAAA), incorrect DHCP relay placement, and incorrect NTP port assignment (NTP uses UDP 123, not 69).
Ensures complete technical accuracy across IPv6 DNS, DHCP architecture, and standard port mappings.

Key Concept

IP Addressing Services and Helper Configurations
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Topics

IP Addressing Services

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