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Difficulty: MediumIP Addressing Services

A network engineering team is deploying core IP addressing and network management services for domain-joined hosts across multiple routed subnets. To ensure accurate logging correlation across distributed systems and proper name resolution for dual-stack hosts, which of the following protocols or resource records should be implemented? (Select TWO.)

  1. NTP operating on UDP port 123 to maintain consistent time synchronization across network hosts and security devices.Answer
  2. AAAA resource records configured in the DNS server to map internal hostnames to assigned IPv6 addresses.Answer
  3. C
    DHCP relay agents configured to listen on TCP port 67 on remote switch interfaces to forward client requests.
  4. D
    CNAME resource records configured to resolve client IP addresses back to canonical hostnames during reverse lookups.
  5. E
    A DHCP relay agent deployed directly on the centralized DHCP server interface to convert client broadcasts into unicast traffic.

Answer

The correct implementations are NTP operating on UDP port 123 for network-wide time synchronization and AAAA records in DNS for mapping hostnames to IPv6 addresses.
NTP operating on UDP port 123 provides centralized time synchronization required for log correlation across network systems. In addition, AAAA resource records in DNS provide standard hostname-to-IPv6 address resolution for dual-stack environments.

Step-by-Step Solution

1
Analyze time synchronization requirement
NTP operates on UDP port 123 to provide clock synchronization across log sources and network endpoints.
Accurate event correlation and log auditing across distributed subnets require synchronized clocks using NTP.
2
Analyze host name resolution requirement for dual-stack hosts
DNS AAAA records map hostnames directly to 128-bit IPv6 addresses.
Standard forward DNS resolution for IPv6 protocol addressing uses AAAA resource records.
3
Evaluate distractor options against protocol specifications and placement rules
DHCP uses UDP ports 67/68 (not TCP), PTR records perform reverse lookups (not CNAME), and relay agents belong on client default gateways (not the server interface).
Identifying accurate protocol ports, record types, and deployment locations eliminates incorrect service configurations.

Key Concept

IP Addressing Services (NTP operations, DNS record types, and DHCP relay architectural requirements)
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Topics

IP Addressing Services

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