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Zorluk: ZorNetwork Host Services and Server Roles

Following a scheduled core router replacement at a corporate branch office, several workstations report intermittent domain authentication failures and encrypted web connection warnings. A technician discovers that the local system clocks on the affected workstations differ from the central domain controller by more than ten minutes. The workstations obtain their network configuration parameters automatically. Which network host service must be properly configured and reachable over UDP port 123 to resolve the time synchronization issue?

  1. Network Time Protocol (NTP) serverCevap
  2. B
    Domain Name System (DNS) server configured with dynamic IP lease timestamps
  3. C
    Dynamic Host Configuration Protocol (DHCP) server operating over TCP port 443
  4. D
    Automatic Private IP Addressing (APIPA) service issuing local timing broadcasts

Cevap

The Network Time Protocol (NTP) server role operating over UDP port 123 is required to synchronize system clocks across client workstations and domain controllers.
The Network Time Protocol (NTP) server role maintains precise clock synchronization across network clients and servers using UDP port 123. Authentication mechanisms like Kerberos require client clocks to be synchronized within a tight tolerance (typically 5 minutes) of the domain controller to prevent replay attacks. When time drifts beyond this threshold, authentication fails and TLS/SSL certificate validation errors occur.

Adım Adım Çözüm

1
Analyze the symptoms described in the scenario.
Identified domain authentication failures and SSL certificate errors resulting from client system clocks drifting by more than ten minutes.
Security protocols such as Kerberos and TLS rely on accurate timestamping to prevent replay attacks and validate certificate validity periods.
2
Identify the specific network host service responsible for time synchronization.
Determined that Network Time Protocol (NTP) is the standard host service for distributing system time across network clients.
NTP ensures all host devices maintain synchronized system clocks relative to a centralized authoritative time reference.
3
Verify the standard transport port requirement for the identified host service.
Confirmed that NTP operates on UDP port 123.
Firewall rules or router access control lists (ACLs) blocking UDP port 123 prevent clients from reaching the NTP server.

Anahtar Kavram

Network Time Protocol (NTP) Server Role
Tahmini Süre:1m 30s
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Network Host Services and Server Roles

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