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Zorluk: KolayNTP Client and Server Operations and Configuration

An administrator is verifying Network Time Protocol (NTP) operations on a Cisco IOS router. Which of the following statements regarding NTP functionality and status are correct? (Select TWO.)

  1. The command `ntp master 4` configures the router to act as an NTP server serving time at stratum 4.Cevap
  2. A stratum value of 16 indicates that the local device clock is unsynchronized and considered invalid.Cevap
  3. C
    NTP uses TCP port 123 to guarantee reliable, connection-oriented packet delivery between peers.
  4. D
    Syslog severity level 7 represents emergency NTP loss-of-synchronization messages sent to remote servers.

Cevap

The command `ntp master 4` configures the router as an NTP server at stratum 4, and a stratum level of 16 indicates an unsynchronized clock state.
Configuring `ntp master 4` causes the router to act as an authoritative NTP clock source at stratum 4. Furthermore, stratum 16 is the standard NTP representation for an unsynchronized device or an unreachable clock source.

Adım Adım Çözüm

1
Analyze NTP stratum range and master configuration commands.
The `ntp master [number]` command allows an IOS router to advertise itself as an NTP master at the specified stratum. Valid synchronized strata are 1 through 15.
Stratum 1 is directly attached to a reference clock (like GPS/atomic), and each hop increments the stratum by 1. Stratum 16 defines an unsynchronized state.
2
Evaluate transport layer protocols used by NTP.
NTP uses UDP port 123.
UDP is chosen over TCP to minimize latency and synchronization overhead.

Anahtar Kavram

NTP Stratum Hierarchy and Master Configuration
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NTP Client and Server Operations and Configuration

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