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Zorluk: OrtaSyslog Operations, Severity Levels, and Log Destination Configuration

A network administrator connects to a Cisco IOS router via SSH to troubleshoot a line protocol issue. After establishing the session, the administrator executes the command `terminal monitor`. Assuming the router is running default syslog configurations, which range of syslog severity levels will be displayed in this SSH terminal session?

  1. All syslog messages with severity levels 0 (Emergency) through 7 (Debugging)Cevap
  2. B
    Only syslog messages with numerical severity level 7 (Debugging), while lower numbers are suppressed
  3. C
    Only syslog messages with severity levels 0 (Emergency) through 4 (Warning)
  4. D
    No syslog messages will appear until a remote syslog server is defined using the `logging host` command

Cevap

All syslog messages with severity levels 0 (Emergency) through 7 (Debugging) will be displayed in the session.
In Cisco IOS, the default logging severity level for terminal monitor logging is level 7 (Debugging). Syslog thresholds operate inclusively for all severity levels equal to or lower than the configured numerical value. Because severity 0 (Emergency) is the most critical and severity 7 (Debugging) is the least critical, setting or inheriting the default level 7 monitor threshold allows messages of all severities (0 through 7) to be output to the active VTY session once `terminal monitor` is enabled.

Adım Adım Çözüm

1
Identify the function of the `terminal monitor` command.
The `terminal monitor` command enables the redirection of syslog messages to the active VTY (SSH/Telnet) session for the current user.
VTY sessions do not display syslog messages by default, unlike the physical console port.
2
Determine the default logging severity threshold for monitor logging in Cisco IOS.
The default severity level threshold for monitor logging is level 7 (Debugging).
Cisco IOS sets default logging thresholds for console, monitor, and buffered logging to debugging (level 7).
3
Evaluate how syslog threshold logic operates.
A logging threshold includes the specified severity level and all levels with lower numerical values (higher criticality).
Syslog severity ranges from 0 (Emergency) to 7 (Debugging). Therefore, a threshold of 7 includes all messages from 0 up to 7.

Anahtar Kavram

Cisco IOS Monitor Logging Default Severity Thresholds
Tahmini Süre:1m 30s
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