Infrastructure Services Flashcards

What is the maximum NTP stratum value that still indicates a valid, synchronized device?

Answer: 15

NTP stratum values of 1-15 indicate synchronized devices; stratum 16 means the device is unsynchronized.

An administrator wants to make a Cisco router an authoritative NTP source at stratum 5. Which command accomplishes this?

Answer: ntp master 5

'ntp master 5' configures the router as an authoritative NTP master at stratum level 5.

Which Syslog level should be configured on a production router to capture only critical events without overwhelming the logging system?

Answer: Level 3 (Errors)

Level 3 (Errors) captures Emergencies, Alerts, Critical, and Error messages while filtering out less critical informational and debug messages.

What does the 'logging buffered' command do on a Cisco IOS device?

Answer: Stores log messages in the router's RAM buffer

'logging buffered' stores syslog messages locally in the router's internal RAM buffer, viewable with 'show logging'.

Which SNMP operation allows the NMS to modify a value on a managed device?

Answer: Set

The SNMP Set operation allows the Network Management System to write or modify a variable value on a managed device.

A router is configured with 'ip dhcp pool SALES' and 'network 10.10.10.0 255.255.255.0'. A client on that subnet gets 10.10.10.15. The admin adds 'ip dhcp excluded-address 10.10.10.1 10.10.10.20' afterward. What happens to the existing lease for 10.10.10.15?

Answer: It remains valid until it expires or is released

Excluding an address range only prevents future assignments; existing leases remain valid until they expire or the client releases the address.

Which command displays the current NTP synchronization status and stratum of a Cisco router?

Answer: show ntp status

'show ntp status' displays the current NTP synchronization state, stratum level, reference server, and clock offset.