ICND1 Infrastructure Services 5 — Questions and Answers
Question 1: What is the maximum NTP stratum value that still indicates a valid, synchronized device?
- 10
- 15 (Correct answer)
- 16
- 255
Correct answer: 15
NTP stratum values of 1-15 indicate synchronized devices; stratum 16 means the device is unsynchronized.
Question 2: An administrator wants to make a Cisco router an authoritative NTP source at stratum 5. Which command accomplishes this?
- ntp server stratum 5
- ntp master 5 (Correct answer)
- ntp authenticate 5
- ntp clock-period 5
Correct answer: ntp master 5
'ntp master 5' configures the router as an authoritative NTP master at stratum level 5.
Question 3: Which Syslog level should be configured on a production router to capture only critical events without overwhelming the logging system?
- Level 7 (Debug)
- Level 6 (Informational)
- Level 3 (Errors) (Correct answer)
- Level 0 (Emergencies)
Correct answer: Level 3 (Errors)
Level 3 (Errors) captures Emergencies, Alerts, Critical, and Error messages while filtering out less critical informational and debug messages.
Question 4: What does the 'logging buffered' command do on a Cisco IOS device?
- Sends logs to a remote syslog server
- Stores log messages in the router's RAM buffer (Correct answer)
- Enables logging to the console
- Configures the log rotation interval
Correct 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'.
Question 5: Which SNMP operation allows the NMS to modify a value on a managed device?
- Get
- GetNext
- Set (Correct answer)
- Trap
Correct answer: Set
The SNMP Set operation allows the Network Management System to write or modify a variable value on a managed device.
Question 6: 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?
- It is immediately revoked
- It remains valid until it expires or is released (Correct answer)
- It is automatically moved to the next available address
- The DHCP pool shuts down
Correct 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.
Question 7: Which command displays the current NTP synchronization status and stratum of a Cisco router?
- show clock detail
- show ntp status (Correct answer)
- show ntp associations
- debug ntp all
Correct answer: show ntp status
'show ntp status' displays the current NTP synchronization state, stratum level, reference server, and clock offset.
ICND1 Infrastructure Services 5
What is the maximum NTP stratum value that still indicates a valid, synchronized device?