Cisco CCNA Cisco CCNA IP Services 1 — Questions and Answers
Question 1: Which protocol does a DHCP client use to initially discover a DHCP server on the network?
- DHCP Discover (broadcast) (Correct answer)
- DHCP Request (unicast)
- DHCP Offer (unicast)
- DHCP Inform (multicast)
Correct answer: DHCP Discover (broadcast)
A DHCP client sends a DHCP Discover message as a broadcast to find available DHCP servers on the local network.
Question 2: What is the default lease time for a DHCP address assignment on a Cisco IOS router if not explicitly configured?
- 1 day (Correct answer)
- 8 hours
- 12 hours
- 7 days
Correct answer: 1 day
Cisco IOS DHCP server defaults to a 1-day (24-hour) lease time when no explicit lease duration is configured.
Question 3: Which NTP stratum number indicates that a device is directly connected to a reference clock (e.g., GPS)?
- Stratum 1 (Correct answer)
- Stratum 0
- Stratum 2
- Stratum 15
Correct answer: Stratum 1
Stratum 1 NTP servers are directly connected to a stratum 0 reference clock source such as GPS or atomic clocks.
Question 4: What is the well-known UDP port number used by SNMP agents to receive requests from an SNMP manager?
- 161 (Correct answer)
- 162
- 514
- 123
Correct answer: 161
SNMP agents listen on UDP port 161 for polling requests sent by the SNMP manager.
Question 5: Which Syslog severity level number represents a 'Critical' condition on a Cisco device?
- 2 (Correct answer)
- 0
- 4
- 6
Correct answer: 2
Syslog severity level 2 is Critical, indicating serious conditions that require immediate attention.
Question 6: Which DNS record type maps a fully qualified domain name (FQDN) to an IPv4 address?
- A record (Correct answer)
- AAAA record
- CNAME record
- PTR record
Correct answer: A record
An A (Address) record maps a hostname to a 32-bit IPv4 address in the DNS namespace.
Cisco CCNA Cisco CCNA IP Services 1
Which protocol does a DHCP client use to initially discover a DHCP server on the network?