LPIC-1 Essential System Services and Networking Practice Question
Exhibit
Refer to the exhibit. $ cat /var/log/messages | grep -i "dhcp" | tail -5 Nov 12 08:22:15 server dhcpd: DHCPDISCOVER from 00:1a:2b:3c:4d:5e via eth0 Nov 12 08:22:15 server dhcpd: DHCPOFFER on 192.168.1.100 to 00:1a:2b:3c:4d:5e via eth0 Nov 12 08:22:18 server dhcpd: DHCPREQUEST for 192.168.1.100 (192.168.1.1) from 00:1a:2b:3c:4d:5e via eth0 Nov 12 08:22:18 server dhcpd: DHCPACK on 192.168.1.100 to 00:1a:2b:3c:4d:5e via eth0 Nov 12 08:22:20 server dhcpd: DHCPINFORM from 192.168.1.100 via eth0
An administrator reviews the above DHCP server logs. Based on the output, which statement is correct about the DHCP transaction?
⚠ Common exam trap
It's easy for candidates to confuse the DHCPREQUEST broadcast requirement with a rejection, or incorrectly assume that a DHCPINFORM is used for lease renewal, when in fact DHCPINFORM is only for stateless configuration requests.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The client successfully obtained the IP address 192.168.1.100.
The DHCP server logs show a successful four-way handshake: DHCPDISCOVER, DHCPOFFER, DHCPREQUEST, and DHCPACK. The final DHCPACK from the server confirms that the client has been granted the IP address 192.168.1.100, making option C correct.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The client sent a DHCPINFORM to renew its existing lease.
Why it's wrong here
DHCPINFORM is used to request additional config, not for renewal.
- ✗
The DHCP server is configured to assign IP addresses from a pool that includes 192.168.1.100.
Why it's wrong here
The log does not reveal the pool configuration; it only shows that 192.168.1.100 was offered and acknowledged.
- ✓
The client successfully obtained the IP address 192.168.1.100.
Why this is correct
DHCPACK confirms the lease assignment.
- ✗
The DHCP server rejected the client's request because the DHCPREQUEST was not broadcast.
Why it's wrong here
The DHCPREQUEST was unicast to the server (192.168.1.1), which is valid after an OFFER.
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Written by Johnson Ajibi, MSc IT Security
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