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300-410 Practice Question: Router R5 has this DHCP configuration: ip dhcp…
Router R5 has this DHCP configuration: ip dhcp pool POOL3 network 172.16.0.0 255.255.255.0
default-router 172.16.0.1 option 150 ip 10.10.10.10 !
interface GigabitEthernet0/0 ip address 172.16.0.1 255.255.255.0 no shutdown
What is the purpose of the option 150 command?
⚠ Common exam trap
It's easy for candidates to confuse option 150 with option 66 (TFTP server name) or assume it is a generic custom option, but Cisco specifically tests that option 150 provides the TFTP server IP address for VoIP phones.
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
✓
It provides the IP address of a TFTP server to DHCP clients, typically used by VoIP phones.
Option 150 is a DHCP option that specifies the IP address of a TFTP server. Cisco IP phones use this option to locate the TFTP server from which they download their configuration and firmware files. The correct answer is A because this is the standard purpose of option 150 in a Cisco VoIP environment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It provides the IP address of a TFTP server to DHCP clients, typically used by VoIP phones.
Why this is correct
Option 150 is used to specify a TFTP server for VoIP phones or other devices that need to download configuration files.
- ✗
It sets the DNS server for the DHCP pool.
Why it's wrong here
DNS server is set with the dns-server command, not option 150.
- ✗
It defines a custom option that is ignored by standard DHCP clients.
Why it's wrong here
Option 150 is a well-known option for TFTP server; it is not ignored by devices that support it.
- ✗
It specifies the default gateway for the clients.
Why it's wrong here
The default gateway is set with the default-router command, not option 150.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 300-410 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 300-410 exam.