The correct answer is PATCH, targeting the specific IPv4 address list under the interface URI. PATCH is the right HTTP method because it performs a partial update to an existing resource, allowing you to add a new IPv4 address without overwriting the entire interface configuration. In contrast, PUT would replace the whole resource, which is risky when only adding an address. On the Cisco SPCOR 350-501 exam, this tests your understanding of RESTCONF’s resource hierarchy and RFC 8040’s partial modification rules. A common trap is choosing PUT because it seems like an “update,” but PATCH is required for granular changes like appending an address to a list. Remember the tip: “PATCH for a patch of the config, PUT for the whole put-together.”
350-501 Automation and Assurance Practice Question
This 350-501 practice question tests your understanding of automation and assurance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A service provider uses RESTCONF to automate interface configuration. They need to add a new IPv4 address to an existing interface. Which HTTP method and URI should be used?
Option B is correct because PATCH is the appropriate HTTP method for a partial update to an existing resource, and the URI targets the IPv4 address list under the specific interface. This allows adding a new IPv4 address without replacing the entire interface configuration, which aligns with RESTCONF's support for partial resource modification as defined in RFC 8040.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Read the scenario before looking for a memorised answer.
✗
POST /restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet0/1/ietf-ip:ipv4
Why it's wrong here
POST is used to create a new resource, not to add to an existing list.
✗
PUT /restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet0/1/ietf-ip:ipv4/address
Why it's wrong here
PUT replaces the entire address list, not add.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the difference between PATCH (partial update) and PUT (full replacement), where candidates mistakenly choose PUT thinking it 'updates' the resource, but it actually replaces the entire list.
Detailed technical explanation
How to think about this question
RESTCONF uses the YANG-defined data model (ietf-interfaces) where the 'address' node is a list under the 'ipv4' container. A PATCH with the 'application/yang-patch+json' media type (or plain PATCH) allows adding a new list entry without affecting other entries. In contrast, PUT would require the client to send the complete list, risking accidental deletion of existing addresses—a critical distinction in production automation where interfaces often have multiple IPs.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Automation and Assurance — This question tests Automation and Assurance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: PATCH /restconf/data/ietf-interfaces:interfaces/interface=GigabitEthernet0/1/ietf-ip:ipv4/address — Option B is correct because PATCH is the appropriate HTTP method for a partial update to an existing resource, and the URI targets the IPv4 address list under the specific interface. This allows adding a new IPv4 address without replacing the entire interface configuration, which aligns with RESTCONF's support for partial resource modification as defined in RFC 8040.
What should I do if I get this 350-501 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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