- A
The IP SLA HTTP operation must be configured with a 'url' that includes the full path, otherwise it defaults to the root and returns 404.
Why wrong: Incorrect because the 404 is returned, but the operation still succeeds; the issue is that the operation does not treat 404 as a failure.
- B
The IP SLA HTTP operation does not interpret HTTP status codes by default; it only checks if a TCP connection is established.
Correct. IP SLA HTTP probe by default only verifies that the TCP handshake succeeds and a response is received. It does not parse the HTTP status code unless a 'status-code' match is configured.
- C
The track object must be configured with a 'down' threshold to trigger when the HTTP response time exceeds a value.
Why wrong: Incorrect because the track object is already up; the issue is that the operation does not consider the 404 as a failure, not that the response time is too high.
- D
The HTTP server is responding, so the IP SLA operation correctly shows success; the engineer must use a different type of probe, like TCP connect, to detect the 404.
Why wrong: Incorrect because the HTTP probe can be configured to match specific status codes; it is not necessary to use a different probe type.
Quick Answer
The answer is that by default, an IP SLA HTTP operation only verifies TCP connectivity, not the actual HTTP status code. This is the root cause of the issue because the IP SLA establishes a successful TCP handshake with the server at 10.1.1.1, which satisfies the operation’s default success criteria, regardless of the HTTP 404 response. On the ENCOR 350-401 exam, this scenario tests your understanding that IP SLA HTTP operations treat any HTTP response as a success unless you explicitly configure a status code match using the `expect` option. A common trap is assuming a 404 error will cause the operation to fail, but the track object remains “up” because the TCP connection itself is healthy. To remember this, think: “IP SLA HTTP checks the pipe, not the payload.”
350-401 IP SLA Practice Question
This 350-401 practice question tests your understanding of ip sla. 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 network engineer configures IP SLA 1 to monitor HTTP server availability at 10.1.1.1 using HTTP GET. The operation is used as a track object for a backup static route. The engineer notices that the IP SLA operation shows 'State: Active' and 'Latest RTT: 200 ms', but the track object shows 'Track 1: up' even though the HTTP server returns a 404 error. What is the cause?
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 IP SLA HTTP operation does not interpret HTTP status codes by default; it only checks if a TCP connection is established.
By default, IP SLA HTTP operations consider a successful HTTP response (any status code) as a success. The operation does not fail on 404 unless a specific status code match is configured.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 IP SLA HTTP operation must be configured with a 'url' that includes the full path, otherwise it defaults to the root and returns 404.
Why it's wrong here
Incorrect because the 404 is returned, but the operation still succeeds; the issue is that the operation does not treat 404 as a failure.
- ✓
The IP SLA HTTP operation does not interpret HTTP status codes by default; it only checks if a TCP connection is established.
- ✗
The track object must be configured with a 'down' threshold to trigger when the HTTP response time exceeds a value.
Why it's wrong here
Incorrect because the track object is already up; the issue is that the operation does not consider the 404 as a failure, not that the response time is too high.
- ✗
The HTTP server is responding, so the IP SLA operation correctly shows success; the engineer must use a different type of probe, like TCP connect, to detect the 404.
Why it's wrong here
Incorrect because the HTTP probe can be configured to match specific status codes; it is not necessary to use a different probe type.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP SLA — This question tests IP SLA — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The IP SLA HTTP operation does not interpret HTTP status codes by default; it only checks if a TCP connection is established. — By default, IP SLA HTTP operations consider a successful HTTP response (any status code) as a success. The operation does not fail on 404 unless a specific status code match is configured.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
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Same concept, more angles
2 more ways this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop the steps of IP SLA HTTP operation for application monitoring into the correct order, from first to last.
medium- ✓ A.Create IP SLA HTTP operation with URL
- ✓ B.Set HTTP method (GET/POST) and version
- ✓ C.Configure HTTP response code monitoring
- ✓ D.Schedule IP SLA operation
- ✓ E.Verify operation with show ip sla statistics
Why A: First, the HTTP operation is defined with the target URL. Then optional parameters like HTTP method or version are set. The operation is configured to monitor HTTP response. Next, the operation is scheduled. Finally, verification is done to confirm the operation is active.
Variation 2. Drag and drop the steps of IP SLA HTTP operation for application monitoring into the correct order, from first to last.
medium- ✓ A.Create IP SLA operation with type http
- ✓ B.Specify target URL and HTTP method
- ✓ C.Configure optional HTTP parameters
- ✓ D.Schedule the IP SLA operation
- ✓ E.Verify HTTP response and latency
Why A: Start by creating the IP SLA operation with HTTP type. Then specify the target URL and HTTP method (e.g., GET). Optionally configure HTTP version and other parameters. Next, schedule the operation to run. Finally, verify the HTTP response times and status.
Last reviewed: Jun 18, 2026
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