The correct answer is that LDP allocates labels for all prefixes in the IGP routing table by default. This occurs because LDP’s default behavior is to perform label allocation for every prefix learned via the Interior Gateway Protocol, such as OSPF or IS-IS, without requiring any additional configuration. The underlying mechanism uses the LDP transport address—typically the loopback interface—to establish sessions and distribute label bindings for these IGP routes. On the Cisco SPCOR 350-501 exam, this concept tests your understanding of MPLS autoconfiguration and the distinction between default label allocation and targeted LDP sessions. A common trap is assuming LDP only allocates labels for BGP routes or that it requires manual prefix lists; in reality, the default allocation covers all IGP prefixes. Remember the memory tip: “LDP loves all IGP—no filter, no fuss.”
350-501 Networking Practice Question
This 350-501 practice question tests your understanding of networking. 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.
Which TWO statements accurately describe MPLS LDP label distribution and autoconfiguration? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
LDP can be configured to allocate labels only for specific prefixes using label filtering.
LDP allocates labels for every IGP prefix by default. It uses the Transport address (usually loopback) to establish sessions. Option D is incorrect because LDP can also use targeted discovery.
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.
✓
LDP can be configured to allocate labels only for specific prefixes using label filtering.
Why this is correct
You can filter which prefixes get labels via ACL or prefix-list.
Related concept
Read the scenario before looking for a memorised answer.
✗
LDP uses hello messages sent to multicast address 224.0.0.2.
Why it's wrong here
LDP hello is sent to 224.0.0.2 for all routers, but that's for discovery; session uses unicast.
✓
LDP allocates labels for all prefixes in the IGP routing table by default.
Why this is correct
LDP automatically assigns labels to IGP routes.
Related concept
Read the scenario before looking for a memorised answer.
✗
LDP sessions are always established using the physical interface IP address.
Why it's wrong here
LDP uses the transport address, typically the loopback.
✗
LDP label allocation is per interface by default.
Why it's wrong here
Label allocation is per FEC (prefix), not per interface.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the 350-501 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Networking — This question tests Networking — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: LDP can be configured to allocate labels only for specific prefixes using label filtering. — LDP allocates labels for every IGP prefix by default. It uses the Transport address (usually loopback) to establish sessions. Option D is incorrect because LDP can also use targeted discovery.
What should I do if I get this 350-501 question wrong?
Identify which 350-501 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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