- A
The LISP Map Server stores the mapping between endpoint identifiers (EIDs) and routing locators (RLOCs).
Correct because the Map Server is the central database that holds EID-to-RLOC mappings for the fabric.
- B
LISP encapsulation is used to forward data traffic between fabric edge nodes.
Why wrong: Incorrect because LISP is only the control plane; data plane encapsulation is done by VXLAN, not LISP.
- C
The LISP Map Resolver processes Map-Request messages and responds with the RLOC of the destination EID.
Correct because the Map Resolver handles queries and returns the RLOC from the Map Server's database.
- D
LISP uses TCP port 4342 for control plane communication.
Why wrong: Incorrect because LISP uses UDP port 4342 for data plane (encapsulated traffic) and UDP 4341 for control plane.
- E
The EID in LISP represents the MAC address of the endpoint device.
Why wrong: Incorrect because the EID is the IP address of the endpoint, not the MAC address.
350-401 SD-Access Architecture Practice Question
This 350-401 practice question tests your understanding of sd-access architecture. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 about LISP in Cisco SD-Access are true? (Choose two.)
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 LISP Map Server stores the mapping between endpoint identifiers (EIDs) and routing locators (RLOCs).
LISP (Locator/ID Separation Protocol) is the control plane in SD-Access. The Map Server (MS) maintains the EID-to-RLOC mapping database, and the Map Resolver (MR) handles Map-Request queries. The EID represents the endpoint identity (IP address), while the RLOC is the routing locator (IP address of the fabric node). LISP does not perform encapsulation; VXLAN does. LISP uses UDP ports 4342 (data plane) and 4341 (control plane), not TCP. The EID is typically the host IP, not the MAC address.
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 LISP Map Server stores the mapping between endpoint identifiers (EIDs) and routing locators (RLOCs).
Why this is correct
Correct because the Map Server is the central database that holds EID-to-RLOC mappings for the fabric.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
LISP encapsulation is used to forward data traffic between fabric edge nodes.
Why it's wrong here
Incorrect because LISP is only the control plane; data plane encapsulation is done by VXLAN, not LISP.
- ✓
The LISP Map Resolver processes Map-Request messages and responds with the RLOC of the destination EID.
Why this is correct
Correct because the Map Resolver handles queries and returns the RLOC from the Map Server's database.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
LISP uses TCP port 4342 for control plane communication.
Why it's wrong here
Incorrect because LISP uses UDP port 4342 for data plane (encapsulated traffic) and UDP 4341 for control plane.
- ✗
The EID in LISP represents the MAC address of the endpoint device.
Why it's wrong here
Incorrect because the EID is the IP address of the endpoint, not the MAC address.
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?
SD-Access Architecture — This question tests SD-Access Architecture — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The LISP Map Server stores the mapping between endpoint identifiers (EIDs) and routing locators (RLOCs). — LISP (Locator/ID Separation Protocol) is the control plane in SD-Access. The Map Server (MS) maintains the EID-to-RLOC mapping database, and the Map Resolver (MR) handles Map-Request queries. The EID represents the endpoint identity (IP address), while the RLOC is the routing locator (IP address of the fabric node). LISP does not perform encapsulation; VXLAN does. LISP uses UDP ports 4342 (data plane) and 4341 (control plane), not TCP. The EID is typically the host IP, not the MAC address.
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.
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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