- A
Load balancing via MLAG
Why wrong: MLAG is a proprietary mechanism.
- B
ES-IS protocol
Why wrong: Not used for DF election.
- C
DF election via ESI label and route type 4
Route type 4 (Ethernet Segment route) is used to announce ESI and perform DF election.
- D
MSTP
Why wrong: MSTP is for spanning tree.
Question 748 of 1,000
350-501 MPLS and Segment Routing Practice Question
This 350-501 practice question tests your understanding of mpls and segment routing. 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.
In EVPN multi-homing with all-active mode, which mechanism is used to elect a designated forwarder (DF) for broadcast, unknown unicast, and multicast (BUM) traffic on a given Ethernet segment?
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
✓
DF election via ESI label and route type 4
The DF election is performed using a deterministic algorithm based on the ESI and the list of PEs, with the lowest IP address becoming DF.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Load balancing via MLAG
Why it's wrong here
MLAG is a proprietary mechanism.
- ✗
ES-IS protocol
Why it's wrong here
Not used for DF election.
- ✓
DF election via ESI label and route type 4
Why this is correct
Route type 4 (Ethernet Segment route) is used to announce ESI and perform DF election.
Related concept
CIDR notation defines the prefix length.
- ✗
MSTP
Why it's wrong here
MSTP is for spanning tree.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
- CIDR notation defines the prefix length.
- Block size helps identify subnet boundaries.
- Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
- The required host count determines the smallest suitable subnet.
TExam Day Tips
- Write the block size before choosing the subnet.
- Check whether the question asks for hosts, subnets or a specific address range.
- Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-501 subnetting questions on CIDR, address ranges, and subnet selection.
- →
MPLS and Segment Routing — study guide chapter
Learn the concepts, then practise the questions
- →
MPLS and Segment Routing practice questions
Targeted practice on this topic area only
- →
All 350-501 questions
1,000 questions across all exam domains
- →
Cisco SPCOR / CCNP Service Provider Core 350-501 study guide
Full concept coverage aligned to exam objectives
- →
350-501 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related 350-501 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
MPLS and Segment Routing practice questions
Practise 350-501 questions linked to MPLS and Segment Routing.
Automation and Quality of Services practice questions
Practise 350-501 questions linked to Automation and Quality of Services.
Architecture practice questions
Practise 350-501 questions linked to Architecture.
Networking practice questions
Practise 350-501 questions linked to Networking.
Security and Services practice questions
Practise 350-501 questions linked to Security and Services.
Automation and Quality of Service practice questions
Practise 350-501 questions linked to Automation and Quality of Service.
Services practice questions
Practise 350-501 questions linked to Services.
Automation and Assurance practice questions
Practise 350-501 questions linked to Automation and Assurance.
350-501 fundamentals practice questions
Practise 350-501 questions linked to 350-501 fundamentals.
350-501 scenario practice questions
Practise 350-501 questions linked to 350-501 scenario.
350-501 troubleshooting practice questions
Practise 350-501 questions linked to 350-501 troubleshooting.
Practice this exam
Start a free 350-501 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this 350-501 question test?
MPLS and Segment Routing — This question tests MPLS and Segment Routing — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: DF election via ESI label and route type 4 — The DF election is performed using a deterministic algorithm based on the ESI and the list of PEs, with the lowest IP address becoming DF.
What should I do if I get this 350-501 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related 350-501 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jul 4, 2026
This 350-501 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 350-501 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.