The correct answer is that traffic is distributed to the WAN member with the least number of bytes transmitted, resulting in a balanced distribution proportional to bandwidth. This is because the SD-WAN volume load balancing algorithm on FortiGate tracks the cumulative byte count sent over each interface and directs new sessions to the member that has transmitted the fewest bytes, rather than using session counts or latency. Over time, this ensures that the traffic ratio matches the bandwidth capacities—here, port1 at 100 Mbps will carry roughly twice the volume of port2 at 50 Mbps, achieving a 2:1 split. On the Fortinet NSE 7 Advanced Security NSE7 exam, this concept tests your understanding of how volume-based algorithms differ from session-based or spillover methods; a common trap is assuming the algorithm balances by session count or instantaneous load. Remember the mnemonic “Volume = Volume” — the algorithm cares only about total bytes sent, not how many sessions are active.
NSE7 Advanced Networking and SD-WAN Practice Question
This NSE7 practice question tests your understanding of advanced networking and sd-wan. 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.
An administrator configures an SD-WAN rule with the 'volume' load balancing algorithm. The two WAN members have bandwidth capacities: port1 = 100 Mbps, port2 = 50 Mbps. Traffic is HTTP and HTTPS from internal users to the internet. How will the traffic be distributed?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Traffic is sent to the member with the least number of bytes transmitted, resulting in a balanced distribution proportional to bandwidth
Option C is correct. The volume algorithm distributes traffic based on the volume of bytes processed. It sends new sessions to the member with the least amount of traffic volume sent. Over time, traffic is split proportionally to the bandwidth ratio (2:1).
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.
✓
Traffic is sent to the member with the least number of bytes transmitted, resulting in a balanced distribution proportional to bandwidth
Why this is correct
Volume algorithm tracks bytes transmitted and sends new traffic to the least loaded member.
Related concept
Static NAT maps one inside address to one outside address.
✗
All traffic uses port1 until it reaches 100 Mbps, then uses port2
Why it's wrong here
That describes spillover, not volume.
✗
Traffic is distributed evenly session-by-session (round-robin)
Why it's wrong here
The volume algorithm is not round-robin; it uses byte counts.
✗
Source-destination IP pairs are hashed to a specific member
Why it's wrong here
That describes source-dest-ip algorithm.
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 NSE7 NAT questions on configuration and troubleshooting.
Advanced Networking and SD-WAN — This question tests Advanced Networking and SD-WAN — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Traffic is sent to the member with the least number of bytes transmitted, resulting in a balanced distribution proportional to bandwidth — Option C is correct. The volume algorithm distributes traffic based on the volume of bytes processed. It sends new sessions to the member with the least amount of traffic volume sent. Over time, traffic is split proportionally to the bandwidth ratio (2:1).
What should I do if I get this NSE7 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 NSE7 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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Question Discussion
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