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.
A FortiGate is configured with SD-WAN using load balancing algorithm 'source-dest-ip'. What is the primary characteristic of this algorithm?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Traffic is sent to the member with the highest bandwidth.
Why wrong: No SD-WAN algorithm uses bandwidth as the sole criterion.
B
Traffic is sent to the member with the lowest cost metric.
Why wrong: Lowest-cost is a different algorithm that uses cost values assigned to members.
C
Traffic is distributed evenly across all SD-WAN members regardless of source or destination.
Why wrong: That describes 'volume' or 'session' algorithms, not source-dest-ip.
D
All traffic from the same source IP to the same destination IP uses the same SD-WAN member.
Source-dest-ip hashing ensures that traffic belonging to the same source-destination pair is consistently sent over the same link, preserving session affinity.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
All traffic from the same source IP to the same destination IP uses the same SD-WAN member.
The source-dest-ip algorithm uses a hash of source and destination IP addresses to select the outgoing interface, ensuring that all packets of a given session go through the same link.
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 highest bandwidth.
Why it's wrong here
No SD-WAN algorithm uses bandwidth as the sole criterion.
✗
Traffic is sent to the member with the lowest cost metric.
Why it's wrong here
Lowest-cost is a different algorithm that uses cost values assigned to members.
✗
Traffic is distributed evenly across all SD-WAN members regardless of source or destination.
Why it's wrong here
That describes 'volume' or 'session' algorithms, not source-dest-ip.
✓
All traffic from the same source IP to the same destination IP uses the same SD-WAN member.
Why this is correct
Source-dest-ip hashing ensures that traffic belonging to the same source-destination pair is consistently sent over the same link, preserving session affinity.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside 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 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: All traffic from the same source IP to the same destination IP uses the same SD-WAN member. — The source-dest-ip algorithm uses a hash of source and destination IP addresses to select the outgoing interface, ensuring that all packets of a given session go through the same link.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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