Question 351 of 1,000

Advanced VPN and Zero Trust →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the gateway is acting as an ADVPN hub and will advertise routes to spokes for shortcut tunnel creation. This is correct because when auto-discovery is enabled on an IKE gateway in FortiOS, it instructs the hub to send shortcut route advertisements to its spokes, allowing those spokes to learn each other’s public IP addresses and establish direct tunnels without traversing the hub. On the Fortinet NSE 7 Advanced Security NSE7 exam, this output tests your ability to interpret real-world diagnostic commands and distinguish between a hub and a spoke in an ADVPN topology—a common trap is confusing this with a simple dynamic VPN or assuming auto-discovery only applies to spokes. Remember the key distinction: the hub enables auto-discovery to facilitate shortcut creation, while spokes receive those advertisements to initiate the shortcuts. A useful memory tip is “Hub advertises, Spoke shortcuts”—if you see auto-discovery enabled on the hub’s gateway list, think of it as the hub broadcasting the invitation for direct spoke-to-spoke tunnels.

NSE7 Advanced VPN and Zero Trust Practice Question

This NSE7 practice question tests your understanding of advanced vpn and zero trust. 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.

You run 'diagnose vpn ike gateway list' and see the following: gateway name: HUB_GW version: IKEv2 state: UP mode: main local: 10.0.0.1:500 remote: 203.0.113.5:500 auth: psk dpd: on rekey: 86400 num_peers: 2 total_tunnels: 2 auto-discovery: enabled What does the 'auto-discovery: enabled' indicate about this VPN gateway?

Question 1hardmultiple choice

Read the full VPN explanation →

A
The gateway will automatically create new phase2 selectors for any remote subnet
Why wrong: Auto-discovery is not about automatic phase2 selectors; it is a feature of ADVPN to enable dynamic shortcut tunnels.
B
The gateway is acting as an ADVPN hub and will advertise routes to spokes for shortcut tunnel creation
When auto-discovery is enabled on a gateway, it can act as an ADVPN hub, sending route information to spokes to allow direct spoke-to-spoke tunnels.
C
The gateway will automatically renegotiate IKEv2 keys before expiration
Why wrong: Key renegotiation is controlled by the 'rekey' timer, not the auto-discovery setting.
D
The gateway will discover other VPN gateways on the same network and form peer relationships
Why wrong: Auto-discovery in FortiGate VPN is specifically for ADVPN shortcut tunnels, not for discovering new peers automatically.

Full breakdown with real-world context →

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 gateway is acting as an ADVPN hub and will advertise routes to spokes for shortcut tunnel creation

In an ADVPN setup, enabling auto-discovery on the hub allows it to send shortcut route advertisements to spokes, which then can establish direct tunnels. The output confirms the gateway is configured to participate in ADVPN as a hub or as a spoke that can initiate shortcuts.

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.

✗
The gateway will automatically create new phase2 selectors for any remote subnet
Why it's wrong here
Auto-discovery is not about automatic phase2 selectors; it is a feature of ADVPN to enable dynamic shortcut tunnels.
✓
The gateway is acting as an ADVPN hub and will advertise routes to spokes for shortcut tunnel creation
Why this is correct
When auto-discovery is enabled on a gateway, it can act as an ADVPN hub, sending route information to spokes to allow direct spoke-to-spoke tunnels.
Related concept
CIDR notation defines the prefix length.
✗
The gateway will automatically renegotiate IKEv2 keys before expiration
Why it's wrong here
Key renegotiation is controlled by the 'rekey' timer, not the auto-discovery setting.
✗
The gateway will discover other VPN gateways on the same network and form peer relationships
Why it's wrong here
Auto-discovery in FortiGate VPN is specifically for ADVPN shortcut tunnels, not for discovering new peers automatically.

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 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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related NSE7 subnetting questions on CIDR, address ranges, and subnet selection.

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FAQ

Questions learners often ask

What does this NSE7 question test?

Advanced VPN and Zero Trust — This question tests Advanced VPN and Zero Trust — CIDR notation defines the prefix length..

What is the correct answer to this question?

The correct answer is: The gateway is acting as an ADVPN hub and will advertise routes to spokes for shortcut tunnel creation — In an ADVPN setup, enabling auto-discovery on the hub allows it to send shortcut route advertisements to spokes, which then can establish direct tunnels. The output confirms the gateway is configured to participate in ADVPN as a hub or as a spoke that can initiate shortcuts.

What should I do if I get this NSE7 question wrong?

What is the key concept behind this question?

CIDR notation defines the prefix length.

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