- A
Controllers in the same mobility group must be in the same IP subnet.
Why wrong: Incorrect because mobility groups can span different subnets and even different geographic locations; they communicate via IP tunnels.
- B
A mobility group can contain up to 24 controllers.
Correct because Cisco WLCs support a maximum of 24 controllers in a single mobility group.
- C
Mobility groups enable seamless client roaming between controllers without re-authentication.
Correct because mobility groups allow clients to roam between controllers while maintaining their security context, avoiding full re-authentication.
- D
Mobility tunnels between controllers must be symmetric and use the same source and destination IP addresses.
Correct because mobility tunnels are established using the management IP addresses of the controllers, and the tunnel endpoints must be reachable from both sides.
- E
All controllers in a mobility group must be the same hardware model.
Why wrong: Incorrect because mobility groups can include different models of Cisco WLCs (e.g., 5508, 8540, virtual WLC) as long as they run compatible software versions.
Quick Answer
The answer is that mobility tunnels between controllers must be symmetric and use the same source and destination IP addresses. This is correct because a Cisco WLC mobility group relies on a full mesh of IPsec or EoIP tunnels between all member controllers, and for these tunnels to function properly, each controller must use the same pair of IP addresses as both the source and destination for every peer connection—ensuring bidirectional communication without asymmetric routing. On the ENCOR 350-401 exam, this concept tests your understanding of how seamless client roaming is achieved across controllers, and a common trap is assuming controllers can be in different subnets or that hardware models must match; in reality, they only need Layer 3 reachability and consistent tunnel endpoints. Remember the memory tip: “Same IP pair for every peer, or roaming disappears.”
350-401 Wireless Infrastructure Practice Question
This 350-401 practice question tests your understanding of wireless infrastructure. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 three statements about Cisco Wireless LAN Controller (WLC) mobility groups are true? (Choose three.)
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
A mobility group can contain up to 24 controllers.
Mobility groups allow seamless client roaming across controllers, support up to 24 controllers per group, require symmetric mobility tunnels, and use a backup controller list for redundancy. They do not require all controllers to be in the same subnet or same hardware model.
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.
- ✗
Controllers in the same mobility group must be in the same IP subnet.
Why it's wrong here
Incorrect because mobility groups can span different subnets and even different geographic locations; they communicate via IP tunnels.
- ✓
A mobility group can contain up to 24 controllers.
Why this is correct
Correct because Cisco WLCs support a maximum of 24 controllers in a single mobility group.
Related concept
CIDR notation defines the prefix length.
- ✓
Mobility groups enable seamless client roaming between controllers without re-authentication.
Why this is correct
Correct because mobility groups allow clients to roam between controllers while maintaining their security context, avoiding full re-authentication.
Related concept
CIDR notation defines the prefix length.
- ✓
Mobility tunnels between controllers must be symmetric and use the same source and destination IP addresses.
Why this is correct
Correct because mobility tunnels are established using the management IP addresses of the controllers, and the tunnel endpoints must be reachable from both sides.
Related concept
CIDR notation defines the prefix length.
- ✗
All controllers in a mobility group must be the same hardware model.
Why it's wrong here
Incorrect because mobility groups can include different models of Cisco WLCs (e.g., 5508, 8540, virtual WLC) as long as they run compatible software versions.
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 350-401 subnetting questions on CIDR, address ranges, and subnet selection.
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FAQ
Questions learners often ask
What does this 350-401 question test?
Wireless Infrastructure — This question tests Wireless Infrastructure — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: A mobility group can contain up to 24 controllers. — Mobility groups allow seamless client roaming across controllers, support up to 24 controllers per group, require symmetric mobility tunnels, and use a backup controller list for redundancy. They do not require all controllers to be in the same subnet or same hardware model.
What should I do if I get this 350-401 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 350-401 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
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Last reviewed: Jun 18, 2026
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