CCNP Infrastructure Practice Question
A network architect is designing a controller-based wireless deployment for a large campus. The requirement is to provide seamless roaming for voice clients across Layer 3 boundaries while keeping the client IP address unchanged. Which Cisco SD-Access fabric feature should be used to meet this requirement?
⚠ Common exam trap
The trap here is assuming that traditional WLC mobility groups or Layer 2 flooding are sufficient for seamless Layer 3 roaming in an SD-Access fabric.
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
✓
Enable IP mobility on the fabric edge nodes and configure the fabric control plane to track client locations.
In Cisco SD-Access, IP mobility is the feature that enables seamless roaming across Layer 3 boundaries while preserving the client IP address. The fabric control plane node tracks endpoint locations, and edge nodes use VXLAN encapsulation to forward traffic to the correct edge. This is essential for voice clients that require uninterrupted connectivity during roaming.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the fabric to use VXLAN with Layer 2 flooding and enable ARP proxy on the edge nodes.
Why it's wrong here
VXLAN with Layer 2 flooding and ARP proxy helps with Layer 2 extension but does not inherently provide seamless Layer 3 roaming with IP address preservation. It may cause broadcast propagation and does not leverage the fabric's native mobility mechanisms. This approach is more suited for basic Layer 2 stretch and does not address the specific requirement of maintaining IP addresses across Layer 3 boundaries for voice clients.
- ✗
Deploy a dedicated WLC in each building and configure inter-controller roaming with mobility groups.
Why it's wrong here
While inter-controller roaming with mobility groups can support Layer 3 roaming, it requires that the WLCs be in the same mobility group and that the client's anchor controller remains the same. This adds complexity and may not provide the seamless experience required for voice clients. It also does not leverage the SD-Access fabric's native IP mobility, which is designed to handle this scenario more efficiently.
- ✗
Configure the fabric edge nodes to run HSRP on the anycast gateway and enable preemption for fast failover.
Why it's wrong here
HSRP on the anycast gateway provides default gateway redundancy, but it does not address client mobility across Layer 3 boundaries. The anycast gateway is already distributed across edge nodes, and HSRP is not used in SD-Access for this purpose. Enabling preemption could cause unnecessary failover and does not help maintain client IP addresses during roaming.
- ✓
Enable IP mobility on the fabric edge nodes and configure the fabric control plane to track client locations.
Why this is correct
Cisco SD-Access fabric supports IP mobility, which allows a client to roam across Layer 3 boundaries while keeping its IP address. The fabric control plane node (using LISP) tracks endpoint locations, and the edge nodes encapsulate traffic in VXLAN. When a client roams, the new edge node registers the client's new location, and the fabric forwards traffic to the correct edge, ensuring seamless roaming without IP address change.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Cisco exam blueprint
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