350-401 Question 174
Single answerAn organization has deployed a wireless network across two buildings using a single SSID. Employees frequently move between the two buildings while staying connected to the network. The access points in one building are connected to VLAN 10, while the access points in the other building are connected to VLAN 20. Which solution best ensures seamless client connectivity during roaming between the two buildings?
- A
Configure Layer 2 roaming with a common VLAN across both buildings.
- B
Implement Layer 3 roaming using a mobility controller to manage IP continuity.
- C
Use static IP addresses for clients to avoid the need for roaming solutions.
- D
Deploy separate SSIDs for each building to isolate the traffic and simplify management.
Show answer and explanation
Correct answer: B
Explanation
In this scenario, the two buildings are on different VLANs (VLAN 10 and VLAN 20), and clients need to roam seamlessly between them. Layer 3 roaming is the correct solution because it allows clients to maintain their IP addresses while moving across different VLANs or subnets. Other options, such as Layer 2 roaming, static IP addresses, or separate SSIDs, do not address the requirements for seamless connectivity in this case.
- A. Incorrect.
Layer 2 roaming works when the same VLAN spans across all access points. Since the two buildings are on different VLANs (VLAN 10 and VLAN 20), Layer 2 roaming is not feasible in this scenario.
- B. Correct.
Layer 3 roaming is designed to handle movement across different subnets or VLANs while preserving the client’s IP address. This solution ensures seamless connectivity for clients roaming between VLAN 10 and VLAN 20.
- C. Incorrect.
Static IP addresses are not practical for mobile clients in a roaming environment, as they do not support dynamic changes in network topology and can lead to connectivity issues.
- D. Incorrect.
Using separate SSIDs for each building would require the client to disconnect from one SSID and reconnect to the other, which disrupts seamless connectivity and does not qualify as a roaming solution.