How Is Mobility Group Security Enhanced Between AireOS and IOS-XE Controllers?

300-425 By islever Editorial Last updated

Validate mobility tunneling for data and control path Design mobility groups based on mobility roles

Short answer

C Enable Mobility Encryption on the network so data and control traffic between AireOS and Cisco IOS-XE mobility group members is encrypted.

Question

A network consultant is designing a wireless network for a government agency. The customer requires high security between any device communication. The design includes AireOS, Cisco IOS-XE controllers, and Cisco 4800 Series APs. Which requirement must be met to enhance the mobility group security?
  1. Use a different group name for each mobility member.
  2. Enable MIC authentication between the mobility group members.
  3. Enable Mobility Encryption on the network. Correct Answer
  4. Use a complex group name for the mobility group.

Key Takeaways

The question tests which mobility group hardening setting actually secures traffic moving between controllers — the trap is choosing MIC authentication or a complex mobility group name, neither of which encrypts the EoIP data and control path.

A government wireless design built on AireOS controllers, Cisco IOS-XE (Catalyst 9800) controllers and 4800 Series APs must guarantee high security between every device, so the mobility group itself has to protect controller-to-controller traffic. This page establishes that enabling Mobility Encryption (C) is the requirement that secures the mobility tunnel, while MIC authentication and group-name tricks fall short.

Common mistake: Learners pick MIC authentication (B) because it sounds like the extra security control the scenario is asking for, but MIC only authenticates and validates peer messages between mobility members — it provides no confidentiality for the data and control traffic, which is exactly what the 'high security between any device communication' requirement demands.

Expert Analysis

Why the Answer Is Correct

Enabling Mobility Encryption (C) is the only listed option that protects the actual traffic exchanged between mobility group members, which is what the government agency's requirement of "high security between any device communication" targets. In a mixed deployment where AireOS controllers and Cisco IOS-XE controllers form one mobility group and 4800 Series APs anchor clients across it, client data and control messages traverse EoIP tunnels between the peers, and Mobility Encryption encrypts that tunnel traffic. Option C is therefore the requirement that must be met to strengthen mobility group security at the transport level rather than merely at the naming or peer-validation level.

Why the Other Options Are Wrong

Option B (MIC authentication between mobility group members) validates the authenticity and integrity of messages between peers but leaves the payload in the mobility tunnel in clear text, so it does not satisfy a confidentiality requirement. Option A (a different group name for each mobility member) is actively harmful: members must share the same mobility group name to form a group and establish tunnels, so this would break mobility rather than secure it. Option D (a complex group name) is weak hardening at best — the name is an identifier, not an encryption mechanism, and it does not encrypt anything by itself, so it cannot be the requirement that secures device-to-device communication.

Community Comment Notes

Most voters land on C, with Bembs stating succinctly "Encrypt the mobility tunnel" and albiprx explaining that encrypted data and control traffic between controllers is "critical for maintaining high security" in sensitive environments. A minority, including Farhad123 and ShamsDimashki, chose B and argued that "Mobility encryption is enabled by default", so MIC is the genuine incremental hardening step. That point has merit on newer AireOS and IOS-XE code where encryption defaults to on, but the scenario is written as a design requirement for securing controller communication, so the option that guarantees encryption of the mobility tunnel still governs. The group-name options (A and D) drew no community support at all, confirming they are distractors.

Exam Strategy

Read the requirement verb for security questions: confidentiality language ("high security between any device communication") points to the encryption option, while integrity/authentication language points to MIC. Also memorise that in AireOS and Cisco IOS-XE mobility configurations the group name is a shared identifier, so any option that changes names per member or treats the name as a security control is a distractor.

Frequently Asked Questions

Why is MIC authentication (B) not enough for the government agency requirement?

MIC authentication only verifies that mobility peers are legitimate and that their messages are intact; it does not encrypt the data and control traffic in the mobility tunnel, so device-to-device confidentiality is not achieved.

Does a complex mobility group name (D) secure the mobility group?

No. The group name is a shared identifier that members must match to form the group; it hardens nothing by itself and can never substitute for enabling Mobility Encryption on the controllers.

What happens if each mobility member uses a different group name (A)?

Members with mismatched group names do not join the same mobility group, so the EoIP tunnels between the AireOS and IOS-XE controllers never come up and mobility breaks entirely.

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Community Votes

C
75%
B
25%

75% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 4 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 4

  1. albiprx 👍 3 Answered C
    C. Enable Mobility Encryption on the network. Here’s why: Mobility Encryption: Enabling mobility encryption ensures that the data and control traffic exchanged between controllers in a mobility group is encrypted. This is critical for maintaining high security, especially in environments where sensitive information is transmitted. MIC Authentication: While MIC (Message Integrity Check) authentication is important for ensuring the integrity of messages exchanged between mobility group members, it does not provide encryption. MIC alone might not be sufficient for the high-security requirements of a government agency. Mobility Group Names: Using a different group name for each mobility member or a complex group name can help with organizational clarity and might add a layer of security through obscurity. However, these measures are not substitutes for proper encryption mechanisms.
  2. Bembs 👍 3 Answered C
    C. Encrypt the mobility tunnel
  3. ShamsDimashki 👍 1 Answered B
    The mobility encryption is mandatory, and the peer will not established without encryption The question mentioned to "Enhance" the security which is the right answer with using the MIC
  4. Farhad123 👍 1 Answered B
    I would say also B , as Mobility encryption is enabled by default

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