Step After EAP Success in EAP-TLS Session

Describe wireless security protocols (WPA, WPA2, and WPA3) Define key security concepts (threats, vulnerabilities, exploits, and mitigation techniques)

Answer Correct answer: B — the four-way handshake runs immediately after the EAP success message to derive and install the session keys.

Which step immediately follows receipt of the EAP success message when session resumption is disabled for an EAP-TLS connection?

PMKID caching
four-way handshake Correct Answer
802.1X authentication
EAPOL-key frame

Community Insight

The exam tests whether you can order the 802.1X/EAP-TLS phases: the trap is choosing the message format (an EAPOL-Key frame) or the umbrella process (802.1X authentication) instead of the actual protocol step, which is the four-way handshake.

This question covers the EAP-TLS wireless authentication sequence, specifically what happens right after the authenticator relays the EAP success message when session resumption (and thus PMKID/fast reconnection caching) is disabled. The page establishes that the immediate next step is the 802.11 four-way handshake, which derives and installs the PTK used to encrypt the session.

Many learners choose D (EAPOL-Key frame) because the EAPOL-Key frames appear immediately after EAP success; but a single frame is a message, not a step — those frames are the constituents of the four-way handshake, so D describes the medium rather than the procedure. C is also a frequent pick, since 802.1X is the overall framework that was already in progress, not a subsequent step.

Community Discussion (17 comments)

Tompoo 👍 1 Selected: B

For an EAP-TLS connection with session resumption disabled, the basic sequence is: 802.1X/EAP authentication → EAP Success → WPA/WPA2 four-way handshake → encrypted data After successful EAP-TLS authentication, the authentication server sends an EAP-Success message. The client and AP then perform the four-way handshake to derive/install the encryption keys used to protect wireless traffic.

Cloud1128 👍 2 Selected: B

4 way baby

Fakecon 👍 1 Selected: B

Going B here

dhewa 👍 2 Selected: B

Chat GPT: When session resumption is disabled for an EAP-TLS connection, after the EAP success message is received, the next step is the four-way handshake. This is part of the process used to establish a secure session key between the client and the access point in a WPA2 (or similar) environment.

6bd7702 👍 2

..The correct answer is: B. four-way handshake When session resumption is disabled for an EAP-TLS connection, the step that immediately follows the receipt of the EAP success message is the four-way handshake. This handshake is used to establish encryption keys (such as the Pairwise Transient Key, or PTK) for securing the communication between the client (supplicant) and the wireless access point...

JSMM 👍 1

Chat GPT -> An EAPOL-Key frame (Extensible Authentication Protocol over LAN Key frame) is a type of message used in the 802.1X / WPA/WPA2/WPA3 wireless security protocol stack, specifically during the 4-way handshake process between a wireless client (supplicant) and an access point (authenticator).

Rich_rude 👍 1

this is worded really bad,

picho707 👍 4 Selected: D

Here is a more detailed explanation of the steps involved in EAP-TLS authentication when session resumption is disabled: The client sends an EAP-Request message to the authentication server. The authentication server selects an EAP method and sends an EAP-Response message to the client. The client and authentication server exchange EAP messages until the authentication is successful. The authentication server sends an EAP-Success message to the client. The client sends an EAPOL-Key frame to the authenticator. The authenticator sends an EAPOL-Key frame to the authentication server. The authentication server validates the EAPOL-Key frame and sends an EAPOL-Key frame to the authenticator. The authenticator sends an EAPOL-Key frame to the client. The client and authenticator exchange four-way handshake messages to establish a new TLS session. Once the four-way handshake is complete, the client can access the network.

Lse 👍 1

Absolutley, The immediate action upon receipt of the EAP-Success message is the exchange of EAPOL-Key frames to begin the four-way handshake.

lolungos 👍 1 Selected: D

This question is messed up. After the EAP Succes on a EAP-TLS scenario you start the 4-way handshake which is made by 4 EAPOL-KEY frames... Knowing cisco I would go D, but as usual more than one answer may apply

Ciscoman021 👍 4 Selected: C

When session resumption is disabled for an EAP-TLS connection, the step that immediately follows the receipt of the EAP success message is the 802.1X authentication. After the EAP success message is received, the authentication server sends an EAP success message to the supplicant indicating that the authentication was successful, and then the supplicant sends an EAPOL-logoff message to the authenticator to terminate the session. After the session is terminated, the supplicant must re-authenticate the next time it tries to connect to the network. Therefore, the next step in the process is to initiate a new 802.1X authentication exchange between the supplicant and the authenticator, starting with the EAPOL-start frame. Option C, 802.1X authentication, is the correct answer.

loco_desk 👍 3

When session resumption is disabled for an EAP-TLS connection, the step that immediately follows the receipt of the EAP success message is the generation of the Pairwise Master Key (PMK) and the initiation of the four-way handshake. Therefore, the correct answer is B. four-way handshake.

Stichy007 👍 2

answer is definitely D, smh

Rynurr 👍 2 Selected: D

Yeah, "D" looks like correct answer

gewe 👍 3

you are right oatmeal turkey its DDDD

oatmealturkey 👍 3 Selected: D

802.1X is performed by EAP-TLS authentication, 802.1X is not a "step" so C is incorrect. According to this source, what follows the EAP Success message is a series of four EAPOL-Key frames known as the EAPOL-Key exchange: https://www.securew2.com/blog/802-1x-eap-tls-authentication-flow-explained

jonathan126 👍 3

according to your source, EAPOL-key frame is transferred during the four-way handshake process. The EAPOL-key frame is not a step, but the EAPOL-key frame exchange could be a step. So I think C and D are also incorrect, leaving option B the correct answer.

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Expert Analysis

Why the Answer Is Correct

With EAP-TLS session resumption disabled, the supplicant and authenticator complete a full, non-cached authentication, and the EAP success message marks the end of the EAP phase. Immediately afterward, both sides derive the Pairwise Master Key from the TLS-derived material and run the 802.11 four-way handshake (Message 1 through Message 4) to generate and install the Pairwise Transient Key. This handshake is the defined next procedure in the WPA2/WPA3 Enterprise state machine, so option B names the step itself. It is only after the PTK is confirmed that unicast traffic can be encrypted and the port is moved fully to the authorized state.

Why the Other Options Are Wrong

Option A, PMKID caching, is precisely what does not happen: it is a fast-session-resumption mechanism, and the question explicitly states resumption is disabled, so no PMKID is cached or reused. Option C, 802.1X authentication, is the umbrella framework that was already underway — the EAP-TLS exchange just completed is a component of 802.1X, so it cannot be the step that follows its own success message. Option D, EAPOL-Key frame, is a message type rather than a protocol stage: as one commenter observed, the EAPOL-Key frames are transferred during the four-way handshake, so naming a frame does not name the step. Option D therefore describes the contents of the handshake instead of the handshake itself.

Community Comment Notes

The votes split sharply: oatmealturkey argued from a SecureW2 article that "what follows the EAP Success message is a series of four EAPOL-Key frames," supported by picho707 and Stichy007, while loco_desk, Cloud1128, dhewa and 6bd7702 pointed to the four-way handshake. The decisive counter-argument came from jonathan126, who noted that "the EAPOL-key frame is not a step, but the EAPOL-key frame exchange could be a step," and concluded that leaves option B. Ciscoman021's rationale for C is internally inconsistent, since it describes an EAP-logoff flow rather than the step that precedes key installation.

Official Reference

Exam Strategy

When an option names a protocol message (a frame or packet) and another names the procedure that carries those messages, the procedure is usually the intended 'step'. Also read the qualifier in the stem — 'session resumption is disabled' exists to eliminate any caching or fast-reconnect answer.

Frequently Asked Questions

Why isn't the EAPOL-Key frame the correct step after EAP success?

An EAPOL-Key frame is a single message, not a protocol stage. Those frames are the messages exchanged inside the four-way handshake, so the handshake itself is the step being named.

Why is PMKID caching wrong when session resumption is disabled?

PMKID caching is a fast-resumption feature that reuses a cached master key. Since the question disables session resumption, a full EAP-TLS exchange occurs and no PMKID is stored or matched.

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