CCMP

Q: How deeply does Acing the CCNA Exam: Volume 2 Advanced Networking and Security cover CCMP?

Explains AES counter mode and CBC-MAC, but defers counter-mode details beyond the CCNA exam scope.

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

CCMP is an IEEE 802.11 wireless security protocol that combines AES counter-mode encryption with CBC-MAC-based message authentication.

CCMP secures wireless LAN traffic by providing both data encryption and integrity protection. It is associated with IEEE 802.11i and WPA2, replacing the weaker RC4-based approach used by WEP and TKIP. section 20.3.2 section 20.5

CCMP uses AES in counter mode for encryption: an encrypted counter value changes for each data block, producing a unique encryption basis. CBC-MAC supplies a stronger integrity checksum than TKIP’s MIC. Counter-mode internals are outside the stated CCNA exam scope. section 20.3.2

Important comparisons:

WEP and TKIP use RC4, whereas CCMP uses AES. section 20.3.2
WPA3 uses GCMP, which supports AES counter mode with 128-bit or 256-bit keys; CCMP uses 128-bit keys. section 20.5

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

Cover of Acing the CCNA Exam: Volume 2 Advanced Networking and Security

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Related concepts

AESuses · The Advanced Encryption Standard (AES) is a symmetric block cipher that encrypts and decrypts data in 128-bit blocks using 128-, 192-, or 256-bit keys.
WPA3used by · WPA3 is a Wi-Fi security standard that strengthens wireless authentication and encryption while improving resistance to password-guessing attacks.
counter mode encryptionuses · Counter mode encryption generates a keystream by encrypting successive counter values with a block cipher and combines it with plaintext to produce ciphertext.
WPA2used by · WPA2 is a Wi-Fi security standard based on IEEE 802.11i that protects wireless communications through authentication and encryption.
GCMPalternative to · GCMP is a wireless data-protection protocol that combines AES counter-mode encryption with GMAC integrity protection.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.