Which of the following is an interoperable protocol that enables a controller to manage a collection of wireless access points?

A.
CCMP

B.
CAPWAP

C.
CHAP

D.
IAPP

Explanation:
CAPWAP (Control and provisioning of wireless access points) is based on LWAPP (Lightweight access point protocol). CAPWAP is a standard, interoperable protocol that enables a controller to manage a collection of wireless access points. The important feature provided by CAPWAP is the optional support of encryption, which was not offered by LWAPP. It uses datagram transport layer security (DTLS) as its security algorithm. It uses UDP ports 5246 and 5247. Answer option D is incorrect. Inter Access Point Protocol (IAPP) is an IEEE 802.11F standard that allows communication between different APs over UDP. This protocol is designed for the enforcement of unique association throughout an Extended Service Set and for secure exchange of station’s security context between the current AP and the new AP during the handoff period. Answer option A is incorrect. CCMP (Counter Mode with Cipher Block Chaining Message Authentication Code Protocol) is an IEEE 802.11i encryption protocol created to replace both TKIP, the mandatory protocol in WPA, and WEP, the earlier, insecure protocol. CCMP is a mandatory part of the WPA2 standard, an optional part of the WPA standard, and a required option for Robust Security Network (RSN) Compliant networks. CCMP is also used in the ITU-T home and business networking standard.
CCMP, part of the 802.11i standard, uses the Advanced Encryption Standard (AES) algorithm. Unlike in TKIP, key management and message integrity is handled by a single component built around AES using a 128-bit key, a 128-bit block, and 10 rounds of encoding per the FIPS 197 standard. Answer option C is incorrect. Challenge Handshake Authentication Protocol (CHAP) is an authentication protocol that uses a secure form of encrypted authentication. Using CHAP, network dial-up connections are able to securely connect to almost all PPP servers.