multi domain only allows 1 endpoint per domain
the question states multiple data clients , so you can't use this
the only solution is to use multi-auth
Multiauthentication Mode
Available in Cisco IOS Release 12.2(50)SG, multiauthentication mode allows one client on the voice VLAN and multiple authenticated clients on the data VLAN.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/12-2/50sg/configuration/guide/Wrapper-46SG/dot1x.html#wp1240475
Multiple Authentication Mode: Multiple Authentication mode (often called multi-auth mode) allows one 802.1X or MAB client on the voice VLAN. It also allows multiple authenticated 802.1X, MAB, or web authorization clients on the data VLAN. When a hub or access point is connected to an 802.1X port, multi-auth mode provides enhanced security over the multi-hosts mode by requiring authentication of each connected client. For non-802.1X devices, MAB, or web-based authentication, can be used as the fallback method for individual host authentications, which allows different hosts to be authenticated through different methods on a single port.
D - MDA is the correct answer
802.1x Host Mode -
The switch supports multidomain authentication (MDA), which allows both a data device and a voice device, such as an IP Phone (Cisco or non-Cisco), to connect to the same switch port.
https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-6/configuration_guide/sec/b_166_sec_9300_cg/configuring_ieee_802_1x_port_based_authentication.html
https://www.cisco.com/c/en/us/support/docs/lan-switching/8021x/98523-8021x-cat-layer3.html#MDA
" Introduction
Multi-Domain Authentication allows an IP Phone and a PC to authenticate on the same switch port while it places them on appropriate Voice and Data VLANs. This document explains how to configure IEEE 802.1x Multi-Domain Authentication (MDA) on Cisco Catalyst Layer 3 fixed configuration switches"
no correct, improtant detail in the question : "" multiple data endpoints"
with multi-domain you have one DATA device and one voice device, so you msut configure multi auth if you want multiple data devices
Wrong. The switch supports multidomain authentication (MDA), which allows both a data device and a voice device, such as an IP Phone (Cisco or non-Cisco), to connect to the same switch port.
The correct answer is D. To allow voice and multiple data endpoints on a switch port configured with 802.1X authentication, the authentication host-mode multi-domain command must be used on the port. This command allows the port to support multiple devices or domains after successful authentication, including voice and data devices.
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