MC-LAG provides link and node protection from an MDU to 3 or more PE devices.

The statement is incorrect. Multi-Chassis Link Aggregation (MC-LAG) is a resiliency feature designed to provide link and node-level protection by enabling a downstream device, such as an MDU, to connect to a pair (2) of upstream Provider Edge (PE) devices. These two PE nodes form a redundant group and appear as a single logical system to the MDU from a Link Aggregation Control Protocol (LACP) perspective. The fundamental architecture of MC-LAG is based on a two-chassis system and does not support extending a single MC-LAG group to three or more PE devices.

The "True" option is incorrect because the assertion that MC-LAG provides protection to "3 or more PE devices" is factually inaccurate. The technology is explicitly defined for a two-node, or dual-homed, redundancy model.

1. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR Layer 2 Services and EVPN Guide: VPLS, Release 22.10.R1.

Section: Multi-chassis LAG

Reference: "MC-LAG is a feature that provides link and node level redundancy. It enables a customer premises equipment (CPE) or a downstream network node to be dual-homed to a pair of 7450 ESS, 7750 SR, or 7950 XRS nodes." This text explicitly states that the feature connects a device to a "pair" of nodes, which means exactly two.

2. Nokia 7750 SR OS Triple Play Service Delivery Architecture Guide, Release 16.0.R1.

Section: 4.2.2. Multi-Chassis Link Aggregation Group

Reference: "Multi-Chassis Link Aggregation Group (MC-LAG) is a feature that provides link and node level redundancy. It enables a downstream network node to be dual-homed to a pair of 7750 SR nodes." This guide reinforces the two-node architecture for MC-LAG in a triple-play service context.

3. Nokia Data Center Fabric Solution Guide.

Section: 3.2.2. MC-LAG for server dual-homing

Reference: "With MC-LAG, a server can be dual-homed to two ToR switches that appear as a single switch to the server... The two ToR switches are configured as an MC-LAG pair." This document, while focused on data centers, confirms the universal two-node principle of the Nokia MC-LAG implementation.