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Part 1: https://youtu.be/JwE-gCdx3ag
Unequal Load Balance (Variance):
Every routing protocol supports equal cost path load balancing. In addition, Interior Gateway Routing Protocol (IGRP) and EIGRP also support unequal cost path load balancing. Use the variance n command in order to instruct the router to include routes with a metric of less than n times the minimum metric route for that destination. The variable n can take a value between 1 and 128. The default is 1, which means equal cost load balancing. Traffic is also distributed among the links with unequal costs, proportionately, with respect to the metric.
EIGRP Authentication MD5:
By default, no authentication is used for EIGRP packets. You can configure EIGRP to use MD5 authentication. When EIGRP neighbor authentication has been configured on a router, the router authenticates the source of each routing update packet that it receives.