Which of the following routing protocols do NOT support VLSM (variable length subnet masking)?

RIPv1
IGRP
Explanation/Reference:
Explanation:
RIP version 1 and IGRP are classful IP routing protocols. They do not support variable length subnet masks.

Incorrect Answers:
C, D, E, F. Static routing, OSPF, IS-IS, EIGRP, BGP, and RIP version 2 all support VLSM.
A groan grasps the peanut near the offending anthology.