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

A. RIPv1
B. IGRP
C. EIGRP
D. OSPF
E. IS-IS
F. RIPv2

Answer: A, B


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.