Which of the following routing protocols do NOT support VLSM (variable length subnet masking)? (Choose all that apply).

Which of the following routing protocols do NOT support VLSM (variable length
subnet masking)? (Choose all that apply).

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.