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Which one of the following routing protocols do not support VLSM and CIDR?
Routing Information Protocol is a distance-vector routing protocol with three versions; RIPv1, RIPv2, and RIPng. RIPv1 is a classful routing protocol, thus, VLSM and CIDR is not supported. RIPv2 is the enhanced version of RIPv1. It is a classless routing protocol, thus, supports VLSM and CIDR. RIPng is the IPv6 version of RIP and is a classless routing protocol. EIGRP is a classless routing protocol developed by Cisco. OSPF and IS-IS is a link-state routing protocol. Both are classless routing protocols.
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