Two of these statements incorrect on dynamic routing protocols? 1. RIPV2 supports classless routing. 2. In OSPF the use of variable length subnet masks is . illegal. 3.hop count metric are used to select best path on link state protocol 4.OSPF supports classless routing only within the same autonomous system and 3 2 .a O and 21.b O and 5 2.c O and 4 2.d O ?To which layer the hub is specified in the OSI model None of the choices ,a O Network layer .b O Physical layer .c O Data Link layer .d O Session layer .e O What is the IP address of fast-ethernet 0 if we were using the fifth subnet? The net-ID is 192.168.20.0/28- note 1- we should use the last available IP .address in the range of the fifth subnet- note 2- The zero subnet (First valid subnet ) is invalid for this question 192.168.20.94 .a O 192.168.20.254.b O 192.168.20.142.c O 192.168.20.66 .d O