CCNA Notes are available for sale in PDF format at Tech With Ravish which includes all the command configuration related to the topics like OSI model, ipv4 addressing, subnetting, VLAN, Trunking, DTP protocol, VTP protocol, STP protocol, RSTP protocol Port fast, Port Security, CDP Protocol, DHCP protocol, Static route, Default route OSPF protocol, OSPF 7 States, OSPF Area, Stub area, NSSA area, RIP Protocol, EIGRP Protocol, ACL, NAT, HSRP protocol and VRRP protocol, IPv6, GRE VPN, Tunnel, Wireless networks