A quick revision notes for CCNA exam is available at examguides.com The CCNA exam cram notes is useful for those who are in the final stage preparation. The exam notes covers recent topics as included in CCNA certification.
The topics covered in the exam cram notes include TCP/IP vs. OSI model, IP v4 subnetting, binary and decimal systems, network IP address planning, routing using RIP, EIGRP, OSPF and BGP, VLANs and VTP, extended, standard, and named Access Control Lists (ACLs), cloud services, network security using firewalls, STP protocol, Site to Site, and Remote to Site secure communication, and others.
Other exam notes available include CCNP ENCOR exam cram, and CCNP ENARSI exam cram.
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For quick reference view this CCNA Cheatsheets