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While Volume 1 focuses on the fundamentals (Ethernet, IPv4/IPv6 routing, and wireless LANs), dives into the critical "Next-Gen" topics required for the modern network engineer:
Mastering security at the router level.
The "new" side of CCNA, covering REST APIs, Puppet, Chef, and JSON. Why You Should Be Careful with "Free PDF" Sites
Learning about cloud, WAN, and SDA architectures. Many libraries and universities provide free access to
Understanding DHCP snooping, dynamic ARP inspection, and device hardening.