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The networking foundation every security and infrastructure career is built on.
Anyone who needs to actually understand networks: future network admins, and security folks who are tired of hand-waving past "how does the packet get there?"
~100–120 questions · 120 minutes · single exam · valid 3 years
Three tasters — the real track has hundreds, graded, with full rationale.
B. A /29 leaves 3 host bits: 2^3 = 8 addresses, minus the network and broadcast addresses = 6 usable hosts.
B. A traditional switch forwards frames using MAC addresses, which live at Layer 2. Routers operate at Layer 3 using IP addresses.
B. DHCP leases IP configuration to clients automatically. DNS resolves names to addresses, ARP maps IP to MAC, ICMP handles diagnostics like ping.
The full Cisco CCNA track — lectures, graded checks and labs — is free to start. Create an account to save your progress, earn points and climb the leaderboard.