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TOOLS_

Skip the reading. Drill the concepts. Every tool runs in the browser, every answer graded instantly, no signup.

★ FULL CCNA STUDY HUB ★ Every tool, lab, and article mapped to the official Cisco 200-301 blueprint ▶

★ SUBNETTING

DRILL IPV4
SUBNETTING PRACTICE Drill IPv4 subnetting with random questions. Solve network, first host, last host, broadcast, next and previous subnet. Per-field grading and instant feedback. CIDR · VLSM · Network ID · Broadcast · Host Range
▶ LAUNCH TOOL
DRILL IPV6
IPV6 SUBNETTING PRACTICE Compress and expand IPv6 addresses, derive the network prefix, walk the next and previous subnet at any /N. Full 128-bit math, lenient compression grading. IPv6 · Compress · Expand · /N Prefix · Adjacent Subnets
▶ LAUNCH TOOL

★ IPV6

QUIZ 10 QUESTIONS
IPV6 ADDRESS TYPES QUIZ Identify Global Unicast, Unique Local, Link-Local, Multicast, Loopback and Unspecified addresses at a glance. 10 questions, instant feedback with the prefix rule for each. 2000::/3 · fc00::/7 · fe80::/10 · ff00::/8 · ::1 · ::
▶ START QUIZ
DRILL EUI-64
EUI-64 PRACTICE Convert a MAC into a Modified EUI-64 interface ID and full IPv6 address. Step-by-step graded — flipped first byte, full interface ID, complete address. Walkthrough button shows the bit-level work. U/L Bit Flip · FF:FE Insert · Interface ID · SLAAC
▶ LAUNCH TOOL

★ L2 / SWITCHING

INTERACTIVE LAB STP
STP ROOT BRIDGE ELECTION Walk the 4-step STP algorithm — root bridge → root ports → designated ports → blocked ports. Quiz mode tests each step. Sandbox lets you change priorities and watch STP recalculate live. Root Bridge · BID · Path Cost · Port Roles · BPDU
► LAUNCH INTERACTIVE LAB
[ ★ STAYS-ON-THE-DESK REFERENCE ] Not a tool — but every prefix /8 through /32 in one page. Save the image or bookmark the URL and never re-derive a mask again.
CIDR CHEAT SHEET ▶
[ ★ WHAT'S COMING ] More drills are queued — VLSM splitter, wildcard-mask converter, OSPF neighbor-state quiz, ACL builder. Want one in particular? Send it through on the contact page._
[ ★ FREE SUBNETTING CHEAT SHEET ]

Get the full IPv4 subnetting cheat sheet — every prefix /8 to /32 with subnet mask, block size, host counts, and wildcard mask — the moment you subscribe. Then new labs and articles as they drop. No spam. Unsubscribe any time.