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
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
★ 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 · ::
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
★ 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
★ SECURITY / ACL
DRILL
DOMAIN 5
ACL MATCHING DRILL
Randomized ACL + packet pairs. Predict which line catches the packet under first-match-wins top-down evaluation. Three difficulty modes (standard / extended / mixed). Field-by-field walkthrough on every answer plus a classic-trap callout when you pick a line that would match but isn't the first one.
Top-Down Evaluation · Implicit Deny · Wildcard Masks · Extended ACL Match Fields
★ REFERENCE
CHEAT SHEET
CISCO IOS
CLI CHEAT SHEET
Cisco IOS commands across 12 CCNA topics — VLAN, inter-VLAN, STP, EtherChannel, OSPF (single + multi-area), static routing, ACL, NAT/PAT, DHCP, CDP/LLDP, IPv6. Each topic has config templates, show commands, and a classic gotcha. Copy-paste ready. Print-friendly.
VLAN · OSPF · ACL · NAT · DHCP · STP · EtherChannel · IPv6
[ ★ 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.
[ ★ WHAT'S COMING ]
More drills are queued — VLSM splitter, wildcard-mask converter, OSPF neighbor-state quiz, FHRP/HSRP election. Want one in particular? Send it through on the contact page._