CCNA Lab: VLSM Right-Sizing from One /24

Bundle lab · $29.99

Practice deterministic VLSM planning and interface addressing on two Cisco IOS routers. Starting from a single /24, allocate three right-sized IPv4 subnets (two LANs represented by loopbacks and one router-to-router WAN) and configure exact interface addresses and masks. No routing protocols or static routes are configured; verification focuses on directly connected reachability and show commands.

Learning objectives

• Plan a VLSM allocation from a single /24 to meet distinct host requirements with minimal waste
• Apply deterministic IPv4 interface addressing on IOS (ip address <addr> <mask> + no shutdown)
• Use loopbacks to represent LAN gateways without revealing answers via pre-addressed hosts
• Verify interface state and directly connected reachability with show and ping

Troubleshooting focus

• Detect and correct mask mismatch on both ends of the WAN /30
• Identify when an address falls outside its intended subnet boundary
• Resolve duplicate or overlapping subnet assignments
• Recognize that end-to-end pings across subnets fail by design (no routing configured)