Scenario

You are provisioning endpoints for two office network designs. Level 1 uses the Sales and HR /26 networks shown in the work order; Level 2 allocates 192.168.20.0/24 to OPS (100 hosts), Sales (50), IT (25), and EXEC (10), largest first with no gaps. The router uses the first usable address in each subnet. Keep addresses unique within each level.

Your tasks

1. Select Level 1 or Level 2 and inspect the work order and topology.
2. Click an endpoint. Enter its IPv4 address, select a subnet mask/CIDR, and enter its default gateway. Apply the configuration, then continue to the next device.
3. Select Level 3 and enter the VLSM network, mask, prefix, usable range, and broadcast for each department.
4. Use Validate in the header to grade the current level.

Rules

Validate checks every endpoint for its assigned subnet, matching mask and gateway, and duplicate addresses. The worksheet checks all 24 fields. Complete all three levels to finish; attempts are unlimited. Saved configurations and worksheet entries remain when you switch levels or modes. Router and switch panels are read-only infrastructure.

What this mission tested

IPv4 host configuration, subnet boundaries, VLSM allocation, and duplicate detection.

Exam objectives

Network+ N10-009: 1.7 IPv4 addressing, subnetting, CIDR and VLSM; supporting 5.3 network-service troubleshooting.

Walkthrough

Level 1 Sales: 192.168.10.0/26, usable .1–.62, broadcast .63; HR: 192.168.10.64/26, usable .65–.126, broadcast .127. Both use 255.255.255.192.

Level 2 and the worksheet use 192.168.20.0/24: OPS .0/25 (mask 255.255.255.128, usable .1–.126, broadcast .127); Sales .128/26 (mask 255.255.255.192, usable .129–.190, broadcast .191); IT .192/27 (mask 255.255.255.224, usable .193–.222, broadcast .223); EXEC .224/28 (mask 255.255.255.240, usable .225–.238, broadcast .239). Each gateway is the first usable address. Configure unique usable endpoint addresses with the matching mask and gateway.

Key takeaways

Block sizes for /25, /26, /27, /28 are 128, 64, 32, 16. Apply saves settings; Validate grades. GUI and terminal use the same settings.

Common mistakes

• Using network or broadcast addresses as hosts.
• Selecting a mask or gateway from a different subnet.
• Duplicating endpoint addresses.
• Overlapping VLSM allocations or leaving gaps.