Learn by making a decision

Practice Games

Match a component or build a packet’s journey. Each solo challenge explains your decision, supports retries, and tracks first attempts separately from completion.

What should I practice next?

Topic mission: Next-hop troubleshooting

Practice a diagnostic test, interpret the next hop, and verify a repair. Completion and independent application are tracked separately.

Network+ N10-009 · Routing/addressing/troubleshooting · Solo · 3 objectives. First focused mission; recommendations cover this topic only.

Start next-hop mission Review next-hop notes

Subnet Architect

Network+ N10-009 · Objective 1.7 · IPv4 subnetting and VLSM · Foundation → Applied · Solo

Verified Subnet Detective exercises connect to largest-first VLSM designs, usable interfaces, constraint checks and new transfer challenges. Guided Practice and independent Challenge.

Play Subnet Architect

CertificationTopicDifficulty

A+ Core 1 · 220-1201 · Solo

CompTIA A+ Computer Component Match

Identify components, check compatibility and connect symptoms to useful checks.

Computer hardware · Foundation · 8 objectives

Learning objectives

Distinguish temporary working memory from persistent storage.
Identify the PSU’s AC-to-DC function.
Distinguish solid-state storage from mechanical storage and RAM.
Use memory generation and form factor to check compatibility.
Match an expansion card to the supported slot and stated power constraints.
Connect disk-related symptoms to a storage investigation without overdiagnosing.
Use diagnostic evidence to prioritize a RAM/installation check.
Identify the NIC’s network-connectivity role.

Play Component Match

Network+ · N10-009 · Solo

IP Routing: Follow the Packet

Build a justified packet journey: local delivery, routed delivery, then a different network.

IPv4 routing · Foundation → Applied · 16 objectives

Learning objectives

Use the mask to decide local versus remote.
Choose the correct ARP target with an empty cache.
Distinguish local MAC endpoints from IP endpoints.
Explain switching without decrementing IP TTL.
Explain frame removal and local IP delivery.
Use subnet comparison to choose a gateway.
Resolve a local next-hop MAC for a remote IP destination.
Construct a frame to the gateway while retaining IP endpoints.
Apply longest-prefix match rather than first/default route.
Explain router TTL reduction without NAT endpoint changes.
Use the selected exit network for address resolution.
Explain which link-layer addresses change after routing.
Recognize destination delivery and end-to-end IP addresses.
Apply a different subnet and a populated ARP cache.
Apply longest-prefix match with /26 versus /24 and default.
Predict TTL and both address layers on a different network.

Play Follow the Packet

Outage Ops

Cooperative troubleshooting with Guided Demo and existing Twilio rooms. Investigate evidence, diagnose the incident, repair and verify.

A+ / Network+ · Troubleshooting · Applied

Open Outage Ops