User reports they can't reach 8.8.8.8 from their PC — walk through troubleshooting.

Layer-by-layer: (1) Layer 1: ping default gateway — if fails, check cable/link status. (2) Layer 2: arp -a to verify MAC of default gateway is learned. (3) Layer 3: ping default gateway works; ping 8.8.8.8 fails. Check routing table on PC + on default gateway. Trace route to 8.8.8.8. (4) DNS: nslookup google.com — if DNS fails but ping 8.8.8.8 works, DNS server issue. (5) Firewall: check ACLs / firewall rules at perimeter. (6) NAT: check NAT translation table (if private IP). Each layer eliminates a class of issues.

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User reports they can't reach 8.8.8.8 from their PC — walk through troubleshooting.

How Networkers Home prepares students for this kind of question

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