These ten questions cover the whole course. Answer each one and read the explanation. If you get a question wrong, go back to the lesson it came from.
1. A user calls to say 'the network is down'. What is your first step?
2. Only one web application fails; email and other websites work. Which approach fits best?
3. Windows ping says 'Reply from 192.168.10.25: Destination host unreachable', and 192.168.10.25 is your own PC. What does that mean?
4. In a traceroute, hop 3 shows * * * but hops 4 to 7 reply normally. What is wrong at hop 3?
5. Which IP address tells you a Windows PC failed to get an address from DHCP?
6. show ip interface brief shows an interface as 'down / down'. Where do you look first?
7. A user complains of a slow connection, and the switch port's late-collision counter keeps increasing. What is the most likely cause?
8. A PC reaches everything in its own subnet but nothing beyond it. What is the most likely fault?
9. R1 has a route to a remote network, but pings from the PC time out. R2, on the far side, has no route back to the PC's network. What happens?
10. ping 203.0.113.80 works but ping www.example.com fails with 'could not find host'. What is the fault?