Network Troubleshooting (Network+) Quiz for College

1. Which command resolves a hostname to its IP address on a network?

Nslookup or dig

Arp -a

Ipconfig /all

Netstat -an

2. A device shows connectivity to the local network but cannot reach external networks. Which layer is most likely affected?

Layer 1 (Physical)

Layer 2 (Data Link)

Layer 3 (Network)

Layer 4 (Transport)

3. When troubleshooting a network, checking from the simplest to most complex issue is known as which approach?

Escalation method

Bottom-up troubleshooting

Top-down troubleshooting

Systematic elimination

4. A Cat6 cable is installed in a network. Which maximum transmission distance applies to this cable type?

55 meters

100 meters

185 meters

300 meters

5. What does netstat -an display in network troubleshooting?

Active connections and listening ports

Routing table entries

DNS cache contents

MAC address table

6. A technician receives 'destination unreachable' messages when pinging a remote host. What is a likely cause?

The host is offline or blocking ICMP

The local network cable is unplugged

DNS is not configured

DHCP lease expired

7. Which protocol is used to assign IP addresses dynamically to network devices?

DNS

DHCP

ARP

SNMP

8. A computer shows 'No Internet' but other devices on the same network work fine. What should you check first?

ISP billing status

Device's IP configuration and gateway

Router firmware version

DNS server settings globally

9. What does ARP primarily do in network communication?

Maps IP addresses to MAC addresses

Converts domain names to IP addresses

Routes packets between networks

Establishes TCP connections

10. A user reports intermittent packet loss on a wired connection. Which is the best first diagnostic step?

Replace the network cable

Check for cable damage and connection integrity

Update network drivers

Reconfigure the router

11. Which OSI layer is primarily responsible for routing data between networks?

Layer 2 (Data Link)

Layer 3 (Network)

Layer 4 (Transport)

Layer 5 (Session)

12. A network switch port shows a solid orange LED. What does this typically indicate?

Port is disabled

Port is actively forwarding data

Port is in blocking or learning state

Port has an error condition

13. What is the primary purpose of the tracert command in network troubleshooting?

Identify each hop and latency to destination

Test DNS resolution

Verify MAC address resolution

Measure bandwidth utilization

14. A workstation has an APIPA address (169.254.x.x). What does this indicate?

DHCP server is functioning normally

Static IP was manually assigned

DHCP lease could not be obtained

Network interface is disabled

15. Which tool is used to map the network path taken by packets to a destination?

Nslookup

Tracert (or traceroute)

Arp -a

Netstat -an

16. A ping to the default gateway succeeds, but pings to external hosts fail. What is the likely issue?

Local network interface failure

Routing or ISP connectivity problem

DHCP server misconfiguration

Physical cable disconnection

17. What does a cable tester using TDR (Time Domain Reflectometry) primarily measure?

Cable impedance and length

Signal attenuation only

Crosstalk levels

EMI interference

18. Which command displays the current routing table on a Windows system?

Ipconfig /route

Route print

Netstat -r

Tracert default

19. A user cannot access the internet. The first step in troubleshooting should be to check which element?

Router configuration

Physical network connectivity

ISP status

Firewall rules

20. What does ICMP primarily test in network troubleshooting?

Physical cable integrity

Host reachability and round-trip time

DNS resolution speed

Firewall rule compliance

Network+ Troubleshooting Quiz: Can You Find the Fault?