A+ Network Connectivity Troubleshooting Diagnosis

1. When troubleshooting, you find the gateway is unreachable. What should you check first?

DNS server configuration

Local network connectivity and default gateway IP

ISP status

Firewall rules on remote systems

2. True or False: The ping command can successfully test connectivity even if the destination host has a firewall blocking ICMP.

True

False

3. True or False: HTTPS uses port 443 and encrypts data between client and server.

True

False

4. True or False: A device with an APIPA address can communicate with devices on other subnets.

True

False

Submit

9. What does the netstat command help identify?

Active network connections and listening ports

Physical hardware specifications

Wireless signal strength

BIOS settings

10. Which protocol operates at Layer 4 and ensures reliable, ordered data delivery?

UDP

IP

TCP

ICMP

11. Which OSI model layer is responsible for logical addressing and routing decisions?

Layer 2 (Data Link)

Layer 3 (Network)

Layer 4 (Transport)

Layer 5 (Session)

12. What is the default port number for HTTP traffic?

21

25

80

443

13. Which of the following indicates a physical layer connectivity problem?

DNS resolution failures

No link lights on the network interface card

Unable to reach remote networks

Slow file transfer speeds

14. What is the purpose of the nslookup command?

Test physical cable connections

Query DNS servers to resolve domain names

Display routing table information

Monitor network packet traffic

15. A device receives an IP address of 192.168.1.100 with subnet mask 255.255.255.0. Which address is the network address?

192.168.1.0

192.168.1.100

192.168.1.255

192.168.0.0

16. What does APIPA provide when a DHCP server is unavailable?

Manual static IP assignment

Automatic private IP address in the 169.254.x.x range

Connection to the default gateway

DNS resolution services

17. Which command traces the path a packet takes from source to destination?

Ping

Ipconfig

Tracert (Windows) or traceroute (Linux)

Nslookup

18. What is the primary function of the ping utility in network troubleshooting?

Resolve domain names to IP addresses

Test connectivity between two hosts using ICMP packets

Display the route packets take to a destination

Monitor bandwidth usage in real time

19. A user cannot access the company intranet but can browse the internet. Which component is most likely the problem?

Network interface card

Default gateway configuration

DNS server settings

DHCP server

20. What does the ipconfig /all command display on Windows systems?

All running network processes

Complete network adapter configuration including MAC and IP addresses

List of all connected devices on the network

Firewall status and active ports

A+ Diagnosing Network Connectivity Problems Quiz

1. When troubleshooting, you find the gateway is unreachable. What should you check first?

2.

What first name or nickname would you like us to use?

2. True or False: The ping command can successfully test connectivity even if the destination host has a firewall blocking ICMP.

3. True or False: HTTPS uses port 443 and encrypts data between client and server.

4. True or False: A device with an APIPA address can communicate with devices on other subnets.

5. The ____ gateway is the router interface through which a computer sends traffic to other networks.

6. An Ethernet cable with a damaged outer jacket may cause ____ connectivity issues.

7. The ____ command displays the MAC address of network adapters on a Windows system.

8. A computer has two IP addresses assigned to the same network interface. This is an example of ____.

9. What does the netstat command help identify?

10. Which protocol operates at Layer 4 and ensures reliable, ordered data delivery?

11. Which OSI model layer is responsible for logical addressing and routing decisions?

12. What is the default port number for HTTP traffic?

13. Which of the following indicates a physical layer connectivity problem?

14. What is the purpose of the nslookup command?

15. A device receives an IP address of 192.168.1.100 with subnet mask 255.255.255.0. Which address is the network address?

16. What does APIPA provide when a DHCP server is unavailable?

17. Which command traces the path a packet takes from source to destination?

18. What is the primary function of the ping utility in network troubleshooting?

19. A user cannot access the company intranet but can browse the internet. Which component is most likely the problem?

20. What does the ipconfig /all command display on Windows systems?