What two reasons is Wireshark used for?

Related questions

1. What is Wireshark and how it works?
2. Can Wireshark sniff wireless?
3. Are IP sniffers illegal?
4. What is the benefit of using a tool like Wireshark?
5. Is WiFi sniffing illegal?
6. What is packet sniffing in networking?
7. Is it safe to install Wireshark?
8. What are the applications of Wireshark?
9. What is WiFi sniffing?
10. What country is the Sniffer from?

Tags

1. #people
2. #troubleshoot
3. #network
4. #administrators
5. #applications
6. #verify
7. #reasons
8. #wireshark
9. #engineers
10. #examine
11. #problems
12. #security