1. Linux is: a. O A webserver b. D An OS for routers c. A kind of computer d. An open source implementation of the Unix kernel 2. Using Firefox Web Browser in Ubuntu, you discover that a URL with a domain name does not work, but when you enter the IP address of the website you are seeking, the home page appears. Which command might help you resolve the problem? a. O arp b. O dig c. O nslookup d. pathping 3. You have set up an FTP server on your Ubuntu Server system and suspect network traffic to the server? hacker is trying to gain access to your FTP site. Which command allows you to monitor all a. O nmap b. O dig c. tcpdump d. All of the above