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aria2c, curl, wget: Download tools;
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ping: ping -c 4 bing.com;
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tracepath bing.com;
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mtr bing.com: combination of ping and tracepath;
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host bing.com; host 204.79.197.200
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whois bing.com
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ifconfig;
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ifup; ifdown;
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ifplugstatus: sudo apt-get install ifplugd
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netstat -p; netstat -s;
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dhclient (root privilege): free IP address, and get a new one from DHCP server;
Ref: 如何用Linux命令行管理网络：11个你必须知道的命令