CentOS7 Execution ifconfig Command not found no commands found

CentOS7 just released, I couldn't help upgrading the Dell T410 from CentOS6 to CentOS7. Finally, when the installation is complete, configure the network immediately, then install the environment on the Yum source. But the system prompts me to be silly when performing ifconfig:
[Root@chaoge ~]# Ifconfig
-bash:ifconfig: Command not found
This is a newly installed system, how can not find familiar ifconfig command? Online search, a lot of people are said to be environmental variables, but I am sure my/etc/profile set is right, so finally found an article that is installed under the Net-tools good

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[Root@chaoge ~]# Yum Install Net-tools

Loaded plugins: Fastestmirror

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Repository base is listed more than once in the configuration Repository updates is listed more than once in the configuration Repository Extras is listed more than once in the configuration Repository Centosplus is listed more than once in the configuration Repository contrib is listed more than once in the configuration base                                                                                                                                                                                                     | 3.6 kb  00:00:00     extras                                                                                                                                                                                                   | 3.3 kb  00:00:00     updates                                                                                                                                                                                                 | 3.4 kb  00:00:00     updates/7/x86_64/primary_db                                                                                                                                                                             | 2.8 mb  00:00:08     Determining fastest Mirrors

Package net-tools-2.0-0.17.20131004git.el7.x86_64 has been installed and is the latest version
No processing required
Because I have installed net-tools so prompt I have installed, now the familiar ifconfig is back again

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[Root@chaoge ~]# Ifconfig Em2:flags=4099<up,broadcast,multicast> MTU 1500 Ether 78:2b:cb:41:9a:03 Txqueuelen 1000 (Ethernet) RX Packets 0 Bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX Packets 0 Bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 eth0:flags=4163<up,broadcast,running,multicast>  MTU 1500          inet 192.168.1.48  netmask 255.255.255.0  broadcast 192.168.1.255          inet6 fe80::7a2b:cbff:fe41:9a02  prefixlen 64  scopeid 0x20<link>          ether 78:2b:cb:41:9a:02  txqueuelen 1000  (Ethernet)          Rx Packets 82668  bytes 7831470 (7.4 MiB)         Rx Errors 0  dropped 153388  overruns 0  frame 0         TX packets 12 76  bytes 204913 (200.1 KiB)         TX errors 0  dropped 0 overruns 0&NB Sp Carrier 0  Collisions 0 lo:flags=73<up,loopback,running>  MTU 65536         inet 127.0.0.1  netmask 255.0.0.0         inet6::1  prefixlen 128  ScopeID 0x10         loop  txqueuelen 0  (local loopback         RX packets 12  Bytes 1071 (1.0 KiB)     & nbsp;   RX Errors 0  dropped 0  overruns frame 0 0  nbsp TX packets 12  Bytes 1071 (1.0 KiB)         TX errors 0  dropped 0 overru NS 0  carrier 0  collisions 0