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How to configure a static IP address on CentOS 7 / RHEL 7

I am a new sysadmin and CentOS user. My system is configured to use DHCP. How can I switch from DHCP to static IP address configuration in a CentOS 7 desktop system? How do I setup a static TCP/IP address on my CentOS Linux 7 or Red Hat Enterprise Linux 7 server using command line option?
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How To Look Up DNS on a Linux and Unix Systems

How do I look up for DNS (Domain Name System) information on a Linux or Unix-like systems using command line options?
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Linux / Unix: Find Out DNS Server IP Address / Names

How do I find out my DNS server IP address assiged my my ISP under Unix or Linux operating system using command prompt? How do I find preferred dns server under Debian / Ubuntu / Fedora Linux desktop system?
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HowTo: Find Out DNS Server IP Address Used By My Router?

My router configured by ISP tech and it is set to get DNS server address automatically from upstream. Is there is a way to find out the IP address of the dns server used by my router which is located at 192.168.1.1? Is there Linux, Unix, Apple OS X, or MS-Windows command that I can use get the same information?
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Slow DNS on Linux with IPv4 and IPV6 Configured Firewall

I‘m getting slow DNS response from ssh and other network related traffic with delay of 30-60+ seconds per connection. All of our servers are behind hardware based dedicated firewall. My RHEL v6.1 server system running on HP hardware. How do I fix this problem?
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Linux Static IP Address Configuration

How do I configure the Internet Protocol version 4 (IPv4) properties of a network connection with a static IP address for servers running Linux operating systems? How do I configure static IP address under Debian Linux or Redhat / RHEL / Fedora / Redhat Enterprise Linux server?
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Linux Find Out My IP Number ( IP Address )

How do I find out ip number (IP Address) of my Linux server using command line options?
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OpenBSD: Static Routing Configuration

I know how to setup static routing under Linux and FreeBSD operating systems. But, how do you setup static routing under OpenBSD operating systems?
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I see the following error in my SELinux enabled CentOS or RHEL server:

Jun 21 13:58:43 server3 restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jun 21 16:14:51 server3 restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory
Jun 22 13:32:23 server3 restorecond: Will not restore a file with more than one hard link (/etc/resolv.conf) No such file or directory

How do I fix this problem?
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Redhat Linux Network Interface Configuration (NIC) File Location

Where are NIC (network interface configuration) files located in the Redhat / Fedora / Centos Linux?
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