You will need to keep a running log of IP addresses, which are four-digit numbers used to identify each Internet-connected computer in your office. Network administrators also need to know and understand the function of MAC addresses, which are identifiers assigned to Ethernet cards and devices.
You’ll use DNS lookups when troubleshooting problems, setting up user email, limiting incoming spam and authenticating incoming communication. Firewalls keep intruders and malicious software from accessing a system when used correctly. Network administrators should also understand how to diagnose firewall-related errors and how to make essential changes to software settings if a firewall is preventing a company’s employees from handling their day-to-day business. Ideally, network administrators should understand the basic features and commands of Linux, UNIX, Windows and Mac OS servers. With the growing popularity of cloud-based virtual servers from companies like Amazon and Microsoft, network administrators’ job descriptions are changing significantly. It is the soft skills that will delineate between a good Network Admin and a Great Network Admin.
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According to the BLS, the median income for network administrators was $69,160 per year in 2010. You’ll use IP addresses when diagnosing problems, particularly conflicts in which two or more devices attempt to claim the same IP.
No matter how complex network tools get, administrators will always need to know how to look up DNS information and interpret it accurately. Unfortunately, some network administrators do not know how to effectively manage the settings of these programs to stay protected.
Versatile administrators will have a much easier time running complex systems that incorporate multiple operating systems. Virtual servers are just that—virtual—and businesses that use them don’t need large physical servers for their websites or payment systems. Bureau of Labor Statistics (BLS) expects a 28 percent growth in job opportunities for network administrators by 2020, which is faster than average for all jobs in the United States.
However, the jobs and the salaries go to administrators who can master their concepts and effectively manage large systems. A huge part of a network administrator’s job is knowing and using these identifying numbers to diagnose and fix problems or to add new computers and servers to existing networks. A DNS lookup can give you some of the identifiers listed above, so it’s one of your best tools.

Remember that LAN is local.Modern networks use private IP addresses, which are translated to public IPs via network address translation (NAT). With that being said, it’s great career for tech-minded people who enjoy building, organizing and fixing big networks. If you’re interested in a job as a network administrator, you need to know your stuff. Network administrators often avoid it by using a technique called IP subnetting, in which groups of IP addresses are essentially banded together under one parent address. Capable network administrators fully understand all three of these concepts and can use them to organize effective large-scale networks. It’s also a high-paying job with a constantly changing set of responsibilities, and for the tech-minded, there are few careers as challenging and rewarding.

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