You can also see that I received it via DHCP where it says DHCP Enabled YES. You can see my computer's IP address in Figure 1 where it says IPv4 Address 10.0.1.107. Of course, to receive that information, your computer must first have network connectivity (a link light on the NIC and switch) and must be configured for DHCP. Most computers receive their IP address, subnet mask, default gateway, and DNS servers from a DHCP server.
IP addresses are 4 numbers separated by 3 periods like 1.1.1.1. IP Addressing and SubnettingĮvery computer on a network must have a unique Layer 3 address called an IP address.
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Your computer will then perform an ARP request on the network to find out what computer (identified by their Ethernet MAC address, shown in Figure 1 as the Physical address) has that IP address. When you go to open a web page and get a successful DNS lookup, you know the IP address. ARP (address resolution protocol) is the protocol that maps Ethernet MAC addresses to IP addresses. MAC addresses (or Physical addresses) are unique strings that identify Ethernet devices. Without a "link light" on the NIC and the switch, nothing is going to work. You have Ethernet network interface cards (NIC) connected to Ethernet cables, running to Ethernet switches which connect everything together. Ethernet & ARPĮthernet is the protocol for your local area network (LAN). When you perform a ping, you can easily see that the domain name is resolved to an IP (shown in Figure 2).įigure 2: DNS name resolved to an IP addressįor more information on DNS servers, see Brian Posey's article on DNS Servers. So, you should know what DNS is, how important it is, and how DNS servers must be configured and/or DNS servers must be working for "almost anything" to work. If you do an IPCONFIG /ALL in windows, you will see your PC's DNS server IP addresses.įigure 1: DNS Servers shown in IPCONFIG output Thus, if DNS is not working "nothing is working" for the end users.ĭNS server IP addresses are either manually configured or received via DHCP. Thus, when you go to a web-page like without DNS, that name would not be resolved to an IP address and you would not see the web page.
DNS maps IP addresses to names and names to IP addresses (forward and reverse respectively). The domain naming system (DNS) is a cornerstone of every network infrastructure.
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So, here is my list of 10 core networking concepts that every Windows Network Admin (or those interviewing for a job as one) must know: 1. I thought that this article might be helpful for Windows Network Admins out there who need some "brush-up tips" as well as those who are interviewing for network admins jobs to come up with a list of 10 networking concepts that every network admin should know. She was asked a number of technical questions in the interview but the ones that she struggles with the most were the networking questions (as she had not used or studies networking in some time). Recently a relative of mine went for a job interview as a security analyst.
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