The domain naming system DNS is a cornerstone of every network infrastructure. Thus, when you go to a web-page like www. Thus, if DNS is not working "nothing is working" for the end users. When you perform a ping, you can easily see that the domain name is resolved to an IP shown in Figure 2. Ethernet is the protocol for your local area network LAN.
You have Ethernet network interface cards NIC connected to Ethernet cables, running to Ethernet switches which connect everything together. Without a "link light" on the NIC and the switch, nothing is going to work. MAC addresses or Physical addresses are unique strings that identify Ethernet devices. Every computer on a network must have a unique Layer 3 address called an IP address. IP addresses are 4 numbers separated by 3 periods like 1. 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.
I am not going to go into how to do it and you do not need to know how to do it from memory either unless you are sitting for a certification exam because you can use an IP subnet calculator, downloaded from the Internet, for free. The default gateway, shown in Figure 3 as That default gateway is your local router. A default gateway address is not required but if it is not present you would not be able to talk to computers outside your network unless you are using a proxy server.
Figure 3: Network Connection Details. The private IP addresses always start with Protecting your network from malicious attackers are firewalls. You have software firewalls on your Windows PC or server and you have hardware firewalls inside your router or dedicated appliances.
You can think of firewalls as traffic cops that only allow certain types of traffic in that should be in. For more information on Firewalls, checkout our Firewall articles. Your local area network LAN is usually contained within your building. It may or may not be just one IP subnet. So, remember, your LAN is "local". The Internet is a humongous global WAN. However, most large companies have their own private WAN. WANs span multiple cities, states, countries, and continents.
WANs are connected by routers. Routers route traffic between different IP subnets. Router work at Layer 3 of the OSI model. On small home networks, you can have an integrated router that also offers firewall, multi-port switch, and wireless access point. Switches switch frames based on the destination MAC address for that frame. One of the core networking concepts is the OSI Model. Book Description: Windows Server is the server operating system developed by Microsoft as part of the Windows NT family of operating systems, developed concurrently with Windows OpenStack Trove Essentials.
Pro MongoDB Development. Essentials of Computer Architecture, 2nd Edition. Handbook of Big Data Technologies. Please enter your comment! Please enter your name here. You have entered an incorrect email address! Follow Us! Latest Books. Articulate Storyline Essentials 18 June Beginning SharePoint Development 18 June Beginning SharePoint 18 June Popular Categories. Programmer-books is a great source of knowledge for software developers.
Here we share with you the best software development books to read. Best 3 Python books For Programmers [] 25 September
0コメント