For this routing to work properly the default gateway

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because it has a default gateway address configured, it sends it to the router up here, which then forwards it the appropriate network. For this routing to work properly, the default gateway needs to be configured with the same subnet address as the network hosts. If the default gateway is on a different subnet, the hosts won't be able to communicate with it. On most networks, the router or default gateway is the network's connecting point to the internet.For example, connections to websites are handled by the default gateway and this actually brings up another configuration parameter you should be aware of, which is the DNS server address.
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DNS Server Address 5:15-6:48 When we need to visit a particular website, we type in that website's URL and we're taken to the website, but there's actually an underlying process that occurs when that happens. See, computer networks don't actually use website names. They use IP addresses, but for us, it's much easier to remember google.com instead of 172.217.0.78. So to make our lives easier, computers use a technique known as name resolution. With name resolution, computer create an association between an IP address and a host name such as google.com. Name resolution is handled by the DNS server, which keeps an up to date list of IP address and host name associations. In order for a host to communicate with the DNS server, it needs the DNS server address to be set in its IP configuration. With this set, hosts on the network will be able to contact the DNS server and obtain the IP address association when host names are used. There are a few different types of DNS implementations. Internal DNS servers reside inside a networkand are used to provide name resolution for internal hosts and other services. External DNS servers are servers located on the internet and are used to obtain name resolution for websites and then there's client-side DNS, which are settings configured on a single host. See, when you type in a URL, your computer first looks for any local DNS settings, which are located in a host's file on the computer. If no name resolution exists, the computer then contacts the DNS server specified in the IP configuration settings. Summary 6:49-7:08 That's it for this lesson. In this lesson, we looked at the various IP configuration settings that are required in order for both internal and external network communication to occur. We looked at the IP address. We looked at how the subnet mask is used to identify the subnet address and host addressand we finished by looking at the role of the default gateway address and DNS server address. TCP/IP Configuration Methods 0:00-0:22 Hosts on a TCP/IP network need to be configured with various parameters before network communication can occur. The host needs to be configured with an available IP address, the network subnet mask, the default gateway and the DNS server address.
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  • Spring '14
  • Computer network, Local area network, Network topology, Metropolitan area network

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