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Routers inside the private network can route traffic

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Routers inside the private network can route traffic between private addresses with no trouble. However, to access resources outside the network, like the Internet, these computers have to have a public address in order for responses to their requests to return to them. This is where NAT comes into play. DHCP and DNS DHCP is a protocol known as Dynamic Host Configuration Protocol. Its main purpose is to assign different IP addresses to devices on a network. Network administrator has to assign IP addresses when a user connects to internet through a machine. By using this protocol network administrator's work become easier because he does not have to assign IP addresses manually as using DHCP this process of assigning IP addresses becomes automated. DNS is also a internet protocol and is known as Domain Name Server or Domain Name Service. Its purpose is to translate domain names into IP addresses. Whenever we use a domain name, then a service is used for translating domain names into IP addresses and is known as DNS. For example, thedomain name www.bigcity.com might translate to 192.103.202.2. So what DNS did in above example as it translates the name "Bigcity" into corresponding IP address . If one DNS server does not know how to translate the particular domain name it asks another DNS server and this process continued until the correct IP address is returned. As in above example, if one domain server does not know how to translate www.bigcity.com then it will move to another DNS until the corresponding IP address 192.103.202.2 is returned. Static IP Addressing If you feel the need to always know what your IP address is then you need a Static IP address, because it is constant. Static IP addresses are more reliable for Voice over Internet Protocol (VOIP), more reliable to host a gaming website or to play X-Box, Play Station, use Virtual Private Network for secure access to files from your company network computer, etc. Static IP addresses are also great if you use your computer as a server, as it should give your file server faster file uploads and downloads. Another plus with Static IP's, when hosting a website you are not sharing your IP with another company who sends out a lot of E-mail SPAM and not only has their website been shut down but in turn gets your IP address blacklisted. In contrast a static IP address can become a security risk, because the address is always the same. Static IP's are easier to track for data mining companies. Static IP addressing is less cost effective than Dynamic IP Addressing. A Family of Protocols TCP/IP is a large collection of different communication protocols based upon the two original protocols TCP and IP. TCP - Transmission Control Protocol TCP is used for transmission of data from an application to the network. TCP is responsible for breaking data down into IP packets before they are sent, and for assembling the packets when they arrive.
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Routers inside the private network can route traffic...

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