ITM 301 Chapter Notes - Chapter 2: Domain Name System, Ip Address, Reverse Dns Lookup

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Chapter 2 how computers find each other on networks. Four addressing methods: application layer fqdns, computer names, and host names, transport layer port numbers, network layer ip address. Ipv6 addresses have 128 bits and are written as eight blocks of hexadecimal numbers: data link layer mac address. Traditional mac addresses contain two parts: first 24 bits are known as the oui (organizationally unique identifier) or block id or company-id. Last 24 bits make up the extension identifier or device id: ma(cid:374)ufa(cid:272)tu(cid:396)e(cid:396)"s assig(cid:374) ea(cid:272)h nic a u(cid:374)i(cid:395)ue de(cid:448)i(cid:272)e id. Character-based names are easier to remember than numeric ip addresses. Domain names must be registered with an internet naming authority that works on behalf of. Last part of an fqdn is called the top-level domain (tld) Icann restricts what type of hosts can be associated with . arpa, . mil, . int, . edu, and . gov. Name resolution is the process of discovering the ip address of a host when you know the fqdn.

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