Internet - will be one packet and N networks between the...

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Basic Networks Concepts May-2011 Ayman Boghdady Page 1
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Internets Single LANs Versus Internets In single networks (LANs and WANs), all devices connect to one another by switches—our focus so far. In contrast, an internet is a group of networks connected by routers so that any application on any host on any single network can communicate with any application on any other host on any other network in the internet. Internet Components All computers in an internet are called hosts Clients as well as servers Networks are connected by devices called routers Switches provide connections within networks, while routers provide connections between networks in an internet. Frames and Packets In single networks, message are called frames In internets, messages are called packets Ayman Boghdady Page 2
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Packets are carried within frames In each network, the packet is carried in (encapsulated in) a frame If there are N networks between the source and destination hosts, there
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Unformatted text preview: will be one packet and N networks between the source and destination hosts, there will be one packet and N frames for a transmission Subnets in Internet IP Address Management Every Host Must Have a Unique IP address Server hosts are given static IP addresses (unchanging) Ayman Boghdady Page 3 Clients get dynamic (temporary) IP addresses that may be different each time they use an internet Dynamic Host Configuration Protocol (DHCP) Clients get these dynamic IP addresses from Dynamic Host Configuration Protocol (DHCP) servers Domain Name System (DNS) IP addresses are official addresses on the Internet and other internets Hosts can also have host names (e.g., cnn.com) If you only know the host name of a host that you want to reach, your computer must learn its IP address DNS servers tell our computer the IP address of a target host whose name you know. Ayman Boghdady Page 4...
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Internet - will be one packet and N networks between the...

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