![]() Forwards packets from one connection to the other It needs at lest 2 connections to forward anything Router has multiple network connections.The router provides the internet service, handling the computer's packets.A computer typically connects to a router for service.TCP/IP blooper in this video of "The Net".īlooper: in the video the IP address is shown asħ5.748.86.91 - not a valid IP address! Each number should be 1 byte, 0.255 More specifically, in my part of the Gates building, all the IP addresses begin 171.64.64.XX varying only in that last byte. The left part of the address encodes in part where that IP address is in the whole internet - for example any 171.64.(anything) is part of Stanford (like the area code of a phone number). The IP address is 4 bytes, written between dots, like "171.64.2.3". Cannot just make up an IP addr, depends on locationĮvery computer on the internet has an "IP address" that identifies it (like a phone number).Left part encodes "neighborhood" on internet.IP addr is exactly 4 bytes (4 1-byte numbers).Here looking at IP v4 addresses, v6 addrs some day in the future.Every computer on the internet has an IP address.Wifi sends the 0/1 data on a radio channel.In reality, there is more complex scheme than 3-volts/0-volts.Modern ethernet is runs at at least 100 million bits per second.Signal goes down the wire at around 2/3 the speed of light (varies).digital transmission - just 0's and 1's.Assemble the 0's and 1's in groups of 8 to make each byte Follow along the pattern of 3 volts / 0 volts coming down the wire Go through all the bits, from left to right Send each byte (slight simplification):.1500 bytes * 8 bits-per-byte = 12000 bits total.Look at transmission of one 1500 byte packet.Then image.jpg divides into about 32 packets.Say each packet is 1500 bytes (a common size).This is the "one hop" LAN case (scale up to whole world later).send an image file between ethernet connected computers "Ethernet" is a common wired-network form, use as an example here.Interesting connection with open standards One of the most valuable inventions of recent history.Vendor-proprietary "internet" attempts pre-TCP failed.These are vendor neutral - super successful pattern.TCP/IP Standards, 1974, government sponsored research.Internet is like a phone system for computers.Internet - world-wide network built on open standards.Neat to see how something you use every day works. Now does the Internet work? I pulled these slides together I had laying around from another class.
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