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Shows how IP addresses are being used when computers are transmitting messages. Each /npacket is tagged by sender and receiver's IP addresses.

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Why ip address ip address picture book 1 www visualland net l.jpg

Why IP addressIP Address Picture Book 1www.visualland.net

Watch animation to learn networking.

Shows how IP addresses are being used when computers are transmitting messages. Each packet is tagged by sender and receiver's IP addresses.

This picture tutorial takes screenshots fromIP Address Animation.

OK to republish this slide. Please use hyperlink to point to its source.

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Ip address animations l.jpg
IP Address animations

Why IP address? Visualize how IP addresses are being used when Internet forwards messages between computers.

2. How Internet Forwards Packets? Computers are connected to Internet via gateway routers. Routers use routing table to make packet forwarding decisions.

3. Network Address. A 32-bit IP address is divided into network ID (left bits) and host ID (right bits). Router uses network addresses to forwad packets.

4. Classful IP Address. Present IP addresses in A, B, C, D classes by byte boundary with a.4-digit form (a.b.c.d) and show how routing table does lookup.

5. Subnettiing - Classless IP address It uses a class B address and its 5 subnets as an examples to show how routing table lookup works with different network mask.

6. VLSM Show a good subnetting design case that aggregatrd routes in a routing table. Ans show a bad case that cannot aggregate routes.

2014/3/10

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Overview: Why IP address? Animation Link

Goal: Use Ping to show how computers are using IP addresses to send and receive messages across Internet.

Topology: 3 computrers are connected to Internet. Each is assigned an individual IP address.

Steps: 1) Jack ping Rose. It transmits a Ping packet with "Receiver address" to be Rose's IP address,

2) Internet forwards Ping to Rose.

3) Rose receives Ping and sends an Echo back to Jack. Internet forward Echo to Jack.

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Topology、IP Addresses

In this case study, we present a simplied Internet. Three computers Jack. Rose, and Mary are connected to

Internet, Their IP addresses are100.4.5.6, 150.1.2.3, and 222.111.44.33. This topology will be reused in the

following IP Address simulations.

Note: See FAQ for more information on IP addresses usage and structure.

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JackPingRose

Jack wants to know whether Rose is online. He ping Rose. A Ping packet is transmitted from Jack's computer. This packet carries two addresses like a postal mail. Receiver address is Roses' IP address 150.1.2.3. Sender address is Jack's IP address 100.4.5.6. Jack has no idea where Rose is located. He is counting on Internet to delver it to Rose.

Click Ping to see its addresses.

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Internetforwards ping

When Internet receives Ping packet, it sees the receiver's address is 150.1.2.3 and forwards Ping to Rose.

We can look at the Internet as a big communication black box. You pass a message to it with a receiver's IP address and Internet will deliver it for you. The only thing Internet needs is the correct receiver IP address.

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Rosesends an Echoto Jack

When Internet receives Ping packet, it sees the receiver's address is 150.1.2.3 and forwards Ping to Rose.

We can look at the Internet as a big communication black box. You pass a message to it with a receiver's IP address and Internet will deliver it for you. The only thing Internet needs is the correct receiver IP address.

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Rosesends an Echoto Jack

When Internet receives Ping packet, it sees the receiver's address is 150.1.2.3 and forwards Ping to Rose.

We can look at the Internet as a big communication black box. You pass a message to it with a receiver's IP address and Internet will deliver it for you. The only thing Internet needs is the correct receiver IP address.

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Rosesends an Echoto Jack

When Internet receives Ping packet, it sees the receiver's address is 150.1.2.3 and forwards Ping to Rose.

We can look at the Internet as a big communication black box. You pass a message to it with a receiver's IP address and Internet will deliver it for you. The only thing Internet needs is the correct receiver IP address.

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FAQ

  • Why do we need IP address?

  • What is the structure of IP address?

  • How many IP addresses are there?

  • What is Internet?

  • How does Internet deliver computer messages?

    ( answers in the Comments box )

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What is vlab visualland net l.jpg
What is Vlabvisualland.net

  • VLAB: Virtual Lab

    • Theory: Visualize key points of network protocols to help beginners grasp the basic ideas quickly.

    • Lab: Visualize network activities with packets and router states captured from network simulators (dynamips, packet tracer, and ns2.

    • Interactively control animation: packet headers, protocol state tables.

  • Vlab usage

    • Self learning, teaching aids, lab book.

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