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Extending Intranets to Extranets Intranets are the building blocks of extranets. If part of your intranet is available to people outside your organization, such as customers and suppliers, the part you share with the outside world is an extranet. An extranet has these characteristics: ✓ It consists of multiple, interconnected intranets/internets. ✓ An organization’s extended family of partners work together electronically. ✓ It might not exist physically — it’s a virtual network. Because an intranet is a private network within an organization or a department, you might find a few different intranets in a large institution.

IMPP: Instant Messaging and Presence Protocol Although instant messaging (IM) is a handy application for people to send quick messages back and forth across the Internet, IM vendors have traditionally used different, proprietary protocols that don’t work together. The goal of IMPP is for different IM applications to be able to talk to each other easily across the Internet. SIP: Session Initiation Protocol SIP is a protocol for connecting multimedia sessions — such as voice, chat, games, and video.

One or more packets may get dropped while on their trip from the source to the destination. IP doesn’t care — TCP takes care of it. Figure 2-6 shows how an e-mail message is “packetized,” or sent across the Internet and reassembled. Just like a spoon, TCP ensures that nothing is dropped, no matter what kind of data you’re sending. TCP uses IP to deliver packets reliably to those upperlayer applications. Two of the most important TCP functions are ✓ Error checking: Ensures that every packet arrives undamaged ✓ Sequence numbering: Puts the packets back into the right order.

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