A Protocol for Packet Network Intercommunication

  Blog Post by: Kaitlyn Khan, Hamza Rashid, Tom Reingold, Tong Chen

Packet switching networks have been developed as a way to allow networks to share resources. A method for delivering data is also part of the network. Packet switching networks have of a set of computer resources called HOSTS, a set of one or more packet switches, and communication media that interconnect the packet switches. HOSTS would need to communicate with other HOSTS. Since different HOSTS may use different processes to communicate, a packet switching subnet can show this relationship. There is a maximum size of data which can be transferred through the subnet. Different networks have different strengths and weaknesses depending on communication media data rates, buffering and signaling strategies, routing and propagation delays. (Hamza)

Gateways are connections that join two networks allowing data to travel from one network to another. In practice, a gateway contains two half. Each half is associated with one side of the network. Transfer of data from their associated networks to the next is by changing data to local packet format or by simply extracting them allowing the other half to reencode it in their network's format. The path of data going through gateways is determined by internetwork headers. Which contains information that specifies the source and destination of the packet. The next two information sequence number and byte count allow proper sequencing when the data arrives and detect fault conditions that may affect the data. The last information flag field conveys special control information. (Tong Chen)

 

This paper is perhaps the most seminal to the inception of the Internet. Until the time when it was written, there was no shared vision of interconnecting the world's computers. Computer networks were too diverse and were not able to communicate. Nor had people truly imagined what could be done with computers and networks, which is why the impetus to create an internet (with a lower case 'i') came about so late. It's basically a framework upon which all network protocols are based. And since it is so multi-layered and flexible, it relieves certain companies from solving certain problems, at least for a time. The two co-authors, Vint Cerf and Bob Kahn, have contributed vastly to the network and electrical engineering fields, as described in their respective Wikipedia articles. (Tom Reingold)

 

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