Protocol

1573
What Is a Protocol
What Is a Protocol

Now that we've got a bit of a feel for what the Internet is, let's think about another important buzzword in computer networking: protocol. What is a protocol? What does a protocol do?

Tags computer networking, protocol, communicating entities
2135
Cable
Cable

Many residences in the North America and elsewhere receive hundreds of broadcast television channels over coaxial cable networks. (We will discuss coaxial cable later in this section.) In a traditional cable television system, a cable head end broadcasts television channels through a

Tags distribution network, dsl, protocol
1230
Wide-Area Wireless Access
Wide-Area Wireless Access

When you access the Internet through wireless LAN technology, you normally require to be within a few tens of meters of the access point. This is reasonable for home access, coffee shop access and more commonly, access within and around a building. But what if you are on the

Tags lan, cellular network, protocol
1498
Networks Under Attack
Networks Under Attack

The Internet has become mission critical for many institutions today, including large and small companies, universities, and government agencies. Many individuals also depend on the Internet for many of their professional, social, and personal activities. But behind all this utility

Tags network security, computer networking, protocol
1205
Proprietary Networks and Internetworking: 1972-1980
Proprietary Networks and Internetworking: 1972-1980

The early ARPAnet was a single, closed network. ln order to communicate with an ARPAnet host, one had to be really connected to another ARPAnet IMP. ln the early to mid-1970s additional stand-alone packet-switching networks besides ARPAnet came into being:

Tags packet switching, network, protocol
1639
Case Study: P2P Internet Telephony with Skype
Case Study: P2P Internet Telephony with Skype

Skype is an immensely popular P2P application, often with seven or eight million users connected to it at any one time. Besides providing PC-to-PC Internet telephony service, Skype offers PC-to-phone telephony service, phone-to-PC telephony service, and PC-to-PC video

Tags nodes, relays, router, peers, packets, p2p application, protocol
4367
Building a Reliable Data Transfer Protocol
Building a Reliable Data Transfer Protocol

We first examine the simplest case, in which the underlying channel is completely reliable. The protocol itself, which we'll call rdt1.0, is trivial. The finite-state machine (FSM) definitions for the rdt1.0 sender and receiver are shown in Figure 1. The FSM in Figure 1(a) defines the

Tags protocol, fsm, arq, data packet, countdown timer, checksums, data transfer, transport layer
4240
Pipelined Reliable Data Transfer Protocols
Pipelined Reliable Data Transfer Protocols

Protocol rdt3.0 is a functionally correct protocol, but it is doubtful that anyone would be happy with its performance, especially in todays high-speed networks. At the heart of rdt.3.0s performance problem is the fact that it is a stop-and-wait protocol.

Tags protocol, propagation delay, end systems, routers, data packet
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