April 2013 Archive


1691
Computer Networks and the Internet
Computer Networks and the Internet

Today’s Internet is perhaps the largest engineered system ever created by mankind, with hundred of millions of connected computers, communication links, and switches; hundreds of millions of users who connect from time to time via cell phones and PDAs; and devices such

Tags computer network, protocol layering, network application
2293
What Is the Internet
What Is the Internet

In this blog, we'll use the public Internet, a specific computer network. as our principal vehicle for discussing computer networks and their protocols. But what is the Internet? There are a couple of ways to answer this question. First, we can describe the nut and bolts of the

Tags distributed applications, packet switches, transmission rate
1435
A Services Descriptions
A Services Descriptions

Our discussion above has identified many of the pieces that structure the Internet. But we can also explain the Internet from completely different angle - namely, as an infrastructure that gives services to applications. These applications contain electronic mail, Web surfing,

Tags network core, packet switches, routers
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
1122
Network Protocols
Network Protocols

A network protocol is like a human protocol, except that the entities exchanging messages and taking actions are hardware or software elements of some device (for instance, computer, PDA, cell phone, router, or other network-capable device). All activity in the Internet that

Tags network protocol, routers, computer network
1892
The Network Edge
The Network Edge

In the preceding section we presented a high-level outline of the Internet and networking protocols. We are now going to look into a bit more deeply into the components of a computer network (and the Internet, particularly). We begin in this section at the edge of a network and

Tags network core, computer networking, end systems
1452
Client and Server Programs
Client and Server Programs

In the context of networking software, there is another definition of a client and server, a definition that we'll refer to throughout this book. A client program is a program running on one end system that requests and receives a service from a server program running on another end

Tags internet applications, distributed applications, server
1419
Access Networks
Access Networks

Having considered the applications and end systems at the "edge of the network" let's next consider access networks - the physical links that attach an end system to the first router (also known as the "edge router") on a path from the end system to any other distant end system.

Tags end systems, telco, links
2519
Dial-Up
Dial-Up

Back in the 1990s, almost all residential users accessed the Internet over ordinary analog telephone lines using a dial-up modem. Today, numerous users in underdeveloped countries and in rural areas in developed countries (where broadband access is unavailable) still access

Tags modem, isp, analog phone line
1978
DSL
DSL

Today the two most common types of broadband residential access are digital subscriber line (DSL) and cable. In most developed countries today, more than 50% of the households have broadband access, with South Korea, Iceland, Netherlands, Denmark, and Switzerland leading

Tags transmission rate, isp, telco
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