End Systems

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
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
1040
Coaxial Cable
Coaxial Cable

Like twisted pair, coaxial cable is made of two copper conductors, but the two conductors are concentric rather than parallel. With this construction and special insulation and shielding, coaxial cable can have high bit rates. Coaxial cable is quite common in cable television

Tags modem, end systems, analog signal
3478
ISPs and Internet Backbones
ISPs and Internet Backbones

We saw earlier that end systems (user PCs, PDAs, Web servers, mail servers, and so on) connect into the Internet via a local ISP. The ISP can supply either wired or wireless connectivity, using an array access technologies including DSL, cable, FTTH, Wi-Fi, cellular, and WiMAX.

Tags end systems, transmission rate, packets
2452
Protocol Layers and Their Service Models
Protocol Layers and Their Service Models

From our discussion so far, it is obvious that the Internet is very complicated system. We have seen that there are many pieces to the Internet: various applications and protocols, different types of end systems, packet switches, and several types of link-level media. Given

Tags end systems, packet switches, computer networking
2101
Principles of Network Applications
Principles of Network Applications

Consider you have an idea for a new network application. Maybe this application will be a great service to humanity, or will please your professor, or will bring you great wealth, or will simply be fun to develop. Whatever the motivation may be, let's now study how you

Tags network application, end systems, routers
3141
Network Application Architectures
Network Application Architectures

Before diving into software coding, you should have a big architectural plan for your application. Keep in mind that an application's architecture is particularly different from the network architecture (e.g., the five-layer Internet architecture discussed in "Computer Networks

Tags end systems, network applications, p2p architecture
2493
Processes Communicating
Processes Communicating

Before building your network application, you also need a basic understanding of how the programs, running in various end systems, communicate with each other. In the terminology of operating systems, it is not in fact programs but processes that communicate. A process

Tags network application, end systems, computer network, application layer
1270
Application-Layer Protocols
Application-Layer Protocols

We have just studied that network processes communicate with each other by sending messages into sockets. But how are these messages structured? What are the meanings of the various fields in the messages? When do the processes send the messages? These questions bring

Tags sockets, application-layer protocol, end systems, internet applications
1657
Application-Layer Protocols
Application-Layer Protocols

We have just studied that network processes communicate with each other by sending messages into sockets. But how are these messages structured? What are the meanings of the various fields in the messages? When do the processes send the messages? These questions bring

Tags sockets, application-layer protocol, end systems, internet applications
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