Host

1668
Circuit Switching
Circuit Switching

This blog is about computer networks, the Internet, and packet switching not about telephone networks and circuit switching. However, it is important to understand why the Internet and other computer networks use packet switching rather than the more traditional circuit-

Tags packet switching, circuit switching, host
4160
Delay, Loss, and Throughput in Packet-Switched Networks
Delay, Loss, and Throughput in Packet-Switched Networks

Back in "What is the Internet", we described that the Internet can be viewed as an infrastructure that gives services to allocated applications running on end systems. Preferably, we would like Internet services to be able to move as much data as we want between any two end

Tags throughput, host, packet switching
1235
The bad guys can put malware into your host via the Internet
The bad guys can put malware into your host via the Internet

We connect devices to the Internet because we want to receive/send data from/to the Internet. This contains all kinds of good stuff, including Web pages, e-mail messages, MP3s, telephone calls, live video, search engine results, and so on. But, unluckily, along with all that good stuff

Tags network application, host, computer network
1063
A Proliferation of Networks: 1980 - 1990
A Proliferation of Networks: 1980 - 1990

By the end of' the 1970s, about two hundred hosts were connected to the ARPAnet. By the end of the 1980s the number af hosts connected to the public Internet, a confederation of networks looking much like today's Internet, would reach a hundred thousand. The 1980s would be

Tags minitel system, host, computer network
5116
Multiplexing and Demultiplexing
Multiplexing and Demultiplexing

In this section we discuss transport-layer multiplexing and demultiplexing, that is, extending the host-to-host delivery service provided by the network layer to a process-to-process delivery service for applications running on the hosts. In order to keep the discussion concrete, we'll

Tags network layer, host, transport layer, socket, application protocol
5422
Connection-Oriented Multiplexing and Demultiplexing
Connection-Oriented Multiplexing and Demultiplexing

To understand TCP demultiplexing, we have to study TCP sockets and TCP connection establishment. One slight difference between a TCP socket and a UDP socket is that a TCP socket is identified by a four-tuple: (source IP address, source port number, destination IP address,

Tags tcp sockets, udp socket, host, segments
1268
Internet Control Message Protocol (ICMP)
Internet Control Message Protocol (ICMP)

Remember that the network layer of the Internet has three main components: the IP protocol, discussed in the previous section; the Internet routing protocols (including RIP, OSPF. and BGP), which are covered in Routing in the Internet and ICMP, which is the subject of this section.

Tags network layer, router, host, icmp, source quench message, ip protocol, ip address
1178
Ethernet Frame Structure
Ethernet Frame Structure

We can learn a lot about Ethernet by examining the Ethernet frame, which is illustrated in Figure 1. To give this discussion about Ethernet frames a tangible context, lets consider sending an IP datagram from one host to another host, with both hosts on the same

Tags ethernet frame, ip datagram, host, network layer
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