Take the quiz (either here or use the PTP software) if you want to use the score to help you decide how much time to spend on this chapter. Appendix A, “Answers to the ‘Do I Know This Already?’ Quizzes,” found at the end of the book, includes both the answers and explanations. You can…
Category: Ciscco Certifed Support Technici
Users tend to think of “the network” as a sort of virtual thing: it exists “out there,” but where “there” is, and how bits are translated into signals, signals are carried from place to place, and data is processed are all something of a mystery. Network engineers, however, know that while networks can be described…
Traceroute is another helpful piece of network diagnostics software installed on most hosts. Traceroute takes advantage of the TTL in each IP packet to find the path between the local host and a destination. If you run a traceroute from host A in Figure 4-16 toward E: 1. The traceroute application at A will send…
Ookla’s (and similar) tools test your connection to the Internet, giving you throughput and delay. iPerf tests your network—either locally or to a publicly accessible server—and gives you throughput. Mike’s Traceroute (MTR) shows you the delay and jitter across a network Note MTR runs only on Linux-like systems, so if you want to run it…
Racks of equipment, wire running all over the place, lights blinking on and off—when you walk into a large room holding lots of networking gear, you might wonder, “What is all this stuff?” You might feel like the person in Figure 10-1. Figure 10-1 Racks of Equipment The good news is there are only a…
A command-line interface ( CLI) is interactive: the user types commands, and the host returns some response, usually text. Network engineers tend to work with CLIs more than GUIs because • CLIs tend to respond more quickly. • CLIs require fewer resources so they can be implemented in a broader range of devices. • Text…
Open the System Preferences app and select the Network icon. Figure 4-8 illustrates the resulting dialog. Figure 4-8 The macOS Network Configuration Dialog For the wired connection, select either the Ethernet port or a port labeled LAN (Local Area Network). Fields of note include • IPv4 Address: The IPv4 address assigned to the interface. •…
Finally, you can find information about network configuration in the System Information application, customarily located under Utilities in Finder. Two sections contain information on wired network interfaces: Ethernet and Network Locations. Figure 4-11 shows the information in the System Information Ethernet section. Figure 4-11 Ethernet Section of System Information The Ethernet section of System Information…