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Routing and Router Basics - WANs AND ROUTERs
A wide-area network (WAN) is a data communications network spanning a large geographic area such as a state, province, or country. WANs often use transmission facilities provided by common carriers, for example, telephone companies. These are the major characteristics of WANs: They connect devices that are separated by wide geographical areas. They use the services of carriers such as the Regional Bell Operating Companies (RBOCs),...
21 p dtu 18/12/2012 244 1
Từ khóa: Router Basics, wide-area network, data communications network, Networking basics, mạng cơ bản, kỹ thuật mạng, công nghệ mạng, Cisco Networking
Data Networks, IP and the Internet: Protocols, Design and Operation
The business world relies increasingly upon data communications, and modern data networks are based mainly on the Internet or at least on the IP (Internet Protocol). But despite these facts, many people remain baffled by IP and multiprotocol data networks. How do all the protocols fit together? How do I build a network? And what sort of problems should I expect? This book is intended for experienced network designers and practitioners, as well...
836 p dtu 20/11/2012 161 1
Từ khóa: Data Networks, dữ liệu mạng, Design networks, thiết kế mạng, kỹ thuật mạng, công nghệ mạng
Satellites for communication services have evolved quite significantly in size and power since the launch of the first commercial satellites in 1965. This has permitted a consequent reduction in the size of earth stations, and hence their cost, with a consequent increase in number. Small stations, with antennas in the order of 1.2–1.8 rn, have become very popular under the acronym VSAT, which stands for ’Very Small Aperture Terminals’....
296 p dtu 10/11/2012 176 1
Từ khóa: communication services, commercial satellites, monitoring data, VSAT networks, mạng viễn thông, công nghệ viễn thông, hệ thống thông tin
Hardening IEEE 802.11 wireless networks
IEEE 802.11 is a Wireless Local Area Network (WLAN) standard which specifies a radio interface and Layer 2 (Link Layer) protocol for data communications in the 2.4 Ghz spectrum. 802.11b supports up to 11 Mbps of capacity, depending on what part of the world you are in, and has a range of up to a hundred meters or more in open spaces, but more like 50 Meters in a practical office environment using off the shelf equipment. 802.11b is not just...
20 p dtu 10/11/2012 174 1
Từ khóa: wireless networks, Wireless Local Area Network, data communications, truyền thông dữ liệu, kỹ thuật mạng, công nghệ mạng
The General Packet Radio Service (GPRS) allows an end user to send and receive data in packet transfer mode within a public land mobile network (PLMN) without using a permanent connection between the mobile station (MS) and the external network during data transfer. This way, GPRS optimizes the use of network and radio resources (RRs) since, unlike circuitswitched mode, no connection between the MS and the external network is established when...
241 p dtu 07/11/2012 196 1
Từ khóa: data transfer, mobile network, EDGE for Mobile Internet, kỹ thuật viễn thông, công nghệ viễn thông, khoa học công nghệ
While many industry experts around the world have dubbed me as a ‘Wireless Guru’, I find the need to provide my definition of ‘Wireless Guru’. A ‘Wireless Guru’ is someone who has great knowledge of the entire range of wireless technologies while having an expertise in at least one field. My fields of choice to obtain expertise are in Wireless Data Networks and Wireless Information Security. In this book I have endeavored to...
255 p dtu 04/11/2012 228 2
Từ khóa: Wireless Data Technologies, wireless technologies, Wireless Data Networks, công nghệ không dây, kỹ thuật viễn thông, công nghệ viễn thông
The surefire way to get ahead is to think ahead. So, while you are working in the here-and-now (whether revamping a client’s Web site or upgrading the client’s supply chain), there’s no time like the present to examine technologies that haven’t been widely adopted but could have a huge impact on enterprises during the next 10 years. Take wireless data networks, for instance: Anywhere, anytime access to corporate data from your...
594 p dtu 04/11/2012 247 2
Từ khóa: Wireless data demystified, examine technologies, wireless data networks, mạng không dây, công nghệ viễn thông, kỹ thuật viễn thông
Advanced wired and wireless networks
We live in the era of information revolution triggered by a widespread availability of Internet and Internet based applications, further enhanced by an introduction of wireless data networks and extension of cellular networks beyond traditional mobile telephony through an addition of the mobile Internet access. The Internet has become so useful in all areas of life that we always want more of it. We want ubiquitous access (anywhere, anytime),...
281 p dtu 01/11/2012 218 2
Từ khóa: Advanced wired and wireless networks, information revolution, wireless data networks, cách mạng thông tin, khoa học công nghệ, công nghệ mạng