By Kent Hundley
Via supplying the hot carrier Routing Certification software, Alcatel-Lucent is extending their succeed in and data to networking pros with a accomplished demonstration of the way to construct clever, scalable networks. Serving as a "course in a book" from Alcatel-Lucent—the global chief in designing and constructing scalable systems—this source pinpoints the pitfalls to prevent whilst construction scalable networks, examines the main profitable ideas on hand for engineers who're construction and working IP networks, and gives overviews of the web, IP routing and the IP layer, and the perform of establishing the shortest course first.
Note: CD-ROM/DVD and different supplementary fabrics will not be incorporated as a part of e-book dossier.
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Extra resources for Alcatel-Lucent Scalable IP Networks Self-Study Guide: Preparing for the Network Routing Specialist I (NRS 1) Certification Exam (4A0-100)
The data link layer is the term used to describe the network interfaces used by IP for physically transmitting the data across the network. The units of data transmitted at the data link layer are usually known as frames. IP datagrams must always be encapsulated in some type of Data Link frame for transmission. 11 The network layer adds source and destination IP addresses so that the packet can be forwarded through the network. 12 Header Header Body Header Body Network interfaces A typical Data Link frame contains a header, usually containing some type of address.
Some of the protocols commonly used at this layer include Asynchronous Transfer Mode (ATM), Frame-Relay, Point to Point Protocol (PPP), and Ethernet. However, there are many other protocols used; some are open standards, and some are proprietary. The diversity of the network interfaces layer demonstrates one of the benefits of protocol layering. As new transmission technologies are developed, it is not necessary to make changes to the upper layers to incorporate these technologies into the network.
Government agency networks were reserved for government-oriented missions exclusively. In fact, this policy continued into the early 1990s. However, as more peer networks began to be connected and new and different types of communications evolved, additional pressures mounted on the NSFNET administrators to provide additional connectivity and features. As the NSFNET grew, there began to be a lot of commercial and general purpose interest in obtaining network access and interconnectivity. This, in turn, gave rise to an entire industry of network service providers (also known as Internet service providers, or ISPs) willing to fulfill this need for network connectivity.