By Kent Hundley
By means of delivering the hot provider Routing Certification application, Alcatel-Lucent is extending their succeed in and information to networking pros with a finished demonstration of the way to construct shrewdpermanent, 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 while construction scalable networks, examines the main winning recommendations to be had for engineers who're development and working IP networks, and gives overviews of the web, IP routing and the IP layer, and the perform of starting the shortest direction first.
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By means of supplying the recent carrier Routing Certification application, Alcatel-Lucent is extending their succeed in and data to networking execs with a entire demonstration of the way to construct shrewdpermanent, scalable networks. Serving as a "course in a book" from Alcatel-Lucent—the international chief in designing and constructing scalable systems—this source pinpoints the pitfalls to prevent while development scalable networks, examines the main winning 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 beginning the shortest course first.
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Additional resources for Alcatel-Lucent Scalable IP Networks Self-Study Guide: Preparing for the Network Routing Specialist I (NRS 1) Certification Exam (4A0-100)
Some applications, such as the Dynamic Host Configuration Protocol (DHCP) and the Trivial File Transfer Protocol (TFTP), use UDP because they only require a simple datagram transfer. The Internet Protocol Layer The Internet Protocol layer provides a common addressing plan for all hosts on the Internet as well as a simple, unreliable datagram transfer service between these hosts. IP is the common glue that connects the Internet. IP also defines the way a datagram (or packet) is routed to its final destination.
This allows routers to make forwarding decisions for the datagrams they receive. In later chapters, you will learn about some key IP routing protocols such as Open Shortest Path First (OSPF) and Border Gateway Protocol (BGP). These topics are covered in much greater detail in later chapters, so for now, all that you need to understand is that routing protocols allow for the delivery of packets from one “hop” or router to the next in a predictable manner. indd 20 C h a p t e r 1 n I n t roduc t ion T o N e t wor k i ng 6/3/09 8:00:01 PM The Network Interfaces Layer The network interfaces layer comprises the hardware that supports the physical interconnection of all network devices.
In an IP network, the forwarding of packets across the network is handled by routers. IP routers examine the destination address of a datagram and determine which router would be the next hop to provide the best route to the destination. The router forwards the packet to the next hop router, where the process is repeated until the datagram reaches its destination. This is known as hop-by-hop routing. Routers communicate with each other using dynamic routing protocols to exchange information about the networks they are connected to.