By Keith W. Ross, James F. Kurose
Computer Networking maintains with an early emphasis on application-layer paradigms and alertness programming interfaces (the most sensible layer), encouraging a hands-on adventure with protocols and networking suggestions, prior to operating down the protocol stack to extra summary layers.
This e-book has turn into the dominant booklet for this direction as a result authors’ reputations, the precision of clarification, the standard of the paintings application, and the price in their personal supplements.
Visit the authors’ web publication for info and assets to debate the latest version, in addition to important insights, educating counsel, and dialogue in regards to the box of laptop Networking http://kuroseross.com
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Extra resources for Computer Networking: A Top-Down Approach (6th Edition)
Generally speaking, people who do not like to hassle with restaurant reservations prefer packet switching to circuit switching. Why is packet switching more efficient? Let’s look at a simple example. Suppose users share a 1 Mbps link. Also suppose that each user alternates between periods of activity, when a user generates data at a constant rate of 100 kbps, and periods of inactivity, when a user generates no data. Suppose further that a user is active only 10 percent of the time (and is idly drinking coffee during the remaining 90 percent of the time).
For example, suppose Joe is driving from Philadelphia to 156 Lakeside Drive in Orlando, Florida. Joe first drives to his neighborhood gas station and asks how to get to 156 Lakeside Drive in Orlando, Florida. The gas station attendant extracts the Florida portion of the address and tells Joe that he needs to get onto the interstate highway I-95 South, which has an entrance just next to the gas station. He also tells Joe that once he enters Florida, he should ask someone else there. Joe then takes I-95 South until he gets to Jacksonville, Florida, at which point he asks another gas station attendant for directions.
Packet forwarding is actually done in different ways in different types of computer networks. Here, we briefly describe how it is done in the Internet. In the Internet, every end system has an address called an IP address. When a source end system wants to send a packet to a destination end system, the source includes the destination’s IP address in the packet’s header. As with postal addresses, this address has a hierarchical structure. When a packet arrives at a router in the network, the router examines a portion of the packet’s destination address and forwards the packet to an adjacent router.