By Keith W. Ross, James F. Kurose
Computer Networking keeps with an early emphasis on application-layer paradigms and alertness programming interfaces (the best layer), encouraging a hands-on event with protocols and networking suggestions, prior to operating down the protocol stack to extra summary layers.
This ebook has develop into the dominant e-book for this path a result of authors’ reputations, the precision of clarification, the standard of the paintings software, and the price in their personal supplements.
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Extra info for Computer Networking: A Top-Down Approach (6th Edition)
You raise your hand (transmitting an implicit message to the teacher). Your teacher acknowledges you with a smile, saying “Yes . ” (a transmitted message encouraging you to ask your question—teachers love to be asked questions), and you then ask your question (that is, transmit your message to your teacher). Your teacher hears your question (receives your question message) and answers (transmits a reply to you). Once again, we see that the transmission and receipt of messages, and a set of conventional actions taken when these messages are sent and received, are at the heart of this question-and-answer protocol.
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). 3 • THE NETWORK CORE all times. For example, with circuit-switched TDM, if a one-second frame is divided into 10 time slots of 100 ms each, then each user would be allocated one time slot per frame.
The sequence of communication links and packet switches traversed by a packet from the sending end system to the receiving end system is known as a route or path through the network. The exact amount of traffic being carried in the Internet is difficult to estimate but Cisco [Cisco VNI 2011] estimates global Internet traffic will be nearly 40 exabytes per month in 2012. Packet-switched networks (which transport packets) are in many ways similar to transportation networks of highways, roads, and intersections (which transport vehicles).
Computer Networking: A Top-Down Approach (6th Edition) by Keith W. Ross, James F. Kurose