Computer Networks Xie Xiren ed. 6th Edition Chapter 4 After class Exercise Answer 5

Chapter 4 Network Layer.

4-01What are the two types of services provided by the network layer? Try to compare its advantages and disadvantages.

Answer: Virtual circuit services and datagram services.

Advantages of virtual circuits: virtual circuit services are connection-oriented, and the network can ensure that packets always arrive at the destination station in the order of transmission, without loss or duplication, and provide reliable end-to-end data transmission; The destination address is only used in the connection establishment stage, and each packet uses a short virtual circuit number, so that the number of bits in the control information part of the packet is reduced, and the additional overhead is reduced. End-to-end error handling and flow control can be the responsibility of the packet-switched network or the user machine. The virtual circuit service is suitable for occasions with large amount of communication information, high speed requirements, and high transmission reliability requirements.

Disadvantages of virtual circuits: virtual circuit services must establish a connection; Packets belonging to the same virtual circuit always follow the same route**; When a node fails, all virtual circuits passing through the faulty node do not work.

Advantages of datagrams: datagram services do not require a connection; Each packet independently selects a route for **, and when a node fails, subsequent packets can choose another route, thus improving the reliability of communication. The datagram service has good flexibility, and is suitable for occasions where the transmission reliability requirements are not high, the load of the communication subnet is unbalanced, and the best path needs to be selected.

Disadvantages of datagram: the datagram service is connection-oriented, and it may not be sent in order when it arrives at the destination station, and the packets in transmission may be lost and duplicated, providing connection-oriented and unreliable data transmission; Each group must have the full address of the destination station; When a network fails, the faulty node may lose data and some routes may change. End-to-end error handling and flow control are the sole responsibility of the host.

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Summary. Computer Networks 7th Edition Exercise Complete Answers.

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Web Links. Computer network refers to a computer system that connects multiple computers with independent functions and their external devices with different geographical locations through communication lines to achieve resource sharing and information transmission under the management and coordination of network operating systems, network management software and network communication protocols.

Computer Network is the most widely used and authoritative classic textbook of computer network at home and abroad compiled by Xie Xiren. Since its first publication in 1989, revised editions have been published in 1994, 1999 and 2003. In August 2006, this textbook passed the review of the Ministry of Education and was included in the "Eleventh Five-Year Plan" national planning textbook for general higher education.

The 5th edition of Computer Networks has undergone significant changes in terms of content and structure.

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The seventh edition of computer networks, Xie Xiren's after-class exercises, the answers are on the back of the book!!

The title of the seventh edition is similar to that of the sixth edition, so you can check it out.

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b send 0c not sent.

d send 1

1. Since its first publication in 1989, Computer Networks (6th Edition) edited by Xie Xiren has been revised in 1994, 1999, 2003 and 2008. In 2006, the book passed the review of the Ministry of Education and was included in the "Eleventh Five-Year Plan" national planning textbook for general higher education.

2. On the basis of the original structure and content, the 6th edition of Computer Network has made necessary additions, adjustments and modifications according to the requirements of the syllabus and the latest development of computer networks to meet the needs of current teaching.

4. Computer Networks (6th Edition) is characterized by accurate concepts, rigorous discussions, novel contents, and excellent content, highlighting the elaboration of basic principles and basic concepts, and trying to reflect some of the latest developments in computer networks. This book can be used by undergraduate and graduate students majoring in electrical information and computer science, and also has reference value for engineers and technicians engaged in computer network work.