EBK COMPUTER NETWORKING
EBK COMPUTER NETWORKING
7th Edition
ISBN: 8220102955479
Author: Ross
Publisher: PEARSON
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Chapter 4, Problem P20P
Program Plan Intro

Internet Protocol (IP):

Internet protocol is a process or protocol in which data is transferred between the computer systems through internet. Each computer system has its own IP address to send or receive the required data.

Datagram:

  • In networking, a datagram is a transferring unit which is used to transfer the data from a source to the destination and it doesn’t provide guaranteed service.
  • It includes fragmentation process which is defined as the division of the data packet into small one when the data packets are larger than the maximum length of a particular system.

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P19. Consider the SDN OpenFlow network shown in Figure 4.30 . Suppose that the desired forwarding behavior for datagrams arriving at s2 is as follows: •any datagrams arriving on input port 1 from hosts h5 or h6 that are destined to hosts h1 or h2 should be forwarded over output port 2; •any datagrams arriving on input port 2 from hosts h1 or h2 that are destined to hosts h5 or h6 should be forwarded over output port 1;  •any arriving datagrams on input ports 1 or 2 and destined to hosts h3 or h4 should be delivered to the host specified;  •hosts h3 and h4 should be able to send datagrams to each other. Specify the flow table entries in s2 that implement this forwarding behavior.
we consider some of the pros and cons of virtual-circuit and datagram networks. a. Suppose that routers were subjected to conditions that might cause them to fail fairly often. Would this argue in favor of a VC or datagram architecture? Why? b. Suppose that a source node and a destination require that a fixed amount of capacity always be available at all routers on the path between the source and destination node, for the exclusive use of traffic flowing between this source and destination node. Would this argue in favor of a VC or datagram architecture? Why? c. Suppose that the links and routers in the network never fail and that rout- ing paths used between all source/destination pairs remains constant. In this scenario, does a VC or datagram architecture have more control traffic overhead? Why?
4) Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up through byte 130. Suppose Host A then sends two segments to Host B back-to-back. The first and second segments contain 80 and 40 bytes of data, respectively. In the first segment, the sequence number is 131, the source port number is 301, and the destination port number is 80. Host B sends an acknowledgment whenever it receives a segment from Host A. a. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number? b. If the first segment arrives before the second segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number, the source port number, and the destination port number? c. If the second segment arrives before the first segment, in the acknowledgment of the first arriving segment, what is the acknowledgment number?
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