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CP multiplexing and demultiplexing. Consider the figure below, with 6 sockets shown across the etwork, and the corresponding Python code at each host. There are four TCP segments in flight. mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 3200) #sockets to clients created via #later calls to mySocket.accept() mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 6515) P1 transport network link physical B source port: ? dest port: ? Segment B destination port # Segment A destination port # Segment C destination port # Segment C source port # P4 Segment B source port # Segment D destination port # Segment D source port # Segment A source port # A source port: ? dest port: ? Ka P5 transport etwork link physical P6 mySocket1 = socket (AF_INET, SOCK_STREAM) mySocket1.bind (myaddr, 6287 ); mySocket2 = socket (AF_INET, SOCK_STREAM) mySocket2.bind (myaddr, 5313 ); D source port: ? dest port: ? source port: ? dest port: ? P2 Which of the following source or destination port number fields in these four segments has the value of 200? P3 transport network link physical

CP multiplexing and demultiplexing. Consider the figure below, with 6 sockets shown across the etwork, and the corresponding Python code at each host. There are four TCP segments in flight. mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 3200) #sockets to clients created via #later calls to mySocket.accept() mySocket = socket (AF_INET, SOCK_STREAM) mySocket.bind (myaddr, 6515) P1 transport network link physical B source port: ? dest port: ? Segment B destination port # Segment A destination port # Segment C destination port # Segment C source port # P4 Segment B source port # Segment D destination port # Segment D source port # Segment A source port # A source port: ? dest port: ? Ka P5 transport etwork link physical P6 mySocket1 = socket (AF_INET, SOCK_STREAM) mySocket1.bind (myaddr, 6287 ); mySocket2 = socket (AF_INET, SOCK_STREAM) mySocket2.bind (myaddr, 5313 ); D source port: ? dest port: ? source port: ? dest port: ? P2 Which of the following source or destination port number fields in these four segments has the value of 200? P3 transport network link physical

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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### TCP Multiplexing and Demultiplexing #### Concept Overview Consider the following figure, which demonstrates the concepts of TCP multiplexing and demultiplexing. The figure shows 6 sockets distributed across a network, each represented by layers (transport, network, link, and physical) and corresponding Python code for socket binding at each host. Four TCP segments are currently in flight between these sockets, identified as A, B, C, and D. #### Diagram Explanation The figure below illustrates: 1. **Host 1** with a Python code snippet: ```python mySocket = socket(AF_INET, SOCK_STREAM) mySocket.bind(myaddr, 3200) # sockets to clients created via later calls to mySocket.accept() ``` - This host binds to address `myaddr` on port `3200`. 2. **Host 2** with Python code snippets: ```python mySocket1 = socket(AF_INET, SOCK_STREAM) mySocket1.bind(myaddr, 6287) mySocket2 = socket(AF_INET, SOCK_STREAM) mySocket2.bind(myaddr, 5313) ``` - This host binds to address `myaddr` on ports `6287` and `5313`. 3. **Host 3** with Python code: ```python mySocket = socket(AF_INET, SOCK_STREAM) mySocket.bind(myaddr, 6515) ``` - This host binds to address `myaddr` on port `6515`. The network consists of multiple routers and a transport layer handling communication via these sockets. There are four TCP segments A, B, C, and D with unknown source and destination ports. #### Network Layout - **Hosts P1, P2, and P3** show transport layers communicating over physical, link, and network layers. - **Routers P4, P5, and P6** facilitate communication by routing packets at the network layer. #### TCP Segments in Flight Segments A, B, C, and D are shown originating and terminating between different sockets, and their port numbers are to be inferred. ### Question - **Question:** Which of the following source or destination port number fields in these four segments has the value of 3200? **Answer Choices:** 1. Segment B destination port # 2. Segment A destination port # 3. Segment C destination port # 4. Segment
Transcribed Image Text:### TCP Multiplexing and Demultiplexing #### Concept Overview Consider the following figure, which demonstrates the concepts of TCP multiplexing and demultiplexing. The figure shows 6 sockets distributed across a network, each represented by layers (transport, network, link, and physical) and corresponding Python code for socket binding at each host. Four TCP segments are currently in flight between these sockets, identified as A, B, C, and D. #### Diagram Explanation The figure below illustrates: 1. **Host 1** with a Python code snippet: ```python mySocket = socket(AF_INET, SOCK_STREAM) mySocket.bind(myaddr, 3200) # sockets to clients created via later calls to mySocket.accept() ``` - This host binds to address `myaddr` on port `3200`. 2. **Host 2** with Python code snippets: ```python mySocket1 = socket(AF_INET, SOCK_STREAM) mySocket1.bind(myaddr, 6287) mySocket2 = socket(AF_INET, SOCK_STREAM) mySocket2.bind(myaddr, 5313) ``` - This host binds to address `myaddr` on ports `6287` and `5313`. 3. **Host 3** with Python code: ```python mySocket = socket(AF_INET, SOCK_STREAM) mySocket.bind(myaddr, 6515) ``` - This host binds to address `myaddr` on port `6515`. The network consists of multiple routers and a transport layer handling communication via these sockets. There are four TCP segments A, B, C, and D with unknown source and destination ports. #### Network Layout - **Hosts P1, P2, and P3** show transport layers communicating over physical, link, and network layers. - **Routers P4, P5, and P6** facilitate communication by routing packets at the network layer. #### TCP Segments in Flight Segments A, B, C, and D are shown originating and terminating between different sockets, and their port numbers are to be inferred. ### Question - **Question:** Which of the following source or destination port number fields in these four segments has the value of 3200? **Answer Choices:** 1. Segment B destination port # 2. Segment A destination port # 3. Segment C destination port # 4. Segment
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