Transport Layer in Computer Networks
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Questions and Answers

What is the primary purpose of the source port field in a TCP header?

  • To control the flow of data between devices
  • To identify the source application by port number (correct)
  • To indicate the sequence number of the segment
  • To identify the destination application

    • What is the purpose of the acknowledgment number field in a TCP header?

  • To identify the destination application
  • To indicate the next byte expected from the source (correct)
  • To indicate the sequence number of the segment
  • To control the flow of data between devices

    • What is the primary function of the header length field in a TCP header?

  • To identify the destination application
  • To indicate the sequence number of the segment
  • To control the flow of data between devices
  • To indicate the length of the TCP segment header (correct)

    • What is the purpose of the window size field in a TCP header?

    <p>To indicate the number of bytes that can be accepted at one time</p> Signup and view all the answers

    What is the primary function of the checksum field in a TCP header?

    <p>To check for errors in the segment header and data</p> Signup and view all the answers

    How many bytes are required for the UDP header?

    <p>8 bytes</p> Signup and view all the answers

    What is the primary function of TCP?

    <p>To provide reliability and reordering of segments</p> Signup and view all the answers

    What is a characteristic of UDP?

    <p>Data is reconstructed in the order that it is received</p> Signup and view all the answers

    What is the primary purpose of the Source Port field in the UDP header?

    <p>To identify the source application</p> Signup and view all the answers

    Which of the following applications would likely use UDP?

    <p>Live video streaming services</p> Signup and view all the answers

    What is a key difference between TCP and UDP?

    <p>TCP is more reliable than UDP</p> Signup and view all the answers

    What is the purpose of the Checksum field in the UDP header?

    <p>To detect errors in the datagram</p> Signup and view all the answers

    Why are port numbers used in TCP and UDP transport layer protocols?

    <p>To manage multiple, simultaneous conversations</p> Signup and view all the answers

    What type of communication is an example of an application that handles reliability itself?

    <p>Unidirectional communication</p> Signup and view all the answers

    How many fields are present in the UDP header?

    <p>4 fields</p> Signup and view all the answers

    Which of the following is an example of a simple request and reply application that uses UDP?

    <p>DNS</p> Signup and view all the answers

    Which of the following protocols uses port 53?

    <p>DNS</p> Signup and view all the answers

    What is the purpose of the netstat command?

    <p>To verify connections and identify potential security threats</p> Signup and view all the answers

    Which of the following port numbers is registered by Cisco for its RADIUS server authentication process?

    <p>1812</p> Signup and view all the answers

    What is the primary purpose of well-known port numbers?

    <p>To provide a standard set of ports for common network services</p> Signup and view all the answers

    What is the purpose of ephemeral ports?

    <p>To assign temporary ports to client applications</p> Signup and view all the answers

    Which of the following protocols uses port 443?

    <p>HTTPS</p> Signup and view all the answers

    What is the range of private and/or dynamic ports?

    <p>1024-49151</p> Signup and view all the answers

    Which of the following protocols uses port 22?

    <p>SSH</p> Signup and view all the answers

    What is the primary function of flow control in TCP?

    <p>To regulate the amount of data that can be sent at one time</p> Signup and view all the answers

    What is the relationship between the Ethernet maximum transmission unit (MTU) and the Maximum Segment Size (MSS)?

    <p>The MSS is determined by subtracting the IP and TCP headers from the MTU</p> Signup and view all the answers

    What happens when congestion occurs on a network?

    <p>Packets are discarded by the overloaded router</p> Signup and view all the answers

    What is a key feature of Selective ACK (SACK)?

    <p>It allows the receiver to explicitly acknowledge which segments were received</p> Signup and view all the answers

    What is the advantage of UDP's low overhead?

    <p>It reduces the amount of datagram header information</p> Signup and view all the answers

    What is the purpose of TCP's congestion handling mechanisms?

    <p>To reduce the rate of data transmission during congestion</p> Signup and view all the answers

    What is the default Ethernet maximum transmission unit (MTU) in bytes?

    <p>1500</p> Signup and view all the answers

    What is the result of subtracting the IP and TCP headers from the Ethernet MTU?

    <p>1460 bytes</p> Signup and view all the answers

    What is the primary role of the transport layer in data communication?

    <p>Establishing logical communications between applications</p> Signup and view all the answers

    What is the term used to describe a set of data flowing between a source application and a destination application?

    <p>Conversation</p> Signup and view all the answers

    What is the purpose of adding header information to data in the transport layer?

    <p>To perform different functions in managing data communication</p> Signup and view all the answers

    How does the transport layer enable different communication conversations to be interleaved on the same network?

    <p>Through segmentation and multiplexing</p> Signup and view all the answers

    What is the primary responsibility of IP in data communication?

    <p>Structuring, addressing, and routing packets</p> Signup and view all the answers

    What is the main difference between the transport layer and IP?

    <p>The transport layer is responsible for managing conversations, while IP is concerned with packet routing</p> Signup and view all the answers

    What is the role of transport layer protocols in data communication?

    <p>To specify how to transfer messages between hosts and manage reliability requirements</p> Signup and view all the answers

    What is the relationship between the transport layer and the application layer?

    <p>The transport layer provides a link between the application layer and the lower layers</p> Signup and view all the answers

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