TCP/IP Transport Layer Quiz: Port Numbers and Flow Control

Chapter 4: Transport Layer Concepts

Networking Questions and Answers

1. Transport Layer Header Analysis (Choose two)

   On the basis of the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

   1. This is a UDP header.
   2. This contains a Telnet request.
   3. This contains a TFTP data transfer.
   4. The return of this packet will have a remote host acknowledgment number of 43,693.
   5. This is a TCP header.

2. TCP/IP Well-Known Port Numbers Range

   In the TCP/IP data encapsulation, which range of port numbers identifies all known applications?

   1. 0–255
   2. 256–1022
   3. 0–1023
   4. 1024 to 2047
   5. 49,153 to 65,535

3. Purpose of Port Numbers in TCP Header

   Why are port numbers included in the TCP header of a segment?

   1. To indicate the correct router interface to be used to present a series of sessions.
   2. To determine which switch ports should receive or forward the segment.
   3. To determine which Layer 3 protocol should be used to encapsulate data.
   4. To allow the receiving host to forward the information to the appropriate application.
   5. To allow the receiving host to assemble the packet into the correct order.

4. OSI Layer for Reliable Flow Regulation

   What OSI model layer is responsible for regulating the flow of information from origin to destination, reliably and accurately?

   1. Application
   2. Presentation
   3. Session
   4. Transport
   5. Network

5. Characteristics of User Datagram Protocol (UDP) (Choose two)

   What are two characteristics of User Datagram Protocol (UDP)? (Choose two.)

   1. Flow Control
   2. Low overheads
   3. Connection (Note: This refers to its connectionless nature.)
   4. Connection-oriented
   5. Sequence and acknowledgment of receipt

6. TCP Operation in Wireshark Capture

   Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being done?

   1. Session establishment
   2. Retransmit segment
   3. Data transfer
   4. Disconnect session

7. Layer 4 Addressing Functions (Choose two)

   Which two options represent Layer 4 addressing functions? (Choose two.)

   1. Identifies the destination network.
   2. Identifies the source and destination hosts.
   3. Identifies the communicating applications.
   4. Identifies multiple conversations between hosts.
   5. Identifies communication devices in the local media.

8. Purpose of TCP Flow Control

   Why is flow control used for TCP data transfer?

   1. To synchronize the speed of data sent by the computer.
   2. To synchronize and order sequence numbers so data is sent in complete numerical order.
   3. To prevent the receiver from being overwhelmed by data.
   4. To synchronize window size on the server.
   5. To simplify data transfer to multiple hosts.

9. Analyzing Network Output (Choose two)

   Refer to the exhibit. What two pieces of information can be determined from the output shown? (Choose two.)

   1. The local host is using well-known port numbers to identify the source ports.
   2. A request for termination has been sent to 192.135.250.10.
   3. Communication with 64.100.173.42 is using secure HTTP.
   4. The local computer is accepting HTTP requests.
   5. 192.168.1.101:1042 is the execution of the three-way handshake to 128.107.229.50:80.