CCNA 1 v6.0 Chapter 9: Transport Layer: Check your Understanding Answers
1. What are the primary purposes of the transport layer? (Choose three.)
- Determining the best route between source and destination
- Adding the source and destination MAC address to frames
- Tracking the individual communication between applications on the source and destination hosts
- Adding the source and destination IP address
- Segmenting data for and reassembling segmented data into streams of application data at the destination
- Identifying the proper application for each communication stream
2. What is assigned by the transport layer to identify an application or service?
- MAC address
- IP address
3. Fill in the blank.
_____ is the term used to describe the interleaving of data from multiple users on the same network.
4. What is a characteristic of UDP?
- Reliable delivery
- Expectational acknowledgements
- Flow control
5. Which of the following types of applications would use UDP? (Choose three.)
6. Which TCP header field specifies the number of segments that can be accepted before an acknowledgement is required?
- Acknowledgement number
- Header length
- Window size
7. Fill in the blank.
Both TCP and UDP use ____ to separate multiple communications on the same channel.
8. What is an advantage that UDP has over TCP?
- Advanced flow control
- Low overhead
- Reordering of segments
- Reliable delivery
9. What range of ports can either be used by TCP to identify the requested service on the destination device or as a client source port?
- 0 to 1023
- 0 to 49151
- 1024 to 49151
- 49152 to 65535
10. Fill in the blank.
A dynamic port in the range of 49152 to 65535 is also known as a(n) ____ port.
11. What does UDP do when receiving messages that are more than one datagram in length?
- UDP place the datagrams into the correct order before passing them to the application.
- UDP reassembles that data in the order it was received and passes it to the application.
- UDP requests retransmission of the datagrams in the correct order before passing to the application.
- UDP transmissions are limited to a single datagram.
12. Which TCP header control bit is set on to terminate a TCP conversation?
13. If a client sends an ISN of 2 to a server and a server responds with an ISN of 1 to the client, what is the final stage of the TCP three-way handshake?
- Client sends an acknowledgement of 2.
- Server sends an acknowledgement of 2.
- Client sends an acknowledgement of 3.
- Server sends an acknowledgement of 3.
- Client sends a new ISN of 3.
- Server sends a new ISN of 2.
14. A client is downloading a large file from a server using FTP. One of the segments is lost during transit. What will happen?
- The FTP session is immediately terminated.
- The FTP client responds to the server with a smaller window size in the TCP header.
- The FTP client responds to the client with an increased window size in the TCP header.
- The FTP server responds to the client with a smaller window size in the TCP header.
- The FTP server responds to the client with an increased window size in the TCP header.
- The FTP session continues, but the result is a corrupt file that must be downloaded again.
- The FTP session continues with no alteration in window size, and the missing segment is requested again after the rest of the file is downloaded.
15. Fill in the blank.
TCP will normally retransmit lost data from the last successful acknowledgement. To allow the destination to acknowledge bytes in discontinuous segments and request retransmission of only the missing data, both hosts must be able to support an optional feature called __________.