14.8.3 Module Quiz – Transport Layer Answers
1. Network congestion has resulted in the source learning of the loss of TCP segments that were sent to the destination. What is one way that the TCP protocol addresses this?
- The source decreases the amount of data that it transmits before it receives an acknowledgement from the destination.
- The source decreases the window size to decrease the rate of transmission from the destination.
- The destination decreases the window size.
- The destination sends fewer acknowledgement messages in order to conserve bandwidth.
2. Which two operations are provided by TCP but not by UDP? (Choose two.)
- identifying the applications
- acknowledging received data
- tracking individual conversations
- retransmitting any unacknowledged data
- reconstructing data in the order received
3. What is the TCP mechanism used in congestion avoidance?
- three-way handshake
- socket pair
- two-way handshake
- sliding window
4. What is a responsibility of transport layer protocols?
- providing network access
- tracking individual conversations
- determining the best path to forward a packet
- translating private IP addresses to public IP addresses
5. How does a networked server manage requests from multiple clients for different services?
- The server sends all requests through a default gateway.
- Each request is assigned source and destination port numbers.
- The server uses IP addresses to identify different services.
- Each request is tracked through the physical address of the client.
6. Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two)
7. What is the purpose of using a source port number in a TCP communication?
- to notify the remote device that the conversation is over
- to assemble the segments that arrived out of order
- to keep track of multiple conversations between devices
- to inquire for a nonreceived segment
8. Which number or set of numbers represents a socket?
9. Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.)
10. What happens if part of an FTP message is not delivered to the destination?
- The message is lost because FTP does not use a reliable delivery method.
- The FTP source host sends a query to the destination host.
- The part of the FTP message that was lost is re-sent.
- The entire FTP message is re-sent.
11. What type of applications are best suited for using UDP?
- applications that are sensitive to delay
- applications that need reliable delivery
- applications that require retransmission of lost segments
- applications that are sensitive to packet loss
12. Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?
- The client sets the window size for the session.
- The client sends an ISN to the server to start the 3-way handshake.
- The client randomly selects a source port number.
- The client sends a synchronization segment to begin the session.
13. Which transport layer feature is used to guarantee session establishment?
- UDP ACK flag
- TCP 3-way handshake
- UDP sequence number
- TCP port number
14. What is the complete range of TCP and UDP well-known ports?
- 0 to 255
- 0 to 1023
- 256 – 1023
- 1024 – 49151
15. What is a socket?
- the combination of the source and destination IP address and source and destination Ethernet address
- the combination of a source IP address and port number or a destination IP address and port number
- the combination of the source and destination sequence and acknowledgment numbers
- the combination of the source and destination sequence numbers and port numbers