1. What are two roles of the transport layer in data communication on a network? (Choose two.)
- tracking the individual communication between applications on the source and destination hosts
- performing a cyclic redundancy check on the frame for errors
- identifying the proper application for each communication stream
- providing the interface between applications and the underlying network over which messages are transmitted
- providing frame delimiting to identify bits making up a frame
2. During a TCP session, a destination device sends an acknowledgment number to the source device. What does the acknowledgment number represent?
- the last sequence number that was sent by the source
- one number more than the sequence number
- the total number of bytes that have been received
- the next byte that the destination expects to receive
3. Which two services or protocols use the preferred UDP protocol for fast transmission and low overhead? (Choose two)
4. Which transport layer feature is used to guarantee session establishment?
- TCP port number
- UDP ACK flag
- TCP 3-way handshake
- UDP sequence number
5. Data is being sent from a source PC to a destination server. Which three statements correctly describe the function of TCP or UDP in this situation? (Choose three.)
- The TCP source port number identifies the sending host on the network.
- The source port field identifies the running application or service that will handle data returning to the PC.
- UDP segments are encapsulated within IP packets for transport across the network.
- The UDP destination port number identifies the application or service on the server which will handle the data.
- TCP is the preferred protocol when a function requires lower network overhead.
- The TCP process running on the PC randomly selects the destination port when establishing a session with the server.
6. What is the purpose of the TCP sliding window?
- to end communication when data transmission is complete
- to request that a source decrease the rate at which it transmits data
- to inform a source to retransmit data from a specific point forward
- to ensure that segments arrive in order at the destination
7. 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 part of the FTP message that was lost is re-sent.
- The entire FTP message is re-sent.
- The FTP source host sends a query to the destination host.
8. Which two flags in the TCP header are used in a TCP three-way handshake to establish connectivity between two network devices? (Choose two.)
9. Which tool is used to provide a list of open ports on network devices?
10. Which two fields are included in the TCP header but not in the UDP header? (Choose two.)
- destination port
- sequence number
- source port
11. Refer to the exhibit. Which three lines represent the TCP three-way handshake?
- lines 6, 7, and 8
- lines 2, 3, and 4
- lines 2, 8, and 9
- lines 1, 2, and 3
- lines 4, 5, and 6
12. What is a characteristic of a TCP server process?
- A host running two different applications can have both configured to use the same server port.
- There can be many ports open simultaneously on a server, one for each active server application.
- An individual server can have two services assigned to the same port number within the same transport layer services.
- Every application process running on the server has to be configured to use a dynamic port number.