ENetwork Chapter 4 - CCNA 1

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1. After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

* 80


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

* This contains a Telnet request.

*This is a TCP header.



3. During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

*The packets will be delivered and reassembled at the destination.


4. Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result?

*reach a timeout and resend the data that needs to be acknowledged


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

*session establishment

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

*A termination request has been sent to 192.135.250.10.

*Communication with 64.100.173.42 is using HTTP Secure.



7. Refer to the exhibit. Host1 is in the process of setting up a TCP session with Host2. Host1 has sent a SYN message to begin session establishment. What happens next?Host1 sends a segment with the ACK flag = 0, SYN flag = 0 to Host2.

*Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.



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

*The local host is using three client sessions.

*The local host is using web sessions to a remote server.



9. What mechanism is used by TCP to provide flow control as segments travel from source to destination?

*window size



10. What is dynamically selected by the source host when forwarding data?

*source port



11. What are two features of the User Datagram Protocol (UDP)? (Choose two.)

*low overhead

*connectionless



12. With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

*0 to 1023


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

*identifies the communicating applications

*identifies multiple conversations between the hosts



14. Which three features allow TCP to reliably and accurately track the transmission of data from source to destination?

* flow control

* session establishment

*numbering and sequencing



15. Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

*UDP


16. Which event occurs during the transport layer three-way handshake?

*TCP initializes the sequence numbers for the sessions.


17. Which is an important characteristic of UDP?

* minimal delays in data delivery


18. Which information is found in both the TCP and UDP header information?

* source and destination



19. Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

* transport


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

* to enable a receiving host to forward the data to the appropriate application



21. Why is flow control used for TCP data transfer?

* to prevent the receiver from being overwhelmed by incoming data