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Cisco CCNA1-Chapter-04  Correct Questions Answers 100%
01. Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.)

• This is a UDP header;
• This contains a Telnet request;
• This contains a TFTP data transfer;
• The return packet from this remote host will have an Acknowledgement; Number of 43693;
• This is a TCP header.

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

• 0 to 255;
• 256 to 1022;
• 0 to 1023;
• 1024 to 2047 ;
• 49153 to 65535 ;

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

• to indicate the correct router interface that should be used to forward a segment;
• to identify which switch ports should receive or forward the segment;
• to determine which Layer 3 protocol should be used to encapsulate the data;
• to enable a receiving host to forward the data to the appropriate application;
• to allow the receiving host to assemble the packet in the proper order.

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

• identifies the destination network;
• identifies source and destination hosts;
• identifies the communicating applications;
• identifies multiple conversations between the hosts;
• identifies the devices communicating over the local media.

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

• session establishment;
• segment retransmit;
• data transfer;
• session disconnect.

06.  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;
• The local host is listening for TCP connections using public addresses;
• The local host is using well-known port numbers to identify the source ports;
• The local host is performing the three-way handshake with 192.168.101:1037.

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

• sequencing;
• flow control;
• acknowledgments;
• source and destination port.

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

• encapsulation;
• flow control;
• connectionless services;
• session establishment;
• numbering and sequencing;
• best effort delivery.

09. Which is an important characteristic of UDP?

• acknowledgement of data delivery;
• minimal delays in data delivery;
• high reliability of data delivery;
• same order data delivery.

10. 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?

• 13;
• 53;
• 80;
• 1024;
• 728.

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

• The two applications exchange data;
• TCP initializes the sequence numbers for the sessions;
• UDP establishes the maximum number of bytes to be sent;
• The server acknowledges the bytes of data received from the client.

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

• to synchronize equipment speed for sent data;
• to synchronize and order sequence numbers so data is sent in complete numerical order;
• to prevent the receiver from being overwhelmed by incoming data;
• to synchronize window size on the server;
• to simplify data transfer to multiple hosts.

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

• TCP;
• IP;
• UDP;
• HTTP;
• DNS.

14. 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 not be delivered;
• The packets will be retransmitted from the source;
• The packets will be delivered and reassembled at the destination;
• The packets will be delivered and not reassembled at the destination.

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

• sequence numbers;
• session establishment;
• window size;
• acknowledgments.

16.  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?

• create a Layer 1 jam signal ;
• reach a timeout and resend the data that needs to be acknowledged;
• send a RESET bit to the host;
• change the window size in the Layer 4 header.

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

• destination logical address;
• source physical address;
• default gateway address;
• source port.

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

• application;
• presentation;
• session;
• transport;
• network;

19.  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;
• Host1 sends a segment with the ACK flag = 1, SYN flag = 0 to Host2;
• Host1 sends a segment with the ACK flag = 1, SYN flag = 1 to Host2;
• Host2 sends a segment with the ACK flag = 0, SYN flag = 1 to Host1;
• Host2 sends a segment with the ACK flag = 1, SYN flag = 0 to Host1;
• Host2 sends a segment with the ACK flag = 1, SYN flag = 1 to Host1.

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

• flow control;
• low overhead;
• connectionless;
• connection-oriented;
• sequence and acknowledgement

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