ENetwork Chapter 4

1
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

   
2   
Which information is found in both the TCP and UDP header information?

•    source and destination port

3   
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

   
4   
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?

•     0 to 1023

   
5   
Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? (Choose three.)

•     flow control
•     session establishment
•     numbering and sequencing

6  

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.

   
7   

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.

8   
What are two features of the User Datagram Protocol (UDP)? (Choose two.)

•     low overhead
•     connectionless

   
9   
What is dynamically selected by the source host when forwarding data?

•     source port

10   
Why is flow control used for TCP data transfer?

•     to prevent the receiver from being overwhelmed by incoming data

   
11   
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.

   
12   

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?

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

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

•     identifies the communicating applications
•     identifies multiple conversations between the hosts

   
14   
Which event occurs during the transport layer three-way handshake?

•     TCP initializes the sequence numbers for the sessions.

   
15   
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?

•     transport

16   
Which is an important characteristic of UDP?

•     minimal delays in data delivery

17   
What mechanism is used by TCP to provide flow control as segments travel from source to destination?

•     window size

18   
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?

•     UDP

19   
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

20   

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

•     session establishment

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