Chapter 4 – Correct Answers
Which two options represent Layer 4 addressing? (Choose two.)
> identifies the communicating applications
> identifies multiple conversations between the hosts
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.
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.
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
> 0 to 1023
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
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
> transport
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
Why is flow control used for TCP data transfer?
> to prevent the receiver from being overwhelmed by incoming data
Which two options represent Layer 4 addressing? (Choose two.)
> identifies the communicating applications
> identifies multiple conversations between the hosts
Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?
> session establishment
What is dynamically selected by the source host when forwarding data?
> source port
What are two features of the User Datagram Protocol (UDP)? (Choose two.)
> low overhead
> connectionless
What mechanism is used by TCP to provide flow control as segments travel from source to destination?
> window size
Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?
> UDP
Which information is found in both the TCP and UDP header information?
> source and destination
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
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.
Which is an important characteristic of UDP?
> minimal delays in data delivery
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
Which event occurs during the transport layer three-way handshake?
> TCP initializes the sequence numbers for the sessions.
Exhibit item:
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.
