Saturday, August 20, 2011

ENetwork Chapter 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
Which information is found in both the TCP and UDP header information?
  •    source and destination port

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
With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?
  •     0 to 1023
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


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.

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.

What are two features of the User Datagram Protocol (UDP)? (Choose two.)
  •     low overhead
  •     connectionless
What is dynamically selected by the source host when forwarding data?
  •     source port

Why is flow control used for TCP data transfer?
  •     to prevent the receiver from being overwhelmed by incoming data
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.

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.

Which two options represent Layer 4 addressing? (Choose two.)
  •     identifies the communicating applications
  •     identifies multiple conversations between the hosts
Which event occurs during the transport layer three-way handshake?
  •     TCP initializes the sequence numbers for the sessions.
Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?
  •     transport

Which is an important characteristic of UDP?
  •     minimal delays in data delivery

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

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


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

1 komentar:

Anonymous said...

100% thanks alot! :D

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