martes, 1 de septiembre de 2009

Examen cisco CCNA1 CAPITULO 4

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 well-known port numbers to identify the source ports.
* A termination request has been sent to
Communication with is using HTTP Secure.
* The local computer is accepting HTTP requests. is performing the three-way handshake with

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 information is found in both the TCP and UDP header information?
flow control
* acknowledgments
source and destination

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

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

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

Refer to the exhibit. The initial TCP exchange of data between two hosts is shown in the exhibit. Assuming an initial sequence number of 0, what sequence number will be included in Acknowledgment 2 if Segment 6 is lost?
* 1850

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

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.

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

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

What are two features of the User Datagram Protocol (UDP)? (Choose two.)
* flow control
* low overhead
sequence and acknowledgements

What mechanism is used by TCP to provide flow control as segments travel from source to destination?
sequence numbers
session establishment
* window size

What is dynamically selected by the source host when forwarding data?
destination logical address
source physical address
default gateway address
* source port

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

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

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

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

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.

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.
to f it devices the best path through the network
to identify the source and destination end devices that are communicating
* to identify the processes or services that are communicating within the end devices

Select the statements that are correct concerning network protocols. (Choose three.)
* define the structure of layer specific PDU's
dictate how to accomplish layer functions
* outline the functions necessary for communications between layers
limit hardware compatibility
* require layer dependent encapsulations
eliminate standardization among vendors 

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