Free P4rs Cisco Certified Network Associate CCNA : 640-802 Exam

QUESTION 27:
Network equipment supporting the use of flow control mechanisms has been
recently installed in the Certkiller network. What is the purpose of flow control in a
data network?
A. It ensures that data is retransmitted if an acknowledgment is not received.
B. It reassembles segments in the correct order on the destination device.
C. It provides a mechanism for the receiver to control the transmission speed.
D. It regulates the size of each datagram segment.
E. All of the above are functions of flow control
Answer: C
Explanation:
Flow control paces the transmission of data between a sending device and a receiving
device. Flow control ensures that the receiving device can absorb the data sent to it
before the sending device sends more. When the buffers on the receiving device are full,
a message is sent to the sending device to suspend transmission until the data in the
buffers has been processed.
Incorrect Answers:
A. Data retransmission mechanisms are not handled by control. They are most often
handled by transport layer protocols such as TCP.
B. This describes the reassembly portion of the segmentation and reassembly (SAR)
function of network equipment.
D. The maximum transmission unit (MTU) handles the regulation of maximum frame
sizes.
QUESTION 28:
Part of the Certkiller network is displayed below:
Study the exhibit shown above. Host Certkiller A has established a connection with
the Certkiller II server attached to interface E0 of the Certkiller 2 router. Which of
the following statements describe the information contained in protocol data units
sent from Host Certkiller to Certkiller II? (Choose three)
A. The destination port number in a segment header will have a value of 80
B. The destination IP address of a packet will be the IP address of the E0 interface of the
Certkiller 1 router
C. The destination IP address of a packet will be the IP address of the network interface
of the Certkiller II server
D. The destination address of a frame will be the MAC address of the E0 interface of
Certkiller 1 router
Answer: A, C, D
QUESTION 29:
You have just installed a new web server on the Certkiller network. You are required
to ensure that the web server is accessible from the Internet. The network uses
private addressing, so an IP-to-registered address mapping is required.
To do this, you enter the following command:
Certkiller (config)# ip nat inside source static 192.168.2.1
198.18.1.254
You unsuccessfully try to ping the Internet from a PC host on the LAN. During the
troubleshooting process, you enter the “show ip nat translations” command but the
output is blank.
What is the most likely cause of the problem?
A. The keyword overload is missing from the command.
B. The NAT pool must be defined first.
C. An access list must be defined to create static NAT translations.
D. The interfaces must be configured for NAT.
E. None of the above
Answer: D

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Questions and Answers : 347 Q&As
Updated: 2008-08-11
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