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Cisco Certified Network Associate : 640-802 Exam latest new vesion

Exam Number/Code: 640-802
Exam Name: Cisco Certified Network Associate

“Cisco Certified Network Associate”, also known as 640-802 exam, is a Cisco certification.
Preparing for the 640-802 exam? Searching 640-802 Test Questions, 640-802 Practice Exam, 640-802 Dumps?

With the complete collection of questions and answers, Pass4sure has assembled to take you through 254 Q&As to your 640-802 Exam preparation. In the 640-802 exam resources, you will cover every field and category in CCNA helping to ready you for your successful Cisco Certification.

QUESTION 48:
The corporate head office of Certkiller has a teleconferencing system that uses VOIP
(voice over IP) technology. This system uses UDP as the transport for the data
transmissions. If these UDP datagrams arrive at their destination out of sequence,
what will happen?
A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order
that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in
the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the
datagrams.
Answer: B
Explanation:
VOIP systems utilize UDP because it is faster and uses less overhead. In addition, the
reliable transport mechanism used in TCP is useless to VOIP because if a packet gets
dropped and needs to be resent, it will be already too late.
UDP provides a service for applications to exchange messages. Unlike TCP, UDP is
connectionless and provides no reliability, no windowing, and no reordering of the
received data. However, UDP provides some functions of TCP , such as data transfer,
segmentation, and multiplexing using port numbers, and it does so with fewer bytes of
overhead and with less processing required. UDP data transfer differs from TCP data
transfer in that no reordering or recovery is accomplished. Applications that use UDP are
tolerant of lost data, or they have some application mechanism to recover data loss.
Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press,
ISBN 1-58720-094-5) Page 161.
QUESTION 49:
Part of the Certkiller network is shown below:

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You work as a network technician for Certkiller and are responsible for this
network. Based on the diagram shown above, how many collision domains are
there?
A. Six
B. Fourteen
C. Four
D. Two
E. Three
F. One
G. Eight
Answer: D
Explanation:
The multi-segment configuration guidelines apply only to a single Ethernet “collision
domain.” A collision domain is formally defined as a single CSMA/CD network in which
there will be a collision if two computers attached to the system transmit at the same
time. An Ethernet system composed of a single segment or multiple segments linked with
repeaters is a network that functions as a single collision domain.
FIGURE 1 Repeater hubs create a single collision domain
The figure shows two repeater hubs connecting three computers. Since only repeater
connections are used between segments in this network, all of the segments and
computers are in the same collision domain.
In the next figure, the repeaters and DTEs are instead separated by a router (packet
switch) and are therefore in separate collision domains, since routers do not forward
collision signals from one segment to another. Routers contain multiple Ethernet
interfaces and are designed to receive a packet on one Ethernet port and transmit the data
onto another Ethernet port in a new packet.
FIGURE 2 Routers creates separate collision domains
Instead of propagating collision signals between Ethernet segments, routers interrupt the
collision domain and allow the Ethernets they link to operate independently. Therefore,
you can use packet switching hubs to build larger network systems by interconnecting
individual Ethernet systems.
QUESTION 50:
You work as a network technician at Certkiller .com. You have been assigned the
task of designing a new Certkiller internetwork. The main priority is to achieve the
highest reliability available. Certkiller .com is willing to spend more dollars to avoid
downtime caused by link failure.
Which of the following four designs is to be preferred?
A. Design Certkiller A
B. Design Certkiller B
C. Design Certkiller C
D. Design Certkiller D
Answer: A

Questons and Answers : 254 Q&As
Updated: 3/12/2008

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