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Interconnecting Cisco Networking Devices Part 1 : 640-822 Exam

Exam Number/Code: 640-822
Exam Name: Interconnecting Cisco Networking Devices Part 1

“Interconnecting Cisco Networking Devices Part 1″, also known as 640-822 exam, is a Cisco certification.
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With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 112 Q&As to your 640-822 Exam preparation. In the 640-822 exam resources, you will cover every field and category in CCNA helping to ready you for your successful Cisco Certification.

QUESTION 41:
The corporate head office of PassGuide 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
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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 42:
Part of the PassGuide network is shown below:
You work as a network technician for PassGuide 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.
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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 43:
You work as a network technician at PassGuide .com. You have been assigned the
task of designing a new PassGuide internetwork. The main priority is to achieve the
highest reliability available. PassGuide .com is willing to spend more dollars to avoid
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downtime caused by link failure.
Which of the following four designs is to be preferred?
A. Design PassGuide A
B. Design PassGuide B
C. Design PassGuide C
D. Design PassGuide D
Answer: A
Explanation:
A network topology that is set up so that each device is directly connected to every other
device on the network. This connection method has built-in redundancy. If one link goes
down, the device will transmit via another link.
Example: If the partial mesh design is a compromise between the network administrators
and managers, then the full mesh design implies that the network administrators won.
This design is every Cisco network administrator’s picture of perfection over a Frame
Relay cloud. It gives every site a direct virtual circuit to every other site, as shown in
Figure This design gives maximum redundancy and minimum packet latency (latency
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describes how long it takes a packet to reach each location).
QUESTION 44:
You work as a network technician at PassGuide .com. You have been assigned the
task of designing a new PassGuide internetwork. The main priority is the achieve the
highest reliability available, however not at all costs. PassGuide .com is willing to
spend more dollars to avoid downtime caused by link failure.
Which of the following four designs would provide some redundancy and increase
reliability for all four sites, but would cost less than a fully redundant topology?
A. Design PassGuide A
B. Design PassGuide B
C. Design PassGuide C
D. Design PassGuide D
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Answer: B
Explanation:
You can think of the partial mesh Frame Relay design as the compromise between
network administrators and cost-saving managers.
Example:
QUESTION 45:
You work as a network technician at PassGuide .com. You have been assigned the
task of designing a new PassGuide internetwork. The main priority is to minimize the
link costs and at the same time wants to ensure the branch offices have direct
connectivity to the main site.
Which of the following four designs is to be preferred?
A. Design PassGuide A
B. Design PassGuide B
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C. Design PassGuide C
D. Design PassGuide D
Answer: C