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Testking cisco 640-821

Vendor: cisco
Exam Code: 640-821
Exam Name: Introduction to Cisco Networking Technologies (CCNA )
cisco 640-821 value pack
640-821 Q & A with Explanations + 640-821 Study Guide + Introduction to Cisco Networking Technologies

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QUESTION 6:
Cisco is the leader in the router market space. What basic functions do their routers
perform in a network? (Choose two)
A. The microsegmentation of broadcast domains
B. Path selection
C. Packet switching
D. Bridging between LAN segments
E. Access layer security
F. VLAN membership assignment
G. Application optimization
Answer: B, C
Explanation:
The primary functions of a router are: Packet Switching and Path Selection. It is the
routers job to determine the best method for delivering the data, and switching that data
as quickly as possible.
QUESTION 7:
Both bridges are switches are being used throughout the Certkiller LAN. Which of
the following statements are true regarding bridges and switches in this network?
(Choose 3)
A. Switches are primarily software based while bridges are hardware based.
B. Switches usually have a higher number of ports than most bridges.
C. Bridges are frequently faster than switches.
D. Bridges define broadcast domains while switches define collision domains.
E. Both bridges and switches forward Layer 2 broadcasts.
F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.
Answer: B, E, F
QUESTION 8:
As a network administrator, you will need to decide on the appropriate network
devices to use. Which of the following correctly describes the roles of devices in a
WAN? (Choose three)
A. A CSU/DSU terminates a digital local loop.
B. A router is commonly considered a DCE device.
C. A modem terminates an analog local loop.
D. A router is commonly considered a DTE device.
E. A modem terminates a digital local loop.
F. A CSU/DSU terminates an analog local loop.
G. A modem is used to terminate a T1
Answer: A, C, D
Explanation:
Layer 2 switching is considered hardware-based bridging because it uses specialized
hardware called an application-specific integrated circuit (ASIC). ASICs can run up to
gigabit speeds with very low latency rates.
Switches usually have higher port number then bridge. Generally bridges have two ports.
Both operates on Data link layer.
QUESTION 9:
The Certkiller network administrator needs to determine what LAN devices to
install on the Certkiller network. What are two advantages of using Layer 2
Ethernet switches over hubs? (Choose two)
A. Allowing simultaneous frame transmissions
B. Increasing the size of broadcast domains
C. Increasing the maximum length of UTP cabling between devices
D. Filtering frames based on MAC addresses
E. Decreasing the number of collision domains
Answer: A, D
QUESTION 10:
CDP is being used throughout the Certkiller network. What are two reasons why the
Certkiller network administrator would use CDP? (Choose two)
A. To determine the status of network services on a remote device
B. To obtain the IP Address of a connected device in order to telnet to the device
C. To verify the type of cable interconnecting two devices
D. To verify Layer 2 connectivity between two devices when Layer 3 fails
E. To obtain VLAN information from directly connected switches
F. To determine the status of the routing protocols between directly connected routers
G. To support automatic network failover during outages
Answer: B, D

Testking 640-821
Questions and Answers : 189 Q&As
Updated: 2008-12-05
Price: $99.99

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