Testking cisco 640-801
Vendor: cisco
Exam Code: 640-801
Exam Name: Interconnecting Cisco Networking Devices (CCNA )
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QUESTION 1:
Which of the following devices can an administrator use to segment their LAN?
(Choose all that apply)
A. Hubs
B. Repeaters
C. Switches
D. Bridges
E. Routers
F. Media Converters
G. All of the above
Answer: C, D, E
Explanation:
Switches and bridges forward broadcast but routers do not forward broadcasts by default
(they can via the “ip helper-address” command).
Switches, bridges and routers can segment an Ethernet collision domain via the use of
VLAN’s
Incorrect Answers:
A. Hubs is incorrect because a hub doesn’t segment a network, it only allows more hosts
on one. Hubs operate at layer one, and is used primarily to physically add more stations
to the LAN.
B. This also incorrect because the job of a repeater is to repeat a signal so it can exceed
distance limitations. It also operates at layer one and provides no means for logical LAN
segmentation.
F. This is incorrect because media converters work by converting data from a different
media type to work with the media of a LAN. It also operates at layer one and provides
no means for logical LAN segmentation.
QUESTION 2:
Routers perform which of the following functions? (Select Three)
A. Packet switching
B. Collision prevention on a LAN segment.
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internetwork communication
Answer: A, C, F
Explanation:
A. Routers work in Layer 3 of the OSI Model. A major function of the router is to route
packets between networks.
C. Through the use of access lists, routers can permit and deny traffic using layer 3 and
layer 4 packet information.
F. The primary purpose of a router is to route traffic between different networks,
allowing for internetworking.
Incorrect Answers:
B. While routers can be used to segment LANs, which will reduce the amount of
collisions; it can not prevent all collisions from occurring. As long as there are 2 or more
devices on a LAN segment, the possibility of a collision exists, whether a router is used
or not.
D. The broadcast domain of a LAN is often segmented through the use of a router. This
results in reducing the size of the broadcast domain.
E. Routers do not forward broadcast traffic.
QUESTION 3:
Within the Certkiller office, The Sales and Production networks are separated by a
router as shown in the diagram below:
Which of the following statements most accurately describes the characteristics of
the above networks broadcast and collision domains? (Select the two best answer
choices)
A. There are two broadcast domains in the network.
B. There are four broadcast domains in the network.
C. There are six broadcast domains in the network.
D. There are four collision domains in the network.
E. There are five collision domains in the network.
F. There are seven collision domains in the network.
Answer: A, F
Explanation:
In this network we have a hub being used in the Sales department, and a switch being
used in the Production department. Based on this, we have two broadcast domains: one
for each network being separated by a router. For the collision domains, we have 5
computers and one port for E1 so we have 6 collision domains total because we use a
switch in the Production Department so 5 are created there, plus one collision domain for
the entire Sales department because a hub is being used.
QUESTION 4:
The Certkiller corporate LAN consists of one large flat network. You decide to
segment this LAN into two separate networks with a router. What will be the affect
of this change?
A. The number of broadcast domains will be decreased.
B. It will make the broadcasting of traffic between domains more efficient between
segments.
C. It will increase the number of collisions.
D. It will prevent segment 1’s broadcasts from getting to segment 2.
E. It will connect segment 1’s broadcasts to segment 2.
Answer: D
Explanation
A router does not forward broadcast traffic. It therefore breaks up a broadcast domain,
reducing unnecessary network traffic. Broadcasts from one segment will not be seen on
the other segment.
Incorrect Answers:
A. This will actually increase the number of broadcast domains from one to two.
B. All link level traffic from segment one to segment two will now need to be routed
between the two interfaces of the router. Although this will reduce the traffic on the LAN
links, it does also provide a less efficient transport between the segments.
C. Since the network size is effectively cut into half, the number of collisions should
decrease dramatically.
E. Broadcasts from one segment will be completely hidden from the other segment.
QUESTION 5:
Which of the following are benefits of segmenting a network with a router? (Select
all that apply)
A. Broadcasts are not forwarded across the router.
B. All broadcasts are completely eliminated.
C. Adding a router to the network decreases latency.
D. Filtering can occur based on Layer 3 information.
E. Routers are more efficient than switches and will process the data more quickly.
F. None of the above.
Answer: A, D
Explanation
Routers do not forward broadcast messages and therefore breaks up a broadcast domain.
In addition, routers can be used to filter network information with the use of access lists.
Incorrect Answers:
B. Broadcasts will still be present on the LAN segments. They will be reduced, because
routers will block broadcasts from one network to the other.
C. Adding routers, or hops, to any network will actually increase the latency.
E. The switching process is faster than the routing process. Since routers must do a layer
3 destination based lookup in order to reach destinations, they will process data more
slowly than switches.
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Updated: 2008-12-01
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