Testking cisco 642-831
Vendor: cisco
Exam Code: 642-831
Exam Name: CCNP’s Cisco Internetwork Troubleshooting (CIT) (CCNP )
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642-831 Q & A with Explanations + 642-831 Study Guide + 642-831 Preparation Labs
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Question: 6
Which two Cisco AutoQoS interface statements are true? (Choose two.)
A – AutoQoS is supported on Frame Relay multipoint subinterfaces.
B – AutoQoS is supported on low-speed ATM PVCs in point-to-point subinterfaces.
C – AutoQoS is supported on serial PPP and HDLC interfaces.
D – AutoQoS is supported only on Frame Relay main interfaces and not on any subinterface
configuration.
Answer: B, C
QUESTION 7
You have been tasked with setting up summarization in the Certkiller EIGRP
network. Which two statements are true about EIGRP manual summarization?
(Select two)
A. Manual summarization is configured on a per interface basis.
B. When manual summarization is configured, auto-summarization is automatically
disabled by default.
C. The summary address is assigned an administrative distance of 10 by default.
D. Manual summaries can be configured with the classful mask only.
E. The summary address is entered into the routing table and is shown to be sourced from
the Null0 interface.
Answer: A, E
Explanation:
EIGRP automatically summarizes routes at the classful boundary, the boundary where
the network address ends as defined by class-based addressing. In most cases, auto
summarization is a good thing, keeping the routing tables as compact as possible
In the presence of discontiguous subnetworks, automatic summarization must be disabled
for routing to work properly. To turn off auto-summarization, use the following
command:
Router(config-router)#no auto-summary
EIGRP also enables manual configuration of a prefix to use as a summary address.
Manual summary routes are configured on a per-interface basis. The interface that will
QUESTION 8:
The Certkiller Texas branch network is displayed in the following diagram:
Of the following choices, which IP address should be assigned to the PC host?
A. 192.168.5.5
B. 192.168.5.32
C. 192.168.5.40
D. 192.168.5.63
E. 192.168.5.75
Answer: C.
Explanation:
The subnet mask used on this Ethernet segment is /27, which translates to
255.255.255.224. Valid hosts on the 192.168.5.33/27 subnet are
192.168.5.33-192.168.5.62, with 192.168.5.32 used as the network IP address and
192.168.5.63 used as the broadcast IP address. Therefore, only choice C falls within the
usable IP range.
QUESTION 9:
The Certkiller .com network is displayed in the diagram below:
Based on the diagram above, how many collision domains are present in the
Certkiller .com network?
A. One
B. Two
C. Three
D. Four
E. Five
F. Six
G. Fourteen
Answer: B
Explanation:
Since hubs are being used for both Ethernet segments, there are a total of two collision
domains. Routers do not forward broadcast and are used to segment LANs, so Certkiller A
consists of one collision domain while Certkiller B consists of the second collision
domain.
Question: 10
Which two wireless security statements are true? (Choose two.)
A – A TACACS+ server is required to implement 802.1x.
B – MIC protects against man-in-the-middle and replay attacks.
C – The 802.1x standard provides encryption services for wireless clients.
D – The AES (symmetric block cipher) is specified in the IEEE 802.11i specification.
E – The IEEE 802.11i specification uses RC4 as its encryption mechanism.
F – WPA requires TKIP and AES as encryption methods.
Answer: B, D
Testking 642-831
Questions and Answers : 210 Q&As
Updated: 2008-12-06
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