Category Archives: 400-251 Practice Tests

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QUESTION 211
Refer to the exhibit. Which statement about the router R1 is true?

A.    Its private-config is corrupt.
B.    Its NVRAM contains public and private crypto keys.
C.    Its running configuration is missing.
D.    RMON is configured.

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QUESTION 181
What are two advantages of NBAR2 over NBAR? (Choose two.)

A.    Only NBAR2 support Flexible NetFlow for extracting and exporting fields from the packet header.
B.    Only NBAR2 allows the administrator to apply individual PDL files.
C.    Only NBAR2 support PDLM to support new protocals.
D.    Only NBAR2 can use Sampled NetFlow to extract pre-defined packet headers for reporting.
E.    Only NBAR2 supports custom protocols based on HTTP URLs.

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QUESTION 151
Which two statements about the SHA-1 algorithm are true? (Choose two.)

A.    The SHA-1 algorithm is considered secure because it always produces a unique hash for the same message.
B.    The SHA-1 algorithm takes input message of any length and produces 160-bit hash output.
C.    The SHA-1 algorithm is considered secure because it is possible to find a message from its hash.
D.    The purpose of the SHA-1 algorithm is to provide data confidentiality.
E.    The purpose of the SHA-1 algorithm is to provide data authenticity.

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QUESTION 121
The computer at 10.10.10.4 on your network has been infected by a botnet that directs traffic to a malware site at 168.65.201.120. Assuming that filtering will be performed on a Cisco ASA. What command can you use to block all current and future connections from the infected host?

A.    ip access-list extended BLOCK_BOT_OUT deny ip any host 10.10.10.4
B.    shun 10.10.10.4 168.65.201.120 6000 80
C.    ip access-list extended BLOCK_BOT_OUT deny ip host 10.10.10.4 host 168.65.201.120
D.    ip access-list extended BLOCK_BOT_OUT deny ip host 168.65.201.120 host 10.10.10.4
E.    shun 168.65.201.120 10.10.10.4 6000 80

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QUESTION 91
What are two method of preventing DoS attacks on your network? (Choose two.)

A.    Increase the ICMP Unreachable massage rate limit interval
B.    Implement shaping on the perimeter router
C.    Disable the ICMP Unreachable response on the loopback and Null0 interfaces
D.    Decrees the ICMP Unreachable massage interval
E.    Implement CWBQ on the perimeter router

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