Category Archives: 400-251 Exam Questions

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NEW QUESTION 1
What is the best description of a docker file?

A.    Text document used to build an image.
B.    Message Daemon files.
C.    Software used to manage containers.
D.    Repository for docker images.

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NEW QUESTION 422
Which three statements about Dynamic ARP inspection on Cisco switches are true? (Choose three.)

A.    The trusted database can be manually configured using the CLI
B.    Dynamic ARP inspection is supported only on access ports
C.    Dynamic ARP inspection does not perform ingress security checking
D.    DHCP snooping is used to dynamically build the trusted database
E.    Dynamic ARP inspection checks ARP packets against the trusted database
F.    Dynamic ARP inspection checks ARP packets on trusted and untrusted ports

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NEW QUESTION 337
Which two statements about SCEP are true? (Choose two.)

A.    CA servers must support GetCACaps response messages in order to implement extended functionality.
B.    The GetCRL exchange is signed and encrypted only in the response direction.
C.    It is vulnerable to downgrade attacks on its cryptographic capabilities.
D.    The GetCert exchange is signed and encrypted only in the response direction.
E.    The GetCACaps response message supports DES encryption and the SHA-128 hashing algorithm.

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QUESTION 271
Which Cisco ASA firewall mode supports ASDM one-time-password authentication using RSA SecurID?

A.    Network translation mode
B.    Single-context routed mode
C.    Multiple-context mode
D.    Transparent mode

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QUESTION 241
Which Cisco product solution is designed for workload mobility between public-public and private-public clouds?

A.    Cisco Cloud Orchestrator
B.    Cisco Unified Cloud
C.    Cisco Intercloud Fabric
D.    Cisco Metapod

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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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