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New Released Free Update of Cisco 400-251 Exam Practice Materials in CertBus

CertBus 2018 Latest Cisco 400-251 CCIE Exam VCE and PDF Dumps for Free Download!

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Following 400-251 471QAs are all new published by Cisco Official Exam Center

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QUESTION 1

Which meaning of this error message on a Cisco ASA is true?

A. The route map redistribution is configured incorrectly.

B. The default route is undefined.

C. A packet was denied and dropped by an ACL.

D. The host is connected directly to the firewall.

Correct Answer: B


QUESTION 2

Which type of header attack is detected by Cisco ASA basic threat detection?

A. Connection limit exceeded.

B. Denial by access list.

C. Failed application inspection.

D. Bad packet format.

Correct Answer: D


QUESTION 3

Refer to the exhibit.

A user authenticates to the NAS, which communicates to the VACAS server authentication. The TACACS SERVER then accesses the Active Directory Server through the ASA firewall to validate the user credentials. Which protocol-Port pair must be allowed access through the ASA firewall?

A. SMB over TCP 455.

B. DNS over UDP 53.

C. LDAP over UDP 389.

D. global catalog over UDP 3268.

E. TACACS over TCP 49.

F. DNS over TCP 53.

Correct Answer: C


QUESTION 4

Which WEP configuration can be exploited by a weak IV attack?

A. When the static WEP password has been stored without encryption.

B. When a per-packet WEP key is in use.

C. When a 64-bit key is in use.

D. When the static WEP password has been given away.

E. When a 40-bit key is in use.

F. When the same WEP key is used to create every packet.

Correct Answer: E


QUESTION 5

Which two statements about Botnet Traffic Filter snooping are true?(Choose two)

A. It requires DNS packet inspection to be enabled to filter domain names in the dynamic database.

B. It requires the Cisco ASA DNS server to perform DNS lookups.

C. It can inspect both IPV4 and IPV6 traffic.

D. It can log and block suspicious connections from previously unknown bad domains and IP addresses.

E. It checks inbound traffic only.

F. It checks inbound and outbound traffic.

Correct Answer: A


Latest 400-251 Dumps400-251 Study Guide400-251 Exam Questions

QUESTION 6

Which three statements about SXP are true?(Choose three)

A. It resides in the control plane, where connections can be initiated from a listener.

B. Packets can be tagged with SGTs only with hardware support.

C. Each VRF supports only one CTS-SXP connection.

D. To enable an access device to use IP device tracking to learn source device IP addresses,DHCP snooping must be configured.

E. The SGA ZBPF uses the SGT to apply forwarding decisions.

F. SeparateVRFs require different CTS-SXP peers, but they can use the same source IP addresses.

Correct Answer: ABC


QUESTION 7

Which file extensions are supported on the Firesight Management Center 6.1(3.1) file policies that can be analyzed dynamically using the Threat Grid Sandbox integration?

A. MSEXE, MSOLE2, NEW-OFFICE,PDF;

B. DOCX, WAV,XLS,TXT

C. TXT, MSOLE2, WAV, PDF.

D. DOC, MSOLE2, XML, PF.

Correct Answer: A


QUESTION 9

Which effect of the crypto pki authenticate commend is true?

A. It sets the certificate enrollment method.

B. It retrievers and authentication a CA certificate.

C. It configures a CA trust point.

D. It displays the current CA certificate.

Correct Answer: B


QUESTION 10

Which effect of the ip nhrp map multicast dynamic command is true?

A. It configures a hub router to automatically add spoke routers to multicast replication list of the hub.

B. It enables a GRE tunnel to operate without the IPsec peer or crypto ACLs.

C. It enables a GRE tunnel to dynamically update the routing tables on the devices at each end of the tunnel.

D. It configures a hub router to reflect the routes it learns from a spoke back to other spoke back to other spokes through the same interface.

Correct Answer: A


QUESTION 11

Which statement about VRF-aware GDOI group members is true?

A. IPsec is used only to secure data traffic.

B. The GM cannot route control traffic through the same VRF as data traffic.

C. Multiple VRFs are used to separate control traffic and data traffic.

D. Registration traffic and rekey traffic must operate on different on different VRFs.

Correct Answer: A


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