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Following questions and answers are all new published by Cisco Official Exam Center: https://www.lead2pass.com/400-251.html

QUESTION 276
Refer to the exhibit. Which effect of this command is true?

 

A.    The current public key of the router is deleted from the cache when the router reboots, and the router generates a new one.
B.    The CA revokes the public key certificate of the router.
C.    The public key of the remote peer is deleted from the router cache.
D.    The router immediately deletes its current public key from the cache and generates a new one.
E.    The router sends a request to the CA to delete the router certificate from its configuration.

Answer: C

QUESTION 277
Refer to the exhibit. If you apply the given command to a Cisco device running IOS or IOS XE, which two statements about connections to the HTTP server on the device are true?(Choose two)

 

A.    The device will close each connection after 90 seconds even if a connection is actively processing a request.
B.    Connections will close after 60 seconds without activity or 90 seconds with activity.
C.    Connections will close after 60 seconds or as soon as the first request is processed.
D.    When you apply the command , the device will immediately close any existing connections that have been open for longer than 90 seconds.
E.    Connections will close after 60 seconds without activity or as soon as the first request is processed.

Answer: BE
Explanation:
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/https/configuration/12-2sy/https-12-2sy-book/nm-http-web.html

QUESTION 278
Which two statements about global ACLs are true? (Choose two)

A.    They support an implicit deny
B.    They are applied globally instead of being replicated on each interface
C.    They override individual interface access rules
D.    They require an explicit deny
E.    They can filer different packet types than extended ACLs
F.    They require class-map configuration

Answer: AB

QUESTION 279
What are two security controls you can implement to protect your organization’s network from virus and worm outbreak? (Choose two)

A.    Require users to authenticate before accessing the network
B.    Quarantine hosts that fail to meet your organization’s IT security requirements
C.    Implement Cisco identity service Engine (ISE. for network security
D.    Implement routing protocols with strong interface authentication
E.    Deploy Cisco prime LMS to manage network security

Answer: BC

QUESTION 280
Which two statement about DHCP snooping are true? (Choose two)

A.    The binding database stores information about trusted interface.
B.    Massages sent from outside the service-provider network are untrusted.
C.    The binding database stores information about both IP and MAC addresses.
D.    The lease time in the binding database is a pre-set value.
E.    DHCP servers connect to untrusted interface on the switch.

Answer: CD

QUESTION 281
Which command is required for bonnet filter on Cisco aASA to function properly?

A.    dynamic-filter inspect tcp/80
B.    dynamic-filter whitelist
C.    inspect botnet
D.    inspect dns dynamic-filter-snoop

Answer: D

QUESTION 282
What are three IPv6 extension headers? (Choose three)

A.    TTL
B.    source option
C.    Destination options
D.    Authentication
E.    Segment
F.    Hop-by-Hop options

Answer: CDF

QUESTION 283
What command specifies the peer from which MSDP SA message are accepted?

A.    IP msdpsa-filter in <peer>[list<acl>] [route-map <map> ]
B.    Ipmsdp default-peer <peer>
C.    Ipmsdp mesh-group
D.    Ipmsdp originator-id <interface>

Answer: B

QUESTION 284
Which two statements about the AES algorithm are true? (Choose two)

A.    The AES algorithm is an asymmetric block cipher.
B.    The AES algorithm operates on a 128-bits block.
C.    The AES algorithm uses a fixed length-key of 128 bits.
D.    The AES algorithm does not give any advantage over 3DES due to the same key length.
E.    The AES algorithm consist of four functions. Three functions provide confusion-diffusion and one provides encryption.

Answer: BE

QUESTION 285
Which feature can prevent IP spoofing attacks?

A.    CoPP
B.    CBAC
C.    ARP spoofing
D.    TCP Intercept
E.    Unicast RPF
F.    CAR

Answer: E

QUESTION 286
What technique can an attacker use to obfuscate a malware application payload, allowing it to bypass standard security mechanisms?

A.    Teredo tunnelling
B.    Decryption
C.    A PE32 header
D.    Steganography
E.    BASE64

Answer: E

QUESTION 287
Drag and Drop Question
Drag each EAP variant in the 802.1X framework on the left to the matching statement on the right.

 

Answer:

 
Explanation:
EAP-TLS clearly indicates server and client certificate authentication and both support fragmentation.
https://tools.ietf.org/html/rfc5216
https://tools.ietf.org/html/rfc5281
https://tools.ietf.org/html/rfc5281#page-22

QUESTION 288
Refer to the exhibit. What feature must be implemented on the network to produce the given output?

 

A.    PQ
B.    CQ
C.    WFQ
D.    NBAR
E.    CAR

Answer: D

QUESTION 289
Which two options are benefits of shortcut Switching Enhancements for NHRP on DMVPN networks? (Choose two)

A.    Its enables the NHRP FIB lookup process to perform route summarization on the hub.
B.    It allows data packets to be fast switched while spoke-to-spoke tunnels are being established.
C.    It is most beneficial with partial full-mesh DVMPN setup.
D.    It supports layered network topologies with the central hubs and direct spoke-to-spoke tunnels between spokes on different hubs.
E.    It enables spokes to use a summary route to build spoke-to-spoke tunnels.

Answer: DE
Explanation:
http://www.cisco.com/c/en/us/td/docs/ios/12_4t/12_4t11/ht_nhrp.html

QUESTION 290
Which two statements about the DES algorithm are true? (Choose two)

A.    The DES algorithm is based on asymmetric cryptography.
B.    The DES algorithm is a stream cipher.
C.    The DES algorithm is based on symmetric cryptography.
D.    The DES algorithm encrypts a block of 128 bits.
E.    The DES algorithm uses a 56-bit key.

Answer: CE

QUESTION 291
What are the two IPSec modes? (Choose two)

A.    Aggressive
B.    ISAKMP
C.    Transport
D.    IKE
E.    Main
F.    Tunnel

Answer: CF

QUESTION 292
Which two options are unicast address types for IPv6 addressing? (Choose two)

A.    Established
B.    Static
C.    Global
D.    Dynamic
E.    Link-local

Answer: CE

QUESTION 293
What are the two technologies that support AFT? (Choose two)

A.    SNAT
B.    NAT -6to4
C.    DNAT
D.    NAT -PT
E.    NAT -PMP
F.    NAT64

Answer: DF

QUESTION 294
Refer to the Exhibit. which service or feature must be enabled on 209.165.200.255 produce the given output?

 

A.    The finger service
B.    A BOOTp server
C.    A TCP small server
D.    The PAD service

Answer: C

QUESTION 295
Drag and Drop Question
Drag each step in the configuration of flexiblenetflow IPv6 traffic Unicast flows on the left into the Correct order of operation on the right.

 

Answer:

 

Explanation:
The order of Flexible Netflow configuration consists of this steps:
1) Configure the “flow exporter” first and then configure “flow record” or vice versa.
2) Configure “flow monitor” by associating it with “flow exporter” and “flow records”
3) Apply “flow monitor” to the interface

QUESTION 296
You want to allow existing network hardware (which is not part of the ACI infrastructure) to be governed by the APIC, by installing device packages.
Where must these packages be installed?

A.    On the connecting leaf switches
B.    On the APIC
C.    On the network element you are adding
D.    On all devices on the path

Answer: B
Explanation:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/aci/apic/sw/1-x/L4-L7_Services_Deployment/guide/b_L4L7_Deploy/b_L4L7_Deploy_chapter_011.html#concept_E667635DE53D40E5B4E3225BEC5DE1A8

QUESTION 297
What are three QoS features supported on the ASA running version 8.x? (Choose Three)

A.    Traffic shaping and standard priority queuing on the same interface.
B.    IPSec-over-TCP priority queuing.
C.    Traffic shaping within the class-default class map only.
D.    Priority queuing.
E.    Traffic shaping within any class map.
F.    Traffic policing.

Answer: CDF

QUESTION 298
What IOS feature can prevent header attacks by using packet-header information to classify traffic?

A.    CAR
B.    FPM
C.    TOS
D.    LLQ
E.    TTL

Answer: B

QUESTION 299
Which two statement about MLD version 2 on the ASA are true? (Choose two)

A.    It allows the ASA to function as a multicast router.
B.    It enables the ASA to discover multicast address listeners on attached and remote links.
C.    It discover other multicast address listeners by listening to multicast listener reports.
D.    It enables the ASA to discover multicast address listeners to attached links only.
E.    It sends multicast listener reports in response to multicast listener quires.

Answer: DE

QUESTION 300
Which three types of addresses can be Botnet Traffic Filter feature of the Cisco ASA monitor?(Choose three)

A.    Dynamic addresses.
B.    Known malware addresses
C.    Known allowed addresses
D.    Ambiguous addresses
E.    Internal addresses
F.    Listed addresses

Answer: BCD

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