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100% Pass Ensure 400-251 Dumps with Free VCE and PDF (Question 271 – Question 300)

New 400-251 exam questions from PassLeader 400-251 dumps! Welcome to download the newest PassLeader 400-251 VCE and PDF dumps: http://www.passleader.com/400-251.html (791 Q&As — 2019 NEW VERSION!!!)

P.S. Free 400-251 dumps are available on Google Drive shared by PassLeader: https://drive.google.com/open?id=0B-ob6L_QjGLpd3JLalNVS0VWbms

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

Answer: B

What protocol is responsible for issuing certificates?

A.    SCEP
B.    DTLS
C.    ESP
D.    AH
E.    GET

Answer: A

Which category to protocol mapping for NBAR is correct?

A.    Category: internet
Protocol: FTP, HTTP, TFTP
B.    Category: Network management
Protocol: ICMP, SNMP, SSH, telent
C.    Category: network mail services
Protocol: mapi, pop3, smtp
D.    Category: Enterprise applications
Protocal: citrixICA, PCAnywhere, SAP, IMAP

Answer: A

You have discovered unwanted device with MAC address 001c.0f12.badd on port FastEthernet1/1 on VLAN 4. What command or command sequence can you enter on the switch to prevent the MAC address from passing traffic on VLAN 4?

Answer: D

Which two options are benefits of the Cisco ASA Identity Firewall? (Choose two.)

A.    It can apply security policies on an individual user or user-group basis
B.    It can identify threats quickly based on their URLs
C.    It can operate completely independently of other services
D.    It decouples security policies from the network topology
E.    It supports an AD server module to verify identity data

Answer: AD

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

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: CE

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

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

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

Which three statements about Unicast RPF in strict mode and loose mode are true? (Choose three.)

A.    Inadvertent packet loss can occur when loose mode is used with asymmetrical routing.
B.    Strict mode requires a default route to be associated with the uplink network interface.
C.    Both loose and strict modes are configured globally on the router.
D.    Loose mode requires the source address to be present in the routing table.
E.    Strict mode is recommended on interfaces that will receive packets only form the same subnet to which the interface is assigned.
F.    Interfaces in strict mode drop traffic with return routes that point to the NULL 0 interface.

Answer: DEF

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

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

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

Which feature can prevent IP spoofing attacks?

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

Answer: E

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

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


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

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: BE

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

What are the two IPSec modes? (Choose two.)

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

Answer: CF

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

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

Refer to the Exhibit. Which service or feature must be enabled on produce the given output?

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

Answer: C

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.


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: A

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

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

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

Which two characteristics of DTLS are true? (Choose two.)

A.    It includes a congestion control mechanism
B.    It supports long data transfers and connections data transfers
C.    It completes key negotiation and bulk data transfer over a single channel
D.    It is used mostly by applications that use application layer object-security protocols
E.    It includes a retransmission method because it uses an unreliable datagram transport
F.    It cannot be used if NAT exists along the path

Answer: AE

New 400-251 exam questions from PassLeader 400-251 dumps! Welcome to download the newest PassLeader 400-251 VCE and PDF dumps: http://www.passleader.com/400-251.html (791 Q&As — 2019 NEW VERSION!!!)

P.S. Free 400-251 dumps are available on Google Drive shared by PassLeader: https://drive.google.com/open?id=0B-ob6L_QjGLpd3JLalNVS0VWbms