Cisco 400-251 Practice Exam Material 400-251 Best Exam Result 2018

The 400-251 CCIE Security written exam validates experts who have the knowledge and skills to architect, engineer, implement, troubleshoot, and support the full suite of Cisco security technologies and solutions using the latest industry best practices to secure systems and environments against modern security risks, threats, vulnerabilities, and requirements.

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Question: 1

A server with IP address 209.165.202.150 is protected behind the inside interface of a Cisco ASA and the Internet on the outside interface. User on the Internet need to access the server ay any time, but the firewall administrator does not want to apply NAT to the address of the server because it is currently a public address. Which three of the following commands can be used to accomplish this? (Choose three.)

A. static (outside, inside) 209.165.202.150.209.165.202.150 netmask 255.255.255.255

B. nat (inside) 1 209.165.202.150 255.255.255.255

C. static (inside, outside) 209.165.202.150.209.165.202.150 netmask 255.255.255.255

D. no nat-control

E. access-list no-nat permit ip host 209.165.202.150 any

nat (inside) 0 access-list no-nat

F. nat (inside) 0 209.165.202.150 255.255.255.255

Answer: CEF

Question: 2

Which statement about the Cisco AMP Virtual Private Cloud Appliance is true for deployments in air-gap

mode?

A. The amp-sync tool syncs the threat-intelligence repository on the appliance directly with the AMP public cloud.

B. The appliance can perform disposition lookup against either the Protect DB or the AMP public cloud.

C. The appliance can perform disposition lookups against the Protect DB without an Internet connection.

D. The appliance evaluates files against the threat intelligence and disposition information residing on the Update Host.

E. The Update Host automatically downloads updates and deploys them to the Protect DB on a daily basis.

Answer: C

Question: 3

What are the most common methods that security auditors use to access an organization’s security

processes? (Choose two.)

A. physical observation

B. social engineering attempts

C. penetration testing

D. policy assessment

E. document review

F. interviews

Answer: AF

Question: 4

Which two statements about Cisco AMP for Web Security are true? (Choose two.)

A. It can prevent malicious data exfiltration by blocking critical files from exiting through the Web gateway.

B. It can perform reputation-based evaluation and blocking by uploading the fingerprint of incoming files to a cloud-based threat intelligence network.

C. It can detect and block malware and other anomalous traffic before it passes through the Web gateway.

D. It can perform file analysis by sandboxing known malware and comparing unknown files to a local

repository of the threats.

E. It can identify anomalous traffic passing through the Web gateway by comparing it to an established of expected activity.

F. It continues monitoring files after they pass the Web gateway.

Answer: BF

Question: 5

Which three statements about WCCP are true? (Choose three.)

A. The minimum WCCP-Fast Timers messages interval is 500 ms

B. Is a specific capability is missing from the Capabilities Info component, the router is assumed to support the default capability

C. If the packet return method is missing from a packet return method advertisement, the web cache uses the Layer 2 rewrite method

D. The router must receive a valid receive ID before it negotiates capabilities

E. The assignment method supports GRE encapsulation for sending traffic

F. The web cache transmits its capabilities as soon as it receives a receive ID from router

Answer: ACE

Explanation:

Web Cache Communication Protocol (WCCP)

http://www.cisco.com/c/en/us/td/docs/security/asa/special/wccp/guide/asa-wccp.html

Question: 6

What are two features that helps to mitigate man-in-the-middle attacks? (Choose two.)

A. DHCP snooping

B. ARP spoofing

C. destination MAC ACLs

D. dynamic ARP inspection

E. ARP sniffing on specific ports

Answer: AD

Question: 7

Which two statements about 6to4 tunneling are true? (Choose two.)

A. It provides a /128 address block.

B. It supports static and BGPV4 routing.

C. It provides a /48 address block.

D. It supports managed NAT along the path of the tunnel.

E. The prefix address of the tunnel is determined by the IPv6 configuration of the interface.

F. It supports multihoming.

Answer: BC

Question:8

Which three statements about RLDP are true? (Choose three.)

A. It detects rogue access points that are connected to the wired network.

B. It can detect rogue APs that use WPA encryption.

C. It can detect rogue APs operating only on 5 GHz.

D. It can detect rogue APs that use WEP encryption.

E. The AP is unable to serve clients while the RLDP process is active.

F. Active Rogue Containment can be initiated manually against rogue devices detected on the wired

network.

Answer: AEF

Explanation:

Rogue Location Discovery Protocol (RLDP)

http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/70987-rogue-detect.html

Question: 9

What are three features that are enabled by generating Change of Authorization (CoA) requests in a push

model? (Choose three.)

A. session reauthentication

B. session identification

C. host reauthentication

D. MAC identification

E. session termination

F. host termination

Answer: BCE

Question: 10

Which two statements about a wireless access point configured with the guest-mode command are true?

(Choose two.)

A. It can support more than one guest-mode SSID.

B. It supports associations by clients that perform passive scans.

C. It allows clients configured without SSIDs to associate.

D. It allows associated clients to transmit packets using its SSID.

E. If one device on a network is configure in guest-mode, clients can use the guest-mode SSID to connect

to any device in the same network.

Answer: BC

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