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Home Cisco® 400-251

Cisco® 400-251 Exam Practice Questions (P. 3)

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Question #21
How does a DHCP client request its previously used IP address in a DHCP DISCOVER packet?
  1. A
    It is included in the CIADDR field.
  2. B
    It is included as DHCP Option 50 in the OPTIONS field.
  3. C
    It is included in the YIADDR field.
  4. D
    It is the source IP address of the UDP/53 wrapper packet.
  5. E
    The client cannot request its last IP address; it is assigned automatically by the server.

Correct Answer:
B

Question #22
Which two statements about an authoritative server in a DNS system are true? (Choose two.)
  1. A
    It indicates that it is authoritative for a name by setting the AA bit in responses.
  2. B
    It has a direct connection to one of the root name servers.
  3. C
    It has a ratio of exactly one authoritative name server per domain.
  4. D
    It cannot cache or respond to queries from domains outside its authority.
  5. E
    It has a ratio of at least one authoritative name server per domain.

Correct Answer:
AE

Question #23
Refer to the exhibit.

Which three statements are true? (Choose three.)
  1. A
    Because of a "root delay" of 0ms, this router is probably receiving its time directly from a Stratum 0 or 1 GPS reference clock.
  2. B
    This router has correctly synchronized its clock to its NTP master.
  3. C
    The NTP server is running authentication and should be trusted as a valid time source.
  4. D
    Specific local time zones have not been configured on this router.
  5. E
    This router will not act as an NTP server for requests from other devices.

Correct Answer:
BCE

Question #24
Which three security features were introduced with the SNMPv3 protocol? (Choose three.)
  1. A
    Message integrity, which ensures that a packet has not been tampered with in-transit
  2. B
    DoS prevention, which ensures that the device cannot be impacted by SNMP buffer overflow
  3. C
    Authentication, which ensures that the message is from a valid source
  4. D
    Authorization, which allows access to certain data sections for certain authorized users
  5. E
    Digital certificates, which ensure nonrepudiation of authentications
  6. F
    Encryption of the packet to prevent it from being seen by an unauthorized source

Correct Answer:
ACF

Question #25
Which common Microsoft protocol allows Microsoft machine administration and operates over TCP port 3389?
  1. A
    remote desktop protocol
  2. B
    desktop mirroring
  3. C
    desktop shadowing
  4. D
    Tarantella remote desktop

Correct Answer:
A

Question #26
To prevent a potential attack on a Cisco IOS router with the echo service enabled, what action should you take?
  1. A
    Disable the service with the no ip echo command.
  2. B
    Disable the service with the no echo command.
  3. C
    Disable tcp-small-servers.
  4. D
    Disable this service with a global access-list.

Correct Answer:
C

Question #27
Which query type is required for an nslookup on an IPv6 addressed host?
  1. A
    type=AAAA
  2. B
    type=ANY
  3. C
    type=PTR
  4. D
    type=NAME-IPV6

Correct Answer:
A

Question #28
In the context of a botnet, what is true regarding a command and control server?
  1. A
    It can launch an attack using IRC or Twitter.
  2. B
    It is another name for a zombie.
  3. C
    It is used to generate a worm.
  4. D
    It sends the command to the botnets via adware.

Correct Answer:
A

Question #29
Which option is used for anti-replay prevention in a Cisco IOS IPsec implementation?
  1. A
    session token
  2. B
    one-time password
  3. C
    time stamps
  4. D
    sequence number
  5. E
    nonce

Correct Answer:
D

Question #30

What will be the default action?
  1. A
    HTTP traffic to the Facebook, Youtube, and Twitter websites will be dropped.
  2. B
    HTTP traffic to the Facebook and Youtube websites will be dropped.
  3. C
    HTTP traffic to the Youtube and Twitter websites will be dropped.
  4. D
    HTTP traffic to the Facebook and Twitter websites will be dropped.

Correct Answer:
D

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