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Home Cisco® 400-251

Cisco® 400-251 Exam Practice Questions (P. 1)

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Question #1
In an 802.11 WLAN, which option is the Layer 2 identifier of a basic service set, and also is typically the MAC address of the radio of the access point?
  1. A
    BSSID
  2. B
    SSID
  3. C
    VBSSID
  4. D
    MBSSID

Correct Answer:
A

Question #2
What term describes an access point which is detected by your wireless network, but is not a trusted or managed access point?
  1. A
    rogue
  2. B
    unclassified
  3. C
    interferer
  4. D
    malicious

Correct Answer:
A

Question #3
A router has four interfaces addressed as 10.1.1.1/24, 10.1.2.1/24, 10.1.3.1/24, and 10.1.4.1/24. What is the smallest summary route that can be advertised covering these four subnets?
  1. A
    10.1.2.0/22
  2. B
    10.1.0.0/22
  3. C
    10.1.0.0/21
  4. D
    10.1.0.0/16

Correct Answer:
C

Question #4
Which two address translation types can map a group of private addresses to a smaller group of public addresses? (Choose two.)
  1. A
    static NAT
  2. B
    dynamic NAT
  3. C
    dynamic NAT with overloading
  4. D
    PAT
  5. E
    VAT

Correct Answer:
CD

Question #5
Which authentication mechanism is available to OSPFv3?
  1. A
    simple passwords
  2. B
    MD5
  3. C
    null
  4. D
    IKEv2
  5. E
    IPsec AH/ESP

Correct Answer:
E

Question #6
Which two IPv6 tunnel types support only point-to-point communication? (Choose two.)
  1. A
    manually configured
  2. B
    automatic 6to4
  3. C
    ISATAP
  4. D
    GRE

Correct Answer:
AD

Question #7
Which two EIGRP packet types are considered to be unreliable packets? (Choose two.)
  1. A
    update
  2. B
    query
  3. C
    reply
  4. D
    hello
  5. E
    acknowledgement

Correct Answer:
DE

Question #8
Before BGP update messages may be sent, a neighbor must stabilize into which neighbor state?
  1. A
    Active
  2. B
    Idle
  3. C
    Connected
  4. D
    Established

Correct Answer:
D

Question #9
Which three statements are correct when comparing Mobile IPv6 and Mobile IPv4 support? (Choose three.)
  1. A
    Mobile IPv6 does not require a foreign agent, but Mobile IPv4 does.
  2. B
    Mobile IPv6 supports route optimization as a fundamental part of the protocol; IPv4 requires extensions.
  3. C
    Mobile IPv6 and Mobile IPv4 use a directed broadcast approach for home agent address discovery.
  4. D
    Mobile IPv6 makes use of its own routing header; Mobile IPv4 uses only IP encapsulation.
  5. E
    Mobile IPv6 and Mobile IPv4 use ARP for neighbor discovery.
  6. F
    Mobile IPv4 has adopted the use of IPv6 ND.

Correct Answer:
ABD

Question #10
Refer to the exhibit.

Which message could contain an authenticated initial_contact notify during IKE main mode negotiation?
  1. A
    message 3
  2. B
    message 5
  3. C
    message 1
  4. D
    none, initial_contact is sent only during quick mode
  5. E
    none, notify messages are sent only as independent message types

Correct Answer:
B

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