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46.
Which of the following is the primary method for transmitting IPv6 traffic over an IPv4 network?
  • A.
    Subnetting
  • B.
    Tunneling
  • C.
    Supernetting
  • D.
    Contracting
  • Answer & Explanation
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Answer : [B]
Explanation :
A. Incorrect: Subnetting is a technique for creating administrative divisions on a network; it does not transmit IPv6 traffic over an IPv4 network.
B. Correct: Tunneling is a method for encapsulating IPv6 traffic within IPv4 datagrams.
C. Incorrect: Supernetting is a method for combining consecutive subnets into a single entity.
D. Incorrect: Contracting is a method for shortening IPv6 addresses.
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47.
Which of the following is the IPv6 equivalent to a private IPv4 address?
  • A.
    Link-local unicast address
  • B.
    Global unique unicast address
  • C.
    Unique local unicast address
  • D.
    Anycast address
  • Answer & Explanation
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Answer : [C]
Explanation :
A. Incorrect: Link-local unicast addresses are self-assigned by IPv6 systems. They are therefore the equivalent of APIPA addresses on IPv4.
B. Incorrect: A global unicast address is the equivalent of a registered IPv4 address, routable worldwide and unique on the Internet.
C. Correct: Unique local unicast addresses are the IPv6 equivalent of the 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 private network addresses in IPv4.
D. Incorrect: The function of an anycast address is to identify the routers within a given address scope and send traffic to the nearest router.
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48.
Which of the following is an automatic tunneling protocol used by Windows operating systems that are located behind NAT routers?
  • A.
    Teredo
  • B.
    6to4
  • C.
    ISATAP
  • D.
    APIPA
  • Answer & Explanation
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Answer : [A]
Explanation :
A. Correct: Teredo is a mechanism that enables devices behind non-IPv6 NAT routers to function as tunnel endpoints.
B. Incorrect: 6to4 incorporates the IPv4 connections in a network into the IPv6 infrastructure by defining a method for expressing IPv4 addresses in IPv6 format and encapsulating IPv6 traffic into IPv4 packets.
C. Incorrect: Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) is an automatic tunneling protocol used by the Windows workstation operating systems that emulates an IPv6 link using an IPv4 network.
D. Incorrect: APIPA is an automatic IPv4 address self-assignment process. It has nothing to do with tunneling.
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49.
Which type of IP address must a system have to be visible from the Internet?
  • A.
    Registered
  • B.
    Binary
  • C.
    Class B
  • D.
    Subnetted
  • Answer & Explanation
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Answer : [A]
Explanation :
A. Correct: For an address to be visible from the Internet, it must be registered with the IANA.
B. Incorrect: Binary is a system of numbering that can be used to express any IP address.
C. Incorrect: All address classes can be visible or invisible to the Internet.
D. Incorrect: Subnetted addresses can be visible or invisible to the Internet.
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50.
Which of the following subnet mask values would you use when configuring a TCP/IP client with an IPv4 address on the 172.16.32.0/19 network?
  • A.
    255.224.0.0
  • B.
    255.240.0.0
  • C.
    255.255.224.0
  • D.
    255.255.240.0
  • E.
    255.255.255.240
  • Answer & Explanation
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Answer : [C]
Explanation :
A. Incorrect: In binary form, the mask 255.224.0.0 is 11111111.11100000.00000000. 00000000, which contains only 11 network identifier bits.
B. Incorrect: In binary form, the mask 255.240.0.0 is 11111111.11110000.00000000. 00000000, which contains only 12 network identifier bits.
C. Correct: In binary form, the mask 255.255.224.0 is 11111111.11111111.11100000. 00000000, which contains 19 network identifier bits.
D. Incorrect: In binary form, the mask 255.255.240.0 is 11111111.11111111.11110000. 00000000, which contains 20 network identifier bits.
E. Incorrect: In binary form, the mask 255.255.255.240 is 11111111.11111111. 11111111.11110000, which contains 28 network identifier bits.
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