CCNA 200-125 Exam: IP Address Questions With Answers

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  1. Which two statements about IPv4 multicast traffic are true? (Choose two)
    • A. It burdens the source host without affecting remote hosts.
    • B. It uses a minimum amount of network bandwidth.*
    • C. It is bandwidth-intensive.
    • D. It simultaneously delivers multiple streams of data.
    • E. It is the most efficient way to deliver data to multiple receivers.*

    Show (Hide) Explanation/Reference
    IP multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to potentially thousands of corporate recipients and homes.

    IP multicast delivers application source traffic to multiple receivers without burdening the source or the receivers while using a minimum of network bandwidth.

    Reference: http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_ovr.html

  2. What are benefits of private IPv4 IP addresses?
    • A. They are routed the same as public IP addresses.
    • B. They are less costly than public IP addresses.*
    • C. They can be assigned to devices without Internet connections.*
    • D. They eliminate the necessity for NAT policies.
    • E. They eliminate duplicate IP conflicts.
  3. What will happen if a private IP address is assigned to a public interface connected to an ISP?
    • A. A conflict of IP addresses happens, because other public routers can use the same range.
    • B. Addresses in a private range will not be routed on the Internet backbone.*
    • C. Only the ISP router will have the capability to access the public network.
    • D. The NAT process will be used to translate this address to a valid IP address.
  4. Which destination IP address can a host use to send one message to multiple devices across different subnets?
    • A. 172.20.1.0
    • B. 127.0.0.1
    • C. 192.168.0.119
    • D. 239.255.0.1*

    Show (Hide) Explanation/Reference
    In order to send traffic to multiple devices (not all) across different subnets we need to use multicast addresses, which are in the range 224.0.0.0 through 239.255.255.255 -> D is correct.
  5. Which RFC was created to alleviate the depletion of IPv4 public addresses?
    • A. RFC 4193
    • B. RFC 1519
    • C. RFC 1518*
    • D. RFC 1918

    Show (Hide) Explanation/Reference
    The RFC 1518 is Classless Interdomain Routing (CIDR), which is created to save the IPv4 addresses because we can now assign IP addresses classless. Therefore, instead of assigning the whole block of a class B or C address, now smaller blocks of a class can be assigned. For example, instead of assigning a whole block of 200.1.45.0/24, a smaller block, like 200.1.45.0/27 or 200.1.45.32/27, can be assigned.

    The RFC 1918 is Address Allocation for Private Internets, which reserves IP addresses for private and internal use. These addresses can be used for networks that do not need to connect to the Internet.

    Therefore the RFC 1918 is the best choice to “alleviate the depletion of IPv4 public addresses”.

  6. Which IPv6 feature is supported in IPv4 but is not commonly used?
    • A. unicast
    • B. multicast
    • C. anycast*
    • D. broadcast

    Show (Hide) Explanation/Reference
    Only three connection types are commonly known and used in Internet Protocol version four (IPv4) networks: unicast, multicast and broadcast. A fourth connection type, Anycast, was unknown until IPv6 made it a standard connection type. Anycast is not standardized in IPv4 but can be emulated. IPv4 Anycast addressing is a good solution to provide localization for services and servers in order to obtain robustness, redundancy and resiliency.

    The basic idea of Anycast is very simple: multiple servers, which share the same IP address, host the same service. The routing infrastructure sends IP packets to the nearest server (according to the metric of the routing protocol used). The major benefits of employing Anycast in IPv4 are improved latency times, server load balancing, and improved security.

    Reference: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.116.6367&rep=rep1&type=pdf

  7. What are two benefits of private IPv4 IP addresses? (Choose two)
    • A. They are routed the same as public IP addresses.
    • B. They are less costly than public IP addresses.*
    • C. They can be assigned to devices without Internet connections.*
    • D. They eliminate the necessity for NAT policies.
    • E. They eliminate duplicate IP conflicts.

    Show (Hide) Explanation/Reference
    Usually using private IPv4 addresses in a organization is free so surely they are less costly than public IP addresses which you have to buy -> B is correct.

    Also we can use private IPv4 addresses to devices that do not need to connect to the Internet because Internet requires public IPv4 addresses -> C is correct.

    Answer D is not correct as we still need to use NAT policies to limit which private IPv4 addresses in our company can access our resources.

  8. What are two benefits of private IPv4 addresses? (Choose two)
    • A. they can be implemented without requiring admin to coordinate with IANA*
    • B. they are managed by IANA
    • C. increase the flexibility of network design
    • D. provide network isolation from the internet*
    • E. they are routable over internet
  9. Which address class includes network 191.168.0.1/27?
    • A. Class C
    • B. Class B*
    • C. Class D
    • D. Class A

    Show (Hide) Explanation/Reference
    This is a tricky question if you don’t have a close look on the network. The first octet is 191, not 192 so it belongs to class B, not class C.
  10. Which two options are the best reasons to use an IPV4 private IP space? (Choose two)
    • A. to enable intra-enterprise communication*
    • B. to conserve global address space*
    • C. to manage routing overhead
    • D. to connect applications
    • E. to implement NAT
  11. In which two circumstances are private IPv4 addresses appropriate? (Choose two)
    • A. on internal hosts that stream data solely to external resources
    • B. on hosts that communicates only with other internal hosts*
    • C. on the public-facing interface of a firewall
    • D. on hosts that require minimal access to external resources*
    • E. to allow hosts inside an enterprise to communicate in both directions with hosts outside the enterprise
  12. Which two statements are true for multicast MAC address directions?
    • A. 01:00:5E:xx:xx:xx*
    • B. one to one
    • C. 01 00 xx xxxxxxx
    • D. 02 xx xxxxxxx
    • E. one to many*

    Show (Hide) Explanation/Reference
    The Internet authorities have reserved the multicast address range of 01:00:5E:00:00:00 to 01:00:5E:7F:FF:FF for Ethernet and Fiber Distributed Data Interface (FDDI) media access control (MAC) addresses.

 


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