Supernetting and CIDR Basics
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Supernetting and CIDR Basics

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Questions and Answers

What is the total number of usable host addresses obtained from eight Class C networks configured with CIDR /21?

  • 2048
  • 256
  • 2046 (correct)
  • 255

    • Which starting address satisfies the Supernetting rules for the provided Class C networks?

  • 192.168.17.0
  • 192.168.16.0 (correct)
  • 192.168.15.0
  • 192.168.18.0

    • In the Supernetting plan, which of the following networks has the last address unavailable?

  • 192.168.16.0
  • 192.168.19.0
  • 192.168.22.0
  • 192.168.23.0 (correct)

    • What is one of the primary issues that CIDR helps to address?

    <p>Running out of IP addresses</p> Signup and view all the answers

    Which statement is true regarding the usage of CIDR compared to the traditional Class A, B, and C addressing schemes?

    <p>CIDR allows for more efficient allocation of IP addresses.</p> Signup and view all the answers

    Which of the following describes the function of CIDR in terms of routing tables?

    <p>It reduces the size of routing tables.</p> Signup and view all the answers

    What does CIDR allow in terms of address block assignment?

    <p>It allows for administrative assignment of large address blocks.</p> Signup and view all the answers

    What are the two key issues that necessitated the development of CIDR?

    <p>Running out of IP addresses and capacity in global routing tables.</p> Signup and view all the answers

    Which of the following statements about supernetting is true?

    <p>The first address of a supernet and its mask define the address range.</p> Signup and view all the answers

    What is the supernet mask for a network requiring 16 class C addresses?

    <p>255.255.255.240</p> Signup and view all the answers

    If a supernet has a first address of 205.16.32.0 and a supernet mask of 255.255.248.0, how many blocks are in the supernet?

    <p>8</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a supernet?

    <p>It uses more bits for the subnet mask than the default.</p> Signup and view all the answers

    When an organization needs 2000 addresses, what is the minimum number of class C addresses required for supernetting?

    <p>16</p> Signup and view all the answers

    In the context of supernetting, what does a default mask of 255.255.255.0 indicate?

    <p>It allows for up to 256 addresses.</p> Signup and view all the answers

    Which option correctly lists attributes related to subnetting?

    <p>Less 1s than defaults, dividing networks.</p> Signup and view all the answers

    Which of the following options is a valid range of addresses for a supernet with a mask of 255.255.248.0 and a first address of 205.16.32.0?

    <p>205.16.32.0 to 205.16.39.255</p> Signup and view all the answers

    What is the main purpose of supernetting?

    <p>To conserve IP address space and reduce Internet Routing table size.</p> Signup and view all the answers

    Which of the following is NOT a rule associated with supernetting?

    <p>The Class C blocks must have at least one address gap between them.</p> Signup and view all the answers

    What size is a typical Class C address block?

    <p>256 addresses.</p> Signup and view all the answers

    How many entries would a routing table have if Class C addresses are assigned randomly?

    <p>As many entries as there are Class C blocks.</p> Signup and view all the answers

    If a company needs 600 addresses, which of the following scenarios satisfies supernetting rules?

    <p>Using 32 Class C blocks.</p> Signup and view all the answers

    What does CIDR stand for in the context of IP addressing?

    <p>Classless Inter-Domain Routing.</p> Signup and view all the answers

    What is a significant drawback of supernetting?

    <p>Historically, it is now considered an obsolete technique.</p> Signup and view all the answers

    Which statement accurately describes the third byte condition in supernetting?

    <p>It must be evenly divisible by the number of Class C blocks.</p> Signup and view all the answers

    What is the primary purpose of the CIDR procedure in relation to IP addresses?

    <p>Restructure IP address assignments for efficiency</p> Signup and view all the answers

    How does hierarchical routing aggregation benefit routing tables?

    <p>It minimizes the entries in the routing table</p> Signup and view all the answers

    Which entity issues large, short-prefix CIDR blocks to regional Internet registries?

    <p>Internet Assigned Numbers Authority (IANA)</p> Signup and view all the answers

    What is the range of prefix lengths currently used by CIDR?

    <p>13 to 27 bits</p> Signup and view all the answers

    What does the /25 in the CIDR address 206.13.01.48/25 indicate?

    <p>First 25 bits are used for the network prefix</p> Signup and view all the answers

    What is the result of route summarization in network routing?

    <p>Reduces the number of routes maintained by a router</p> Signup and view all the answers

    What type of blocks do larger ISPs control in the CIDR administration process?

    <p>Short-prefix blocks</p> Signup and view all the answers

    How are subnet blocks created in the standard subnetting procedure?

    <p>By allowing the ISP to choose its mask length</p> Signup and view all the answers

    What summarizes the networks 172.31.20.0/24 to 172.31.24.0/24 into a single address?

    <p>172.31.16.0/20</p> Signup and view all the answers

    In classless addressing, how many columns are needed in a routing table compared to classful addressing?

    <p>Four columns</p> Signup and view all the answers

    Which statement describes the difference between inclusive summary and exclusive summary?

    <p>Inclusive summary includes all addresses, while exclusive summary excludes all except one.</p> Signup and view all the answers

    What is the longest prefix match used for in routing?

    <p>To ignore shorter prefixes and select longer ones.</p> Signup and view all the answers

    Given the addresses 192.168.1.160/30, 192.168.1.164/29, 192.168.1.172/29, and 192.168.1.180/30, can they be summarized?

    <p>No, they represent non-contiguous addresses.</p> Signup and view all the answers

    What occurs if an organization changes its connection from R1 to R4?

    <p>The organization will assume a new address block.</p> Signup and view all the answers

    Which of the following is NOT a similarity between CIDR and VLSM?

    <p>Both require static routing.</p> Signup and view all the answers

    What is the binary equivalent of the address 172.31.21.0/24 focusing on the third octet?

    <p>0001 0101</p> Signup and view all the answers

    Study Notes

    Supernetting

    • A method to combine multiple class C network address blocks into a single, larger network address block.
    • Supernetting aims to reduce routing table size and conserve Class C addresses.
    • Rules:
      • Must be a power of 2.
      • Must be contiguous.
      • First address' third byte must be evenly divisible by the number of blocks.
      • Single interface condition.
    • Supernet mask: Has fewer 1s than the default mask.

    Classless Inter-Domain Routing (CIDR)

    • A new addressing scheme that allows for more efficient allocation of IP addresses.
    • Uses hierarchical routing and variable length subnet masks.
    • Administrative Procedure: Large ISPs control large address blocks and allocate smaller blocks to smaller ISPs and customers.
      • Internet Assigned Numbers Authority (IANA) issues CIDR blocks to regional Internet registries (RIRs).
      • RIRs subdivide blocks and allocate them to local Internet registries (LIRs).
    • Technical Procedure:
      • Route summarization reduces the number of routes in routing tables by representing multiple network numbers with a single summary address.

    CIDR and Its Benefits

    • Solves the problem of running out of IP addresses and routing table capacity.
    • Restructures addresses to make allocation more efficient.
    • Uses hierarchical routing to minimize routing table entries.

    Example of CIDR

    • In a CIDR address like 206.13.01.48/25, the "/25" indicates that the first 25 bits represent the network prefix.
    • This allows for flexible block sizes, from 32 hosts to over 500,000 hosts.

    Forwarding with Classless Addressing

    • Requires at least four columns in the routing table.
    • Uses longest prefix matching algorithm.
    • An exception route allows for forwarding even if a network is not connected to the original router.

    CIDR vs. Variable Length Subnet Mask (VLSM)

    • Similarities:
      • Recursive creation of smaller subnetworks.
      • Extended prefix support.
      • Longest prefix match forwarding algorithm.
      • Topologically significant addresses for aggregation.

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    Related Documents

    Lecture04-2024.pdf

    Description

    Explore the concepts of Supernetting and Classless Inter-Domain Routing (CIDR) in this quiz. Learn how these methods optimize address allocation and routing efficiency in network management. Test your knowledge on the rules and procedures involved in these addressing schemes.

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