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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?
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?
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?
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?
What is one of the primary issues that CIDR helps to address?
Which statement is true regarding the usage of CIDR compared to the traditional Class A, B, and C addressing schemes?
Which statement is true regarding the usage of CIDR compared to the traditional Class A, B, and C addressing schemes?
Which of the following describes the function of CIDR in terms of routing tables?
Which of the following describes the function of CIDR in terms of routing tables?
What does CIDR allow in terms of address block assignment?
What does CIDR allow in terms of address block assignment?
What are the two key issues that necessitated the development of CIDR?
What are the two key issues that necessitated the development of CIDR?
Which of the following statements about supernetting is true?
Which of the following statements about supernetting is true?
What is the supernet mask for a network requiring 16 class C addresses?
What is the supernet mask for a network requiring 16 class C addresses?
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?
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?
Which of the following is NOT a characteristic of a supernet?
Which of the following is NOT a characteristic of a supernet?
When an organization needs 2000 addresses, what is the minimum number of class C addresses required for supernetting?
When an organization needs 2000 addresses, what is the minimum number of class C addresses required for supernetting?
In the context of supernetting, what does a default mask of 255.255.255.0 indicate?
In the context of supernetting, what does a default mask of 255.255.255.0 indicate?
Which option correctly lists attributes related to subnetting?
Which option correctly lists attributes related to subnetting?
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?
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?
What is the main purpose of supernetting?
What is the main purpose of supernetting?
Which of the following is NOT a rule associated with supernetting?
Which of the following is NOT a rule associated with supernetting?
What size is a typical Class C address block?
What size is a typical Class C address block?
How many entries would a routing table have if Class C addresses are assigned randomly?
How many entries would a routing table have if Class C addresses are assigned randomly?
If a company needs 600 addresses, which of the following scenarios satisfies supernetting rules?
If a company needs 600 addresses, which of the following scenarios satisfies supernetting rules?
What does CIDR stand for in the context of IP addressing?
What does CIDR stand for in the context of IP addressing?
What is a significant drawback of supernetting?
What is a significant drawback of supernetting?
Which statement accurately describes the third byte condition in supernetting?
Which statement accurately describes the third byte condition in supernetting?
What is the primary purpose of the CIDR procedure in relation to IP addresses?
What is the primary purpose of the CIDR procedure in relation to IP addresses?
How does hierarchical routing aggregation benefit routing tables?
How does hierarchical routing aggregation benefit routing tables?
Which entity issues large, short-prefix CIDR blocks to regional Internet registries?
Which entity issues large, short-prefix CIDR blocks to regional Internet registries?
What is the range of prefix lengths currently used by CIDR?
What is the range of prefix lengths currently used by CIDR?
What does the /25 in the CIDR address 206.13.01.48/25 indicate?
What does the /25 in the CIDR address 206.13.01.48/25 indicate?
What is the result of route summarization in network routing?
What is the result of route summarization in network routing?
What type of blocks do larger ISPs control in the CIDR administration process?
What type of blocks do larger ISPs control in the CIDR administration process?
How are subnet blocks created in the standard subnetting procedure?
How are subnet blocks created in the standard subnetting procedure?
What summarizes the networks 172.31.20.0/24 to 172.31.24.0/24 into a single address?
What summarizes the networks 172.31.20.0/24 to 172.31.24.0/24 into a single address?
In classless addressing, how many columns are needed in a routing table compared to classful addressing?
In classless addressing, how many columns are needed in a routing table compared to classful addressing?
Which statement describes the difference between inclusive summary and exclusive summary?
Which statement describes the difference between inclusive summary and exclusive summary?
What is the longest prefix match used for in routing?
What is the longest prefix match used for in routing?
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?
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?
What occurs if an organization changes its connection from R1 to R4?
What occurs if an organization changes its connection from R1 to R4?
Which of the following is NOT a similarity between CIDR and VLSM?
Which of the following is NOT a similarity between CIDR and VLSM?
What is the binary equivalent of the address 172.31.21.0/24 focusing on the third octet?
What is the binary equivalent of the address 172.31.21.0/24 focusing on the third octet?
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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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.
