An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISPs router using route aggregation.Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?I.202.61.84.0/21II.202.61.104.0/21III.202.61.64.0/21IV.202.61.144.0/21a)I and IV onlyb)III and IV onlyc)l and II onlyd)II and III onlyCorrect answer is option 'D'. Can you explain this answer?

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An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISP's router using route aggregation.
Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?
I. 202.61.84.0/21
II. 202.61.104.0/21
III. 202.61.64.0/21
IV. 202.61.144.0/21

a)
I and IV only
b)
III and IV only
c)
l and II only
d)
II and III only

Correct answer is option 'D'. Can you explain this answer?

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An organization requires a range of IP addresses to assign one to each...

/17 ⇒ 11111111 11111111 10000000 00000000
⇒ 255.255.128.0
1500 ≈ 2048 = 2¹¹ = 2³ × 2⁸
=2^{32 – 21} = 2¹¹= /21
/17 ⇒ 202.61.0.0/17

Sequence is 0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 96, 104, 112, 120.
Hence 64 and 104 is present in sequence so it is the possible IP addresses.
So option (d) is correct.

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An organization requires a range of IP addresses to assign one to each...

IP Address Space Allocation for Routing Entries

In order to minimize the number of routing entries in the ISP's router, the ISP needs to assign an address space to the organization using route aggregation. Let's analyze each potential candidate address space and determine which ones can be allocated by the ISP.

I. 202.61.84.0/21
- This address space falls within the ISP's IP address range of 202.61.0.0/17.
- It has a subnet mask of /21, which means it can accommodate 2^11 (2048) IP addresses.
- However, this address space is not a potential candidate for route aggregation as it is not aligned with the network boundary.

II. 202.61.104.0/21
- Similar to the previous address space, this one also falls within the ISP's IP address range of 202.61.0.0/17.
- It has a subnet mask of /21, providing 2048 IP addresses.
- However, this address space is also not aligned with the network boundary, making it unsuitable for route aggregation.

III. 202.61.64.0/21
- This address space is within the ISP's IP address range.
- It has a subnet mask of /21, allowing for 2048 IP addresses.
- Importantly, this address space is aligned with the network boundary of the ISP's IP address range, making it a potential candidate for route aggregation.

IV. 202.61.144.0/21
- Similar to the other address spaces, this one falls within the ISP's IP address range.
- It has a subnet mask of /21, providing 2048 IP addresses.
- However, this address space is not aligned with the network boundary, making it unsuitable for route aggregation.

Conclusion
Based on the analysis, the potential candidates for the ISP to allot to the organization are:
- III. 202.61.64.0/21
- IV. 202.61.144.0/21

These address spaces are aligned with the network boundary, allowing the ISP to aggregate the routing entries efficiently and minimize the number of entries in their router.

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An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISPs router using route aggregation.Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?I.202.61.84.0/21II.202.61.104.0/21III.202.61.64.0/21IV.202.61.144.0/21a)I and IV onlyb)III and IV onlyc)l and II onlyd)II and III onlyCorrect answer is option 'D'. Can you explain this answer?

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An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISPs router using route aggregation.Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?I.202.61.84.0/21II.202.61.104.0/21III.202.61.64.0/21IV.202.61.144.0/21a)I and IV onlyb)III and IV onlyc)l and II onlyd)II and III onlyCorrect answer is option 'D'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISPs router using route aggregation.Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?I.202.61.84.0/21II.202.61.104.0/21III.202.61.64.0/21IV.202.61.144.0/21a)I and IV onlyb)III and IV onlyc)l and II onlyd)II and III onlyCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An organization requires a range of IP addresses to assign one to each of its 1500 computers. The organization has approached an Internet Service Provider (ISP) for this task. The ISP uses ClDR and serves the requests from the available IP address space 202.61.0.0/17. The ISP wants to assign an address space to the organization which will minimize the number of routing entries in the ISPs router using route aggregation.Which of the following address spaces are potential candidates from which the ISP can allot any one to the organization?I.202.61.84.0/21II.202.61.104.0/21III.202.61.64.0/21IV.202.61.144.0/21a)I and IV onlyb)III and IV onlyc)l and II onlyd)II and III onlyCorrect answer is option 'D'. Can you explain this answer?.

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