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Thanks for addressing the reviewer's comments properly.
[# PeerJ Staff Note - this decision was reviewed and approved by Yilun Shang, a PeerJ Section Editor covering this Section #]
Clear now
methods are described with sufficient details and relevant information
conclusions are well stated
The authors have addressed my comments well.
Thank you for following my comments to improve the manuscript.
Good work
Good research
Although enriching with more recent and related references is needed, It is not essential to have specific ones mentioned in the reviewer comments.
More clarification for the contribution in the abstract is highly recommended.
**PeerJ Staff Note:** It is PeerJ policy that additional references suggested during the peer-review process should only be included if the authors are in agreement that they are relevant and useful.
**PeerJ Staff Note:** Please ensure that all review, editorial, and staff comments are addressed in a response letter and any edits or clarifications mentioned in the letter are also inserted into the revised manuscript where appropriate.
clear
good structure
clear results
orignal
primary research
described well
conclusions supported by results
In this paper the authors have proposed a controller placement problem approach leveraging the critical switch awareness in SDN (software defined networking).
I recommend the following changes (must) be addressed by the authors:
Enlist the limitations of each work in the literature review.
Moreover, include some recent literature i.e. on the controller placement problem in SDN such as:
Ali, J. and Roh, B.H., 2022. An Effective Approach for Controller Placement in Software-Defined Internet-of-Things (SD-IoT). Sensors, 22(8), p.2992. and
Ali, J., Lee, S. and Roh, B.H., 2019, June. Using the analytical network process for controller placement in software defined networks (poster). In Proceedings of the 17th Annual International Conference on Mobile Systems, Applications, and Services (pp. 545-546).
Describe the motivation for the controller placement and novel contributions of your works.
What is the controller overhead? Can the authors represent it mathematically with the help of an equation or formula.
Include some future research directions.
Please follow my comments to improve the manuscript.
1. Write the full meaning of SDWAN in abstract.
2. In "Algorithm2: Critical Switch Identification" and Equation no 17, what is SiBC? Discuss in detail.
3. Include a Flowchart for "Algorithm 3: Critical Switch Aware Network Partition (CSANP)"
4. Include more citations from latest research paper.
5. Write a major weak point of the research in conclusion.
In experimental design include the processing time to Placement.
Good research work. Discuss detail about How many typology grabbed from Internet Topology Zoo?
Correct the position of Equation number and improve the English.
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