Cumulus Systems Interview Questions and Answers

Q1. What is IPsec and explain
Ans. 
IPsec stands for Internet Protocol Security, a protocol suite used to secure Internet Protocol (IP) communications.
• IPsec provides authentication, integrity, and confidentiality for data transmitted over a network.

• It can be used to create Virtual Private Networks (VPNs) to securely connect remote offices or users.

• IPsec operates at the network layer of the OSI model and can be implemented through various protocols such a...read more
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Q1. What is Firewalls
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Firewalls are network security systems that monitor and control incoming and outgoing network traffic based on predetermined security rules.
• Firewalls act as a barrier between a trusted internal network and untrusted external networks.

• They can be hardware-based or software-based.

• Firewalls can filter traffic based on IP addresses, ports, protocols, and applications.

• Examples of firewalls include Cisco ASA, Palo Alto Netwo...read more
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Q1. What is your notice period
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My notice period is currently 2 weeks.
• My notice period is 2 weeks

• I am required to give a 2-week notice before leaving my current position

• I can start a new role after 2 weeks from the date of resignation
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There were 3 coding questions to solve on paper and they will analyze and shortlist for the interview and discuss your answers.

Q1. Questions on core java like threads, synchronisation, static vs non static methods , singleton design pattern, copy constructor, reflection.
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Q2. 2 dsa problems 1. Reverse a singly linked list 2. Find pairs in an array which sums to given sum
Ans. 
Two common DSA problems - reversing a singly linked list and finding pairs in an array that sum to a given value.
• To reverse a singly linked list, iterate through the list and change the direction of the pointers.

• To find pairs in an array that sum to a given value, use a hash table to store the difference between the target sum and each element in the array, then check if any subsequent elements match the stored differe...read more
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Q1. 1. Implement queue using stack 2. Remove duplicates from a linked list
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Implement queue using stack & remove duplicates from linked list
• To implement queue using stack, we need to maintain two stacks. One for enqueue operation and another for dequeue operation.

• To remove duplicates from a linked list, we can use a hash table to keep track of visited nodes and remove duplicates as we traverse the list.

• Alternatively, we can use two pointers to compare each node with all subsequent nodes and re...read more
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Q2. What kind of security have you used in your project. Explain from signup to signin.
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Q1. How will you solve any technical difficulties that you were not aware of.
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Q2. Will you be able to handle the responsibility, and work on weekends to meet the deadline.
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Q1. Mostly around data structure
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Q2. Mostly around Threading
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Q1. What is vulnerability management? How do Vulnerability scanners work? What is OWASP top 10? What is SQL injection? How to mitigate SQLi attacks? What is XSS? How to mitigate XSS attacks? What is MITRE fram...read more
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Vulnerability management involves identifying, evaluating, and mitigating security vulnerabilities. Vulnerability scanners scan systems for known vulnerabilities. OWASP top 10 lists common web application security risks. SQL injection and XSS are common attack types. MITRE framework provides a structured approach to cybersecurity. Cyber-kill chain outlines the stages of a cyber attack. Malware analysis involves examini...read more
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