Cisco Meraki Support Engineer Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on DSA and OOPS.

Q1. How do you dynamically allocate a 2D array in C?
Ans. 
Use double pointer to dynamically allocate memory for array of strings in C.
• Declare a double pointer to hold the 2D array of strings.

• Allocate memory for the rows first using malloc.

• Then allocate memory for each string in the row using malloc.

• Assign values to the strings in the array.

• Example: char **array = malloc(rows * sizeof(char *));

• Example: array[i] = malloc(strlen(str) + 1); strcpy(array[i], str);
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Q2. What are virtual functions in C++?
Ans. 
Virtual functions in C++ are functions that can be overridden in derived classes, allowing for polymorphic behavior.
• Virtual functions are declared using the 'virtual' keyword in the base class.

• They are used to achieve runtime polymorphism in C++.

• Derived classes can override the virtual functions defined in the base class.

• Example: class Base { public: virtual void display() { cout << 'Base class dis...read more
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Q3. What are virtual base classes?
Ans. 
Virtual base classes are classes that are inherited virtually to avoid multiple instances of the same base class in a derived class hierarchy.
• Virtual base classes are used in multiple inheritance to prevent the Diamond Problem.

• They are declared with the 'virtual' keyword in the base class.

• When a class inherits a virtual base class, the most derived class is responsible for initializing the virtual base class.

• Example: c...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on OS/Networking etc.

Q1. What is the system call that creates a separate connection?
Ans. 
The system call that creates a separate connection is fork()
• fork() is a system call in Unix-like operating systems that creates a new process by duplicating the existing process

• The new process created by fork() is called the child process, while the original process is called the parent process

• fork() is commonly used in network programming to create separate connections for handling multiple clients
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Q2. What does the epoll_wait() system call do?
Ans. 
epoll_wait() system call waits for events on an epoll instance
• Used in Linux for I/O event notification

• Blocks until one or more file descriptors become ready

• Returns the number of file descriptors ready for I/O operations
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Q3. What are the different protocols used in the transport layer?
Ans. 
Different protocols used in the transport layer include TCP, UDP, SCTP, and DCCP.
• TCP (Transmission Control Protocol) - reliable, connection-oriented protocol used for most internet communication

• UDP (User Datagram Protocol) - connectionless protocol used for applications where speed is more important than reliability

• SCTP (Stream Control Transmission Protocol) - supports multiple streams of data, used for telecommunicati...read more
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Q4. What is the difference between TCP and UDP?
Ans. 
TCP is a connection-oriented protocol that ensures reliable data delivery, while UDP is a connectionless protocol that focuses on speed.
• TCP is reliable and ensures data delivery by establishing a connection before sending data.

• UDP is faster but less reliable as it does not establish a connection before sending data.

• TCP is used for applications that require high reliability and error correction, such as web browsing and...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on Networking etc.

Q1. What is the purpose of ICMP?
Ans. 
ICMP is a protocol used for error reporting, diagnostics, and network management in IP networks.
• ICMP is used to report errors in packet delivery

• It is used for network diagnostics and troubleshooting

• ICMP messages are encapsulated within IP packets

• Examples include ping (echo request/reply) and traceroute
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Q2. What are the types of connection release supported by TCP?
Ans. 
TCP supports four types of connection release: active close, passive close, simultaneous close, and abortive close.
• Active close: Client initiates the connection release process by sending a FIN packet.

• Passive close: Server initiates the connection release process by sending a FIN packet.

• Simultaneous close: Both client and server send FIN packets to each other simultaneously.

• Abortive close: Connection is terminated abru...read more
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Q3. What protocols are used by the MAC layer?
Ans. 
The MAC layer uses protocols like CSMA/CA, CSMA/CD, and TDMA to manage access to the network.
• CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) is used in wireless networks to avoid collisions.

• CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is used in wired networks to detect and handle collisions.

• TDMA (Time Division Multiple Access) is used in networks where devices are assigned specific
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Q4. What is the ARP protocol?
Ans. 
ARP (Address Resolution Protocol) is a protocol used to map an IP address to a MAC address in a local network.
• ARP is used to resolve IP addresses to MAC addresses in a local network.

• It operates at the data link layer of the OSI model.

• ARP requests are broadcasted to all devices on the network.

• Example: When a device wants to communicate with another device on the same network, it uses ARP to find the MAC address correspo
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It happened on a coding platform and there were 3 coding questions of medium to hard difficulty level

Q1. Questions on OOP, OS, DBMS, CN
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Q2. Reverse linked list in group of k
Ans. 
Reverse linked list in groups of k nodes
• Iterate through the linked list in groups of k nodes

• Reverse each group of k nodes using iterative or recursive approach

• Update the pointers accordingly to reverse the entire linked list in groups of k
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Q1. Questions related to the resume, regarding projects
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Q2. Multiprocessing vs multithreading
Ans. 
Multiprocessing involves multiple processes running concurrently, while multithreading involves multiple threads within a single process.
• Multiprocessing uses multiple processes to execute tasks simultaneously.

• Multithreading uses multiple threads within a single process to achieve parallelism.

• Multiprocessing is more memory-intensive as each process has its own memory space.

• Multithreading is more lightweight as threads s...read more
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Q3. 2 coding questions (linkedlist and array related)
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Q1. Basic HR questions
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Q2. Products of vmware
Ans. 
VMware offers a range of products including virtualization software, cloud management, networking and security solutions.
• vSphere

• NSX

• vSAN

• Horizon

• Workspace ONE
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General Questions were asked on probability, reasoning, logical etc

Coding questions were easy to medium. There were 2 questions 1 was easy and other was medium. It had 45 mins as time limit

Q1. Data structure questions on strings, DP
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Q2. C++ outputs on constructors
Ans. 
C++ constructors can output messages to the console using cout or printf.
• Constructors can be used to initialize member variables and allocate memory.

• Outputting messages in constructors can be useful for debugging and logging.

• Example: class Person { public: Person() { cout << "Person object created."; } };

• Example: class Car { public: Car() { printf("Car object created.\n"); } };
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1 hour duration, bit maps, strings, domain knowledge

Leetcode medium wasn’t very difficult

I had to do an assignment with an interviewer

Two coding questions to solve in 90 minutes.

Q1. Tell me about yourself.
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