VMware Software Software Engineer Interview Questions, Process, and Tips

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

Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on DSA and OOPS.

Q1. OOPS Question
How to dynamically allocate a 2D array in C?
Ans. 
Using pointer to a pointer : We can create an array of pointers also dynamically using a double pointer. Once we have an array pointers allocated dynamically, we can dynamically allocate memory and for every row.

int** arr = (int**)malloc(r * sizeof(int*));
for (i = 0; i < r; i++)
arr[i] = (int*)malloc(c * sizeof(int));
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Q2. OOPS Question
What are virtual functions in C++?
Ans. 
A virtual function is a member function which is declared within a base class and is re-defined (overridden) by a derived class. When you refer to a derived class object using a pointer or a reference to the base class, you can call a virtual function for that object and execute the derived class’s version of the function. Virtual functions ensure that the correct function is called for an object, regardless of the typ...read more
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Q3. OOPS Question
What are virtual base classes?
Ans. 
Virtual base classes are used in virtual inheritance in a way of preventing multiple “instances” of a given class appearing in an inheritance hierarchy when using multiple inheritances.
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Q4. OOPS Question
If you already have a memory, how will use that memory to allocate a new buffer?
Ans. 
Placement new operator can be used here. In placement new, we can pass a pre-allocated memory and construct an object in the passed memory.
Syntax :
new (address) (type) initializer
As we can see, we can specify an address where we want a new object of given type to be constructed.
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Round duration - 60 minutes
Round difficulty - Easy

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

Q1. Technical Question
What is the system call which creates a seperate connection?
Ans. 
The accept() system call with the connection-based socket types(SOCK_STREAM, SOCK_SEQPACKET). It extracts the first connection request on queue of pending connections for the listening socket, sockfd, creates a new connected socket, and returns a new file descriptor referring to that socket. The newly created socket is not in the listening state. The original socket sockfd is unaffected by this call.
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Q2. Technical Question
What does the epoll_wait() system call do?
Ans. 
The epoll_wait() system call waits for events on the epoll(7) instance referred to by the file descriptor epfd. The buffer pointed to by events is used to return information from the ready list about file descriptors in the interest list that have some events available.
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Q3. Technical Question
What are the different protocols in transport layer?
Ans. 
The transport layer is represented by two protocols: TCP and UDP. The IP protocol in the network layer delivers a datagram from a source host to the destination host. Nowadays, the operating system supports multiuser and multiprocessing environments, an executing program is called a process. When a host sends a message to other host means that source process is sending a process to a destination process. The transport ...read more
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Q4. Networking Question
Difference between TCP and UDP
Ans. 
1. Type of Service : TCP is a connection-oriented protocol. Connection-orientation means that the communicating devices should establish a connection before transmitting data and should close the connection after transmitting the data. UDP is the Datagram-oriented protocol. This is because there is no overhead for opening a connection, maintaining a connection, and terminating a connection. UDP is efficient for broadca...read more
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round with questions based on Networking etc.

Q1. Networking Question
What is the purpose of ICMP?
Ans. 
IP does not have a built-in mechanism that sends control messages and error messages. That is why a protocol like ICMP is needed. Practically, ICMP offers error control and often it is employed to report errors, send management queries and operations information. Network devices like routers need to use the ICMP in order to send the error messages. That is why ICMP is considered as a supporting protocol. It is a known ...read more
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Q2. Networking Question
Types of connection release supported by TCP
Ans. 
1. Graceful connection release – 
In the Graceful connection release, the connection is open until both parties have closed their sides of the connection. 
2. Abrupt connection release – 
In an Abrupt connection release, either one TCP entity is forced to close the connection or one user closes both directions of data transfer.
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Q3. Networking Question
Protocols used by MAC Layer ?
Ans. 
Following Protocols are used by Medium Access Layer :
1. ALOHA : ALOHA is a system for coordinating and arbitrating access to a shared communication channel. It was developed in the 1970s at the University of Hawaii. The original system used terrestrial radio broadcasting, but the system has been implemented in satellite communication systems. A shared communication system like ALOHA requires a method of handling collis...read more
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Q4. Networking Question
What is ARP protocol?
Ans. 
ARP stands for (Address Resolution Protocol) it is responsible to find the hardware address of a host from a know IP address there are three basic ARP terms.
ARP Cache: After resolving the MAC address, the ARP sends it to the source where it is stored in a table for future reference. The subsequent communications can use the MAC address from the table
ARP Cache Timeout: It indicates the time for which the MAC address in ...read more
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