Envié una solicitud electrónica. Acudí a una entrevista en Cardo Systems (Ra‘ananna) en feb 2021
Entrevista
Frontal interview with two guys for something like 90 min, first they described the position... small chit chat about the company, after that there were a technical and personal part.
Preguntas de entrevista [1]
Pregunta 1
I was asked how to pass a packet in a switch that don't know which mac address is connected to which port, while mac address represented with 48 bit. The packet is of the form "dest mac|src mac| data"
Solicité el puesto por otro medio. El proceso duró 1 día. Acudí a una entrevista en Cardo Systems (Ra`ananna) en jun 2022
Entrevista
The interviewer (a SW team lead) told me about the company and let me ask questions about it. He then moved on to technical questions and was very patient and helpful.
Preguntas de entrevista [1]
Pregunta 1
He drew me a switch that is responsible for transferring data between devices connected to it via ports. A switch has a number of ports (say 10), and each port can be connected to either a computer or another switch to which other computers are connected. Switches take care of the transfer of packets that consist of a source MAC, destination MAC, and the message itself. The packets must reach the computer with the destination MAC address, and there is no problem if they also reach other computers (they will simply understand that it is not for them and ignore it), but it is less efficient than sending only to the intended computer.
With all this information, he gave me a situation in which there was a power outage, as a result of which the switch did not have the memory that included which MAC address was connected to which port. Now a computer with MAC address A, which is connected to port 1, sends a packet intended for a computer with MAC address B, which is connected to port 2.
How did the switch know to whom to send the packet?
