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Network Security Engineer Interview Questions


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How many bits do you need for a subnet size.

3 Answers

Need to know subnetting off top of your head.

If number of addreses required in a subnet is "N" , then you need 2 more (network and bcst addreses) in addition to "N". So "N+2" is rounded of to Next 2 to the power . For e.g if we need 64 addresses in a subnet then , 66 rounded to next 2 to the power is is 2**7 ie 128. so number of bits required is 7.

The minimum addresses needed is 2 bits for 4 addresses 2^(# of addresses) = 2^2 which used for pint to point links. Max addresses can go as much as class A IP address /8 so for maximum bits is 32-8 = 24 bit

Nothing as such, it was very straightforward

1 Answer

They were standard questions. They want to see if you are a "cultural" fit.

1 Answer

How would you design our network?

1 Answer

What were some of things you've accomplished at your previous company?

Interview was hard and asking lot of question based security

1 Answer

Do you consider yourself a Senior?

2 Answers

None. Recruiters avoid answering questions about compensation and scope of work. If someone is you hire is supposedly intelligent and skilled enough to design, build, and troubleshoot large, complex networks, do you think you will trick them into working on the cheap? Even if you did, how long do you think anyone with half a brain would stay? Did you see your horrible reviews?

About a six question quiz. It's not designed for people to get all the answers right, it's designed to see how you think. Use any resources, any, internet, phone, applications on the laptop they'll give you, etc. In general they'll give you a Linux stack trace to analyze, a regex string to create a match for (regex101. Com), how to do something in Linux (tail - F), a code chunk to define what it does, they give you raw configuration files (text based config) for a firewall and ask you to describe details of rule X, Most people get between a 10 and 20 out of 30.

1 Answer

Write out a Cisco ASA firewall configuration on the white board to allow three networks unfiltered access, 12 networks limited access to different resources on different networks, and 8 networks to be blocked altogether.

1 Answer
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