Network Security Engineer Interview Questions


Network Security Engineer interview questions shared by candidates

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Senior Network and Security Engineer was asked...June 11, 2015

They asked me about Linux OS.

4 Answers


I want a job

If can you help me to get it

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Ascend One

How many bits do you need for a subnet size.

3 Answers

Need to know subnetting off top of your head.

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 Less

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. Less

Bitech International

how soon u can join.

2 Answers

preferably asap.



Do you consider yourself a Senior?

2 Answers



Softcell Technologies

I was asked questions on the networking basics and also certain topics related to the network security. Questions were asked on small things like how does a mail pass or how does a computer boot up to check the in-depth technical knowledge. Also various questions were asked on port nos and protocol nos and some questions related to Linux basics . Lastly some personal questions to end the interview

1 Answers

Learning the course module of CCNA will be of good use for cracking the interview. Doing a certification in the same would be an added advantage. Also Google the most famous questions or most frequently asked questions for this job role. Less


Explain policy (refused to explain if this involves cyber security, Active Directory, firewalls, ...).

1 Answers

I provided answers for cyber security, Active Directory, firewalls, ...

Velocis Systems

Normal Practical Question on ongoing project related and technology which is presently working with

1 Answers

Given all practical answer

State Farm

Name and describe the OSI model.

1 Answers

Gave them the 4-5 layers that I knew off the top of my head, and a rough order. They accepted it and were happy with the detail I added. Less

Rackspace Technology

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 Answers

Using netgroups, a solution was provided in a 40 line configuration.

Rackspace Technology

Wanted a detail breakdown of packet headers.

1 Answers

The key in these questions is to cover the fundamentals, and be ready for the back-and-forth with the interviewer. Might be worth doing a mock interview with one of the Rackspace or ex-Rackspace Network Security Engineer experts on Prepfully? They give real-world practice and guidance, which is pretty helpful. Less

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