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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

Do you consider yourself a Senior?

2 Answers

More related to security question . Firewall,Rule and NAT rule related. VPN

1 Answer

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

1 Answer

Tech specific questions, nothing to hard. the current network is very dated.

1 Answer


1 Answer

Name and describe the OSI model.

1 Answer

Did you actually do all of the PCI review work?

1 Answer

What experience do you have with Firepower

2 Answers

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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.

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