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Firewall Interview Questions and Answers

1
What is firewall?

A firewall is a hardware or software installed to provide security to the private networks connected to the internet. They can be implemented in both hardware and software, or a combination of both. All data entering or leaving the Intranet passes through the firewall which allows only the data meeting the administrators’ rules to pass through it.

2
What is Log Processing?

How audit logs are processed, searched for key events, or summarized.

3
Define Digital Signatures.

Digital signature is an attachment to an electronic message used for security purpose. It is used to verify the authenticity of the sender.

4
What is Access Control Lists?

Rules for packet filters (typically routers) that define which packets to pass and which to block.

5
What are the types of firewalls?

Packet Filtering Firewall:
This type of Firewall detects packets and block unnecessary packets and makes network traffic release.

Screening Router Firewalls:
It's a software base firewall available in Router provides only light filtering.

Computer-based Firewall:
It's a firewall stored in server with an existing Operating System like Windows and UNIX.

Hardware base Firewall:
Its device like box allows strong security from public network. Mostly used by big networks.

Proxy Server:
Proxy server allows all clients to access Internet with different access limits. Proxy server has its own firewall which filters the all packet from web server.

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