Top Firewall Interview Questions and Answers

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Top Firewall Interview Question and Answer

• Hub4Tech

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Question 1 What is firewall?

• Answer
• 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.

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Question 2 Define Digital Signatures.

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

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Question 3What are the types of firewalls?

• Answer
• Packet Filtering FirewallThis type of Firewall
  detects packets and block unnecessary packets and
  makes network traffic release.
• Screening Router FirewallsIt's a software base
  firewall available in Router provides only light
  filtering.
• Computer-based FirewallIt's a firewall stored
  in server with an existing Operating System like
  Windows and UNIX.
• Hardware base FirewallIts device like box
  allows strong security from public network.
  Mostly used by big networks.
• Proxy ServerProxy 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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Question 4 What is IP Spoofing?

• Answer
• An attack whereby a system attempts to illicitly
  impersonate another system by using its IP
  network address.
• In computer networking, the term IP address
  spoofing or IP spoofing refers to the creation of
  Internet Protocol (IP) packets with a forged
  source IP address, called spoofing, with the
  purpose of concealing the identity of the sender
  or impersonating another computing system

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Question 5 What is Defense in Depth?

• Answer
• The security approach whereby each system on the
  network is secured to the greatest possible
  degree. May be used in conjunction with firewalls.

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Question 6What is the Public Key Encryption?

• Answer
• Public key encryption use public and private key
  for encryption and decryption. In this mechanism,
  public key is used to encrypt messages and only
  the corresponding private key can be used to
  decrypt them. To encrypt a message, a sender has
  to know recipients public key.

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Question 7 What is Worm?

• Answer
• A standalone program that, when run, copies
  itself from one host to another, and then runs
  itself on each newly infected host. The widely
  reported 'Internet Virus' of 1988 was not a virus
  at all, but actually a worm.

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Question 8 What is Least Privilege?

• Answer
• Designing operational aspects of a system to
  operate with a minimum amount of system
  privilege. This reduces the authorization level
  at which various actions are performed and
  decreases the chance that a process or user with
  high privileges may be caused to perform
  unauthorized activity resulting in a security
  breach.

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