Interview Articles

Interview Question: What is the default timeout value for TCP, UDP and ICMP sessions?

The default timeout value for TCP sessions is typically around 75 seconds. This value is determined by the operating system and can vary depending on the specific implementation. TCP TCP is a reliable, connection-oriented protocol that is used to establish a secure...

Interview Question: What is Policy NAT?

Policy NAT, also known as policy-based NAT, is a method of configuring Network Address Translation (NAT) on a router or firewall. It allows for more granular control over the translation of IP addresses, as opposed to the traditional method of NAT, known as basic NAT...

Interview Question: What is the function of a transparent firewall?

A transparent firewall, also known as a layer 2 firewall, functions as a security barrier between different networks or subnets. It operates at the data link layer (layer 2) of the OSI model, which is responsible for creating logical links between devices on a...

Interview Question: Firewalls work in which OSI layers?

Firewalls are an important component of network security, and they operate at various layers of the OSI model. Understanding the different layers in which firewalls operate can help administrators understand how they work and how to use them effectively. Layer 3 -...

Interview Question: What is the function of a firewall?

A firewall is a security device that monitors and controls incoming and outgoing network traffic based on a set of security rules and policies. The primary function of a firewall is to block unauthorized access while allowing authorized communications to pass through. It is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules and policies. Firewalls can be hardware-based or software-based, and are commonly used to protect networks from unauthorized access and various cyber threats.

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