Real interview questions from top companies for Computer networks. Includes theoretical concepts and coding problems.
What is the difference between a LAN and a WAN?
A LAN (Local Area Network) is a computer network that spans a small geographic area, typically within a building or campus, while a WAN (Wide Area Network) is a computer network that covers a larger geographic area, such as a city or country.
What is the purpose of the TCP/IP protocol suite?
The TCP/IP protocol suite is a set of communication protocols used to interconnect devices on the internet. Its purpose is to provide a standard way for devices to communicate with each other and to ensure that data is delivered reliably and efficiently.
What is the difference between a router and a switch?
A router is a device that connects multiple networks together and routes traffic between them, while a switch is a device that connects multiple devices within a single network and forwards data packets between them.
What is the purpose of DNS?
The purpose of DNS (Domain Name System) is to translate human-readable domain names into IP addresses that computers can understand, allowing users to access websites and other online resources using easy-to-remember domain names instead of difficult-to-remember IP addresses.
What is the difference between HTTP and HTTPS?
HTTP (Hypertext Transfer Protocol) is a protocol used for transferring data over the internet, while HTTPS (Hypertext Transfer Protocol Secure) is a secure version of HTTP that uses encryption to protect data in transit.
What is the purpose of a firewall?
The purpose of a firewall is to control incoming and outgoing network traffic based on predetermined security rules, blocking unauthorized access to a network or system while allowing authorized traffic to pass through.
What is the difference between a hub and a switch?
A hub is a simple network device that connects multiple devices together and broadcasts incoming data to all connected devices, while a switch is a more intelligent device that connects multiple devices together and forwards data packets to the intended recipient only.
What is the purpose of subnetting?
The purpose of subnetting is to divide a large network into smaller, more manageable sub-networks, allowing for more efficient use of IP addresses and improved network security.
What is the difference between a VPN and a proxy server?
A VPN (Virtual Private Network) is a secure, encrypted connection between a device and a network, while a proxy server is a device that acts as an intermediary between a device and a network, hiding the device's IP address and location.
What is the purpose of network segmentation?
The purpose of network segmentation is to divide a network into smaller, isolated segments, each with its own set of access controls and security measures, to improve overall network security and reduce the risk of unauthorized access.
What is the difference between a packet switch and a circuit switch?
A packet switch is a device that forwards data packets between networks, while a circuit switch is a device that establishes a dedicated connection between two devices for the duration of a communication session.
What is the purpose of Quality of Service (QoS)?
The purpose of QoS is to ensure that critical network traffic, such as voice or video, is given priority over less critical traffic, such as email or file transfers, to ensure that the network can handle the traffic efficiently and effectively.
What is the difference between a network intrusion detection system (NIDS) and a network intrusion prevention system (NIPS)?
A NIDS is a system that detects and alerts on potential security threats, while a NIPS is a system that detects and prevents potential security threats in real-time.
Write a Python function to calculate the checksum of a packet
