Networking Interview Questions
Categories: Hardware & Networking
Ques 1. What is the network? Ans. According to Merriam-Webster, Network is usually an informally interconnected group or association of different entities like a person, computers, radio stations, etc. For example, Dominos has a network of 1232 branches across India. As the name suggests the computer network is a system of peripherals or computers interconnected with each other and has a standard communication channel established between them to exchange different types of information and data. Ques 2. Why is the computer network so important? Ans. Have you ever heard of the Internet or the NET? I guess you have, as you are already reading this article on Interviewbit surfing the internet. But, have you ever thought about the internet? The Internet is a network of a network connecting all different network-enabled devices which enable data and information sharing between them and that makes computer networks a core part of our life and technical interviews. Ques 3. What is an IPv4 address? What are the different classes of IPv4? Ans. An IP address is a 32-bit dynamic address of a node in the network. An IPv4 address has 4 octets of 8-bit each with each number with a value up to 255. IPv4 classes are differentiated based on the number of hosts it supports on the network. There are five types of IPv4 classes and are based on the first octet of IP addresses which are classified as Class A, B, C, D, or E. IPv4 ClassIPv4 Start AddressIPv4 End AddressUsage A0.0.0.0127.255.255.255Used for Large Network B128.0.0.0191.255.255.255Used for Medium Size Network C192.0.0.0223.255.255.255Used for Local Area Network D224.0.0.0239.255.255.255Reserved for Multicasting E240.0.0.0255.255.255.254Study and R&D Ques 4. Explain LAN (Local Area Network) Ans. LANs are widely used to connect computers/laptops and consumer electronics which enables them to share resources (e.g., printers, fax machines) and exchange information. When LANs are used by companies or organizations, they are called enterprise networks. There are two different types of LAN networks i.e. wireless LAN (no wires involved achieved using Wi-Fi) and wired LAN (achieved using LAN cable). Wireless LANs are very popular these days for places where installing wire is difficult. The below diagrams explain both wireless and wired LAN. Ques 5. Tell me something about VPN (Virtual Private Network) Ans. VPN or the Virtual Private Network is a private WAN (Wide Area Network) built on the internet. It allows the creation of a secured tunnel (protected network) between different networks using the internet (public network). By using the VPN, a client can connect to the organization’s network remotely. Ques 6. What are the advantages of using a VPN? Ans. Below are few advantages of using VPN: a. VPN is used to connect offices in different geographical locations remotely and is cheaper when compared to WAN connections. b. VPN is used for secure transactions and confidential data transfer between multiple offices located in different geographical locations. c. VPN keeps an organization’s information secured against any potential threats or intrusions by using virtualization. d. VPN encrypts the internet traffic and disguises the online identity.