Networking Interview Questions are mentioned in this article to train aspirants preparing for networking interviews lined up by organizations. After that, they will be able to crack the interviews without any problem. Now without wasting any time, let’s continue with the topic!
What is a Network?
A network is a group of interconnected computers, gadgets, or systems that can communicate with one another and share resources, like data and services, allowing users and gadgets to collaborate and transfer data. Depending on their geographic scope and intended use, networks can be local (LAN) or worldwide (WAN).
Top 20 Networking Interview Questions
- What is a protocol?
In networking, a protocol is a set of guidelines and standards that control how information is sent through a network, received, and processed, providing consistent and dependable communication.
Examples of these are HTTP (Hypertext Transfer Protocol) for web browsing and TCP/ IP (Transmission Control Protocol/ Internet Protocol) for internet communication.
2. What is pipelining?
In networking, the term “pipelining” refers to a method that enables many data processing stages to run simultaneously, increasing data transmission efficiency by minimizing latency and overlapping jobs.
To facilitate the transport of web page components, it is frequently used in protocols like HTTP/ 1.1.
3. What is the hub in networking?
A hub is a basic networking device that connects multiple devices in a local area network (LAN). It is less effective and secure than switches or routers because it merely broadcasts data received from one device to every other device on the network without intelligence to determine the destination.
Hubs are primarily no longer used because more sophisticated networking hardware has mostly taken their place.
4. What is a switch in networking?
A switch, which improves network performance and security over hubs, is a complex networking device that links several devices inside a local area network (LAN) and intelligently forwards data only to the devices that require it.
Switches are essential for contemporary Ethernet-based networks and operate at the data connection layer (Layer 2) of the OSI model.
5. What is simplex in networking?
In networking, the term “simplex” refers to a communication mode in which data can only flow in one direction—from the sender to the receiver—and in which two-way or bidirectional communication is not possible.
In situations like television transmission, where one device or party predominantly delivers information and the other largely receives it, it is frequently utilized.
6. What are the factors that affect the performance of the network?
Several factors can impact the performance of a network:
a) Bandwidth: How rapidly data may be transported can be considerably impacted by the network connection’s available bandwidth or data transfer rate. Faster data transfer is made possible by greater bandwidth.
b) Latency: The delay in data transmission from the sender to the receiver is known as latency. For real-time applications like video conferencing and online gaming, lower latency is essential.
c) Network Congestion: Data transfer rates can slow down and packet loss can occur on a network that is overloaded or congested.
d) Hardware and Infrastructure: Network performance is influenced by the caliber and capacity of networking hardware, including
- Switches, and
Hardware that is too old or not enough can cause bottlenecks.
e) Protocol Efficiency: Performance may be impacted by network protocol selection and data handling effectiveness. Data transmission can be optimized and overhead can be reduced with efficient protocols.
7. What is LAN in networking?
Local Area Networks are networks of connected devices that are located in a certain geographic area, such as
a) A home,
b) Office, or
Devices can share resources and communicate with one another across LANs, usually at high data transfer rates and low latency.
8. What is WAN in networking?
A wide area network is a network that connects LANs in various places, often even spanning entire continents.
Long-distance data transfer between distant sites is made possible by WANs, which make use of a variety of communication technologies, including
a) Leased Lines,
b) Satellite Links, and
c) The Internet.
9. What is MAN in networking?
A metropolitan area network, which often serves a city or metropolitan region, is a network that spans a greater geographic area than a LAN but is smaller than a WAN.
It links various LANs in a single metropolitan region, enabling data interchange between them.
10. Name of the software layers or User support layer in the OSI model.
The Application Layer (Layer 7) of the OSI (Open Systems Interconnection) model contains the majority of the software layers relevant to user assistance.
This layer consists of software elements and protocols that communicate directly with users and offer user-friendly user interfaces for
a) Network Resources,
b) Services, and
11. Define HTTPS protocol.
The Hypertext Transfer Protocol Secure (HTTPS) is a secure communication protocol that is used to encrypt data sent between a web browser and a website’s server, preserving the confidentiality and integrity of sensitive data such as
a) Login Credentials and
b) Financial Transactions.
It offers a secure browsing experience by encrypting data during transmission using SSL/ TLS.
12. What is a zone-based firewall?
A zone-based firewall is a kind of network firewall that divides a network into zones or segments according to security needs and sets policies to govern traffic between these zones.
This type of firewall improves security by managing traffic flow at a higher level of abstraction than typical firewall rules.
Instead of focusing on specific IP addresses or ports, it focuses on defining and implementing security standards between zones.
13. What is a server farm?
Often used to manage heavy web traffic, host applications, or store data, a server farm is a group of connected servers or data centers that collaborate to provide scalable and reliable computing resources and services.
Server farms are crucial for modern Internet services and applications because they
a) Distribute Workloads,
b) Enhance Redundancy, and
c) Provide High Availability.
14. What is a VPN?
A virtual private network (VPN) is a technology that creates a secure and encrypted connection across a public network, such as the Internet, enabling users to access private network resources or browse the web with increased privacy and security.
15. What are Confidentiality, Integrity & Availability?
Information security is based on the CIA principles of confidentiality, integrity, and availability.
a) Confidentiality: This rule makes sure that private, sensitive information is only accessed by approved people or systems. It prevents
- Unauthorized Access,
- Disclosure, or
- Exposure of Confidential Data.
b) Integrity: Integrity ensures that data and systems are accurate and reliable. It means that data is protected from unwanted changes or manipulation and stays unaltered and uncorrupted while being
- Processed, or
b) Availability: System, resource, and data availability ensures that they are available to authorized users at all times. It provides protection against interruptions, outages, and denial-of-service assaults that can make data or services inaccessible.
16. At what layer does IPsec work?
IPsec (Internet Protocol Security) provides security features for IP packets including authentication and encryption while operating at the Network Layer (Layer 3) of the OSI model.
17. What is IP Spoofing?
IP spoofing is a cyberattack method where a hacker modifies the source IP address in a network packet to assume the identity of another, trustworthy entity. This is frequently done to trick users or obtain unauthorized access to systems.
18. What is NIC?
Network Interface Card, or NIC for short, is a piece of hardware that enables computers to join a network and communicate with other gadgets.
19. What is the meaning of AAA in network security?
The acronym AAA, which stands for authentication, authorization, and accounting, refers to a framework for restricting access and monitoring user behavior in network security.
20. What is traceroute? Why is it used?
An internet packet’s journey from one host to another can be tracked using the network diagnostic tool Traceroute. It assists in debugging network connectivity difficulties by locating network delays, routing faults, and the order in which packets pass via routers and network nodes.
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