All The Useful Network Engineer Interview Questions & Answers

Q 1. What are the layers of the OSI reference model?
There are 7 layers of the OSI reference model:

Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer

Q 2. What is the backbone network?
It is a consolidated infrastructure that is being designed to circulate various routes and data to the different networks. It is also responsible for handling the multiple channels and bandwidth management.

Q 3. What are routers?
Routers are used to connect multiple network segments. They are known as intelligent network devices which store the information in their routing tables; such as hops, paths, and bottlenecks. With the help of this information, they can easily figure out the best path for transferring the data. Routers operate at the third layer of the OSI model which is the Network Layer.

Q 4. How does a network topology affect your decision to set a network?
Network topology tells you to decide which media you should use for interconnecting the devices. It also helps in serving as the basis of materials, terminations, and the connectors which are applicable for the setup.

Q 5. How many layers are there under TCP/IP?
There are 4 layers under TCP/IP:
Network Layer
Internet Layer
Transport Layer
Application Layer

Q 6. What is the importance of implementing a Fault Tolerance System?
Implementing a fault tolerance system is the feature that helps the system to continue working with its operations even though there is some failure on any part of the system.
Fault Tolerance systems are created to provide opportunity even when there is the forecasting of service disruptions whether intended or unintended.
It provides security in terms of protecting the system from hacking and malicious intrusions.
It supports multitasking.

Q 7. What are the functions of a network administrator?
A network administrator has multiple responsibilities however, these can be compiled into the three main functions:

Installation of a network
Configuration of the network settings
Maintenance and troubleshooting of the networks

Q 8. How can you manage a network using a router?
Routers have inherent security that allows you to design various settings, similar to security and information logging. You can dole out limitations to PCs, for example, what assets it is permitted access to or what specific time, they can browse the Web. You can also add the limitations on what websites are not perceptible across the whole network.

Q 9. What are firewalls?
A firewall means the network security system that helps in controlling and monitoring all the network traffic whether incoming or outgoing which is depending upon the predefined security rules. A firewall builds the boundaries between the trusted and untrusted networks.

Q 10. How can you identify the IP class of a given IP address?
The IP class of a given IP address can be identified by simply looking at the first octet of the given IP address.

Three IP classes can be identified by:

Class A: If the first octet begins with a 0 bit
Class B: if it begins with 10 bits
Class C: if it begins with 110

Q 11. What are the different ways of securing a computer network?
There are uncountable ways of securing a computer network. Installing the reliable and most updated antivirus software on the computer. Ensure the setup of firewalls is configured correctly. For securing a computer network, user authentication helps a lot. If you follow all these things, it will make a highly secured network.

Q 12. What is a node?
Node means to the point where any connection takes place. They can either be a device or computer which is a part of the network. For building the network connection, two or more forms are required.

Q 13. What is anonymous FTP?
Anonymous File Transfer Protocol (FTP) is a process of giving users access to the files that are in the public servers. The users do need to identify themselves who are allowed to access the data in these servers, instead, they can log in as the anonymous guest.

Q 14. What is data encapsulation?
It is the procedure of dividing a large amount of information into smaller chunks before transmitting them across the networks. During this process, it is important to check that the addresses of source and destination are attached to their headers.

Q 15. What is a VPN?
VPN stands for Virtual Private Network. This is an innovation that permits a protected tunnel to be made across the network like the Internet. For instance, they allow you to create a secure dial-up connection with a remote server.