Networking Interview Questions: Networking job interviews are always brainstorming and important for the candidates. Having being successful in the Networking interview questions signifies that the applicant has found the carrier to their dream career. Job interviews are always stressful. Therefore, to minimize the tension and nervousness caused before the interviews; the Aptron's Networking specialists, Networking experts, and Networking trainers who have put their quality skill and understanding while developing the Networking interview questions and answers for freshers, and experience aspirants. If Networking job seekers pursue the networking interview questions provided below, their stress can be minimized to nil. This piece of write-up includes thorough answers covering basic and advanced Networking interview questions. Giving the relevant answers to networking interview question can help in deciding the destiny of the candidates. Thus, it is immensely significant to answer effectively and self-assuredly during the interview sessions by the applicants so that interviewers can deem applicants’ knowledge and talent for the employment.
Networking means connecting computers, mobile phones, peripherals, IoT devices, switches, routers, and wireless access points for transmitting text data and voice data from source to the destination. Devices connected in a wired or wirelessly to communicate with one another or with other networks over internet or intranet is called networking. Devices that originate, route, and terminate the data are called nodes. Nodes have their defined network addresses encrypted with coding and various communication protocols. This fearsome collection of information technology necessitates skilled network management to keep it all running reliably.
Networking Interview Questions And Answers
1. What is a Network?
A network is a set of devices connected to each other using a physical transmission medium.
Example: A Computer Network is a group of computers connected with each other to communicate and share information and resources like hardware, data, and software across each other.
In a network, nodes are used to connect two or more networks.
2. What is a Node?
Two or more computers are connected directly by an optical fiber or any other cable. A node is a point where a connection established. It is a network component that is used to send, receive and forward the electronic information.
3. What is Network Topology?
Network Topology is a physical layout of the computer network and it defines how the computers, devices, cables etc are connected to each other.
4. What are Routers?
The router is a network device that connects two or more network segments. The router is used to transfer information from the source to the destination.
Routers send the information in terms of data packets and when these data packets are forwarded from one router to another router then the router reads the network address in the packets and identifies the destination network.
5. What is the OSI reference model?
Open System Interconnection, the name itself suggests that it is a reference model that defines how applications can communicate with each other over a networking system.
It also helps to understand the relationship between networks and defines the process of communication in a network.
6. What is HTTP and what port does it use?
HTTP is HyperText Transfer Protocol and it is responsible for web content. Many web pages are using HTTP to transmit the web content and allow the display and navigation of HyperText.
It is the primary protocol and port used here is TCP port 80.
7. What is HTTPs and what port does it use?
HTTPS is a Secure HTTP. HTTPS is used for secure communication over a computer network. HTTPS provides authentication of websites that prevents unwanted attacks.
In bi-directional communication, HTTPS protocol encrypts the communication so that the tampering of the data gets avoided. With the help of an SSL certificate, it verifies if the requested server connection is a valid connection or not. HTTPS uses TCP with port 443.
8. Explain the Different layers of the OSI model.
The different layers of the OSI model are given below:
Physical Layer: Converts data bit into an electrical impulse.
Datalink Layer: Data packet will be encoded and decoded into bits.
Network Layer: Transfer of datagrams from one to another.
Transport Layer: Responsible for Data transfer from one to another.
Session Layer: Manage and control signals between computers.
Presentation Layer: Transform data into application layer format.
Application Layer: An end user will interact with the Application layer.
9. Describe Hub, Switch and Router?
Hub: Hub will broadcast all data to every port. It has a common connection point for all devices.
Switch: Switch will create the dynamic connection and provide information to the requesting port.
Router: Router is the devices which will be responsible for forwarding data packets.
10. What do you mean by the TCP/IP Model?
TCP/IP stands for Transmission control protocol and Internet protocol. It describes how the data will get transmitted and routed from end to end communication.
11. Explain the different Layers of TCP/IP Model.
Application Layer, Transport Layer, Network or Internet Layer, Network interface layer.
12. What do you mean by a Firewall?
Firewall is a concept of a security system that will helps computers to protect it with unauthorized access or any cyber-attack.
13. What do you mean by DNS?
DNS Stands for Domain Name System. It’s an internet address mapping process with the local name. We can also call it as an internet phonebook.
14. What do you mean by Proxy server?
Proxy server prevents the external users which are unauthorized to access the network.
15. What do you mean by Classes of Network?
The Classes of IPV4 are of 5 types:
Class A: 0.0.0.0 to 127.255.255.255
Class B: 126.96.36.199 to 188.8.131.52
Class C: 192.0.0.0 to 184.108.40.206
Class D: 220.127.116.11 to 18.104.22.168
Class E: 240.0.0.0 to 247.255.255.255
16. What is a LAN?
LAN is short for Local Area Network. It refers to the connection between computers and other network devices that are located within a small physical location.
17. What is point to point link?
It refers to a direct connection between two computers on a network. A point to point connection does not need any other network devices other than connecting a cable to the NIC cards of both computers.
18. What is anonymous FTP?
Anonymous FTP is a way of granting user access to files in public servers. Users that are allowed access to data in these servers do not need to identify themselves, but instead log in as an anonymous guest.
19. What is subnet mask?
A subnet mask is combined with an IP address in order to identify two parts: the extended network address and the host address. Like an IP address, a subnet mask is made up of 32 bits.
20. What is data encapsulation?
Data encapsulation is the process of breaking down information into smaller manageable chunks before it is transmitted across the network. It is also in this process that the source and destination addresses are attached into the headers, along with parity checks.
21. Describe Network Topology
Network Topology refers to the layout of a computer network. It shows how devices and cables are physically laid out, as well as how they connect to one another.
22. What is VPN?
VPN means Virtual Private Network, a technology that allows a secure tunnel to be created across a network such as the Internet. For example, VPNs allow you to establish a secure dial-up connection to a remote server.
23. Briefly describe NAT.
NAT is Network Address Translation. This is a protocol that provides a way for multiple computers on a common network to share single connection to the Internet.
24. What is netstat?
The "netstat" is a command line utility program. It gives useful information about the current TCP/IP setting of a connection.
25. What do you understand by ping command?
The "ping" is a utility program that allows you to check the connectivity between the network devices. You can ping devices using its IP address or name.
26. What is Sneakernet?
Sneakernet is the earliest form of networking where the data is physically transported using removable media.
27. Explain the peer-peer process.
The processes on each machine that communicate at a given layer are called peer-peer process.
28. What is a congested switch?
A switch receives packets faster than the shared link. It can accommodate and stores in its memory, for an extended period of time, then the switch will eventually run out of buffer space, and some packets will have to be dropped. This state is called a congested state.
29. What is RSA Algorithm?
RSA is short for Rivest-Shamir-Adleman algorithm. It is mostly used for public key encryption.
30. What is Stop-and-Wait Protocol?
In Stop and wait protocol, a sender after sending a frame waits for an acknowledgment of the frame and sends the next frame only when acknowledgment of the frame has received.
31. What is Piggybacking?
Piggybacking is used in bi-directional data transmission in the network layer (OSI model). The idea is to improve efficiency piggyback acknowledgment (of the received data) on the data frame (to be sent) instead of sending a separate frame.
32. What is DHCP, how does it work?
The idea of DHCP (Dynamic Host Configuration Protocol) is to enable devices to get IP address without any manual configuration.
The device sends a broadcast message saying “I am new here”
The DHCP server sees the message and responds back to the device and typically allocates an IP address. All other devices on network ignore the message of the new device as they are not DHCP server.
In Wi-Fi networks, Access Points generally work as a DHCP server.
33. What Are Super Servers?
These are fully-loaded machines which includes multiprocessors, high-speed disk arrays for interview I/O and fault tolerant features.
34. What Is A Tp Monitor?
There is no commonly accepted definition for a TP monitor. According to Jeri Edwards' a TP Monitor is "an OS for transaction processing"
35. What Is Meant By Asymmetrical Protocols?
There is a many-to-one relationship between clients and server. Clients always initiate the dialog by requesting a service. Servers are passively awaiting for requests from clients.
36. What Is The Difference Between Trigger And Rule?
The triggers are called implicitly by database generated events, while stored procedures are called explicitly by client applications.
Career scopes and salary scale
It is estimated that the size of networking market expanding in USA, Europe and Australia. Manufacturing, hospitality, banks, retail, real estate, and of course, software development sectors are expanding along with technology. The need of network specialists is found to be at higher side. Today, technology expansion is dependent upon the Networking presentation. Besides, Networking has occupied the topmost place across the industries. A newly joined Networking candidate in an organization can expect a minimum salary of 28, 000 dollars per annum, which gets to double once you have acquired a lot of experience. The salaries are very reliant upon the location, business, and the company’s requirements.
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