Top 50 Networking Interview Questions and Answers in 2022 | Edureka

The cognition of Networking is the most crucial prerequisite for every interview. Often, these questions seem truly easy, but turn up to be confusing when you go on to answer them. In this article, you will be learning some of the most important Networking Interview Questions along with the answers. To begin with, here are the ten most important Networking Interview Questions : Q1. Differentiate between a router, a hub, and a substitution.
Q2. What is a link ?
Q3. What do you mean by a Node ?
Q4. What does a anchor network hateful ?
Q5. What is Network Topology ?
Q6. Explain what is LAN ?
Q7. What are Routers ?
Q8. What is a Point-to-Point Network ?
Q9. What is OSI Model ?
Q10. Give a brief about each layer in the OSI Model.

Q1. Differentiate between a router, a hub, and a switch.

Connects two or more Ethernet devices Connects two or more LAN devices Can connect devices or a LAN and WAN
Does not perform filtering Filters packets before forwarding them Highly configured to filter and send packets
Least intelligent, least expensive and least complex Similar to a hub, but more effective Extremely smart and complex

Q2. What is a link?

A connection basically is the connection between two or more computers or devices. It can be anything depending on whether it is a physical joining or a radio receiver one. forcible links include cables, hubs, switches, etc and wireless links wireless access points, routers, etc .

Q3. What do you mean by a Node?

The indicate of intersection in a network is called a Node. Nodes can send or receive data/ data within a network. For example, if two computers are connected to form a network, there are 2 nodes in that network. similarly, in event there are computers, there will be three nodes and so on. It is not necessity for a node to be a calculator, it can be any communicating device such as a printer, servers, modems, etc. node-Networking interview questions-Edureka

Q4. What does a backbone network mean?

In any system, spinal column is the most principle component that supports all early components. similarly, in network, a Backbone Network is a network that interconnects respective parts of the net to which it belongs and has a high capability connectivity infrastructure .

Q5. What is Network Topology?

The physical layout of the calculator net is called as Network Topology. It gives the design of how all the devices are connected in a net .

Type Description
Bus Topology All the devices share a common communication line
Star Topology All nodes are connected to a central hub device
Ring Topology Each node connects to exactly two other nodes
Mesh Topology Each node is connected to one or more nodes
Tree Topology (Hierarchical Topology) Similar to star topology and inherits the bus topology
Daisy Chain Topology All nodes are connected linearly
Hybrid Topology Nodes are connected in more than one topology styles
Point-to-Point Topology Connects two hosts such as computers, servers, etc

Q6. Explain what is LAN?

A LAN or Local Area Network the network between devices that are located within a small physical location. It can be either wireless or wired. One LAN differs from another based on the pursue factors :

  • Topology: The arrangement of nodes within the network
  • Protocol: Refer to the rules for the transfer of data
  • Media: These devices can be connected using optic fibers, twisted-pair wires, etc

Q7. What are Routers?

A router is some device that transfers the data packets within a net. It basically performs the traffic directing functions within a network. A datum packet can be anything such as an electronic mail, a web foliate, etc. Routers are located at the invest where two or more networks meet or the gateways. Routers can either be stand-alone devices or virtual. stand-alone routers are traditional devices where as virtual routers are actually softwares that act like physical ones .

Q8. What is a Point-to-Point Network?

A Point-to-Point network refers to a physical joining between two nodes. It can be between any device of a network such as a computer, printer, etc .


For exemplar, as you can see in the above diagram, all the nodes are connected to each other i.e Device 1 is connected to Device 2 and Device 3, Device 2 is connected to Device 3 and Device 1 and Device 3 is connected to Device 2 and Device 1 using physical links .

Q9. What is OSI Model?

OSI stands for open Systems Interconnection. It is a conceptual model that standardizes communication functions of telecommunication. It has 7 layers which are :

  1. Physical Layer
  2. Data Link Layer
  3. Network Layer
  4. Transport Layer
  5. Session Layer
  6. Presentation Layer
  7. Application Layer

OSI Model-Networking interview questions-EdurekaQ10. Give a brief about each layer in the OSI Model.

Layer Name Protocol Description
Physical Layer Symbol Transfers raw bits of data over a physical link
Data Link Layer Frame Reliable transmission of data frames between nodes connected by the physical layer
Network Layer Packet Structures and manages a network with multiple nodes including addressing, routing and traffic control
Transport Layer Segment, Datagram Reliable Transmission of data packets between the different points of a network
Session Layer Data Manages the communication sessions
Presentation Layer Data Transmission of data between the service device and the application
Application Layer Data Specifies the shared communication protocols and the interface methods

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Q11. What do you mean by anonymous FTP?

An anonymous FTP is a direction of allowing a drug user to access data that is public. The exploiter does not need to identify himself to the waiter and has to log in ampere anonymous. so in case you are asked to use anonymous ftp, make certain you add “ anonymous ” in position of your user id. anonymous FTPs are very effective while distributing large files to a draw of people, without having to give huge numbers of usernames and password combinations .

Q12. What is the meaning of Network?

A net is a connection between different devices. These devices communicate with each other using physical or radio receiver connections. forcible connections include wrench match cables, ocular fibers, and coaxial cables .. radio networks can be established with the avail of waves such as radio waves infrared waves and microwaves
Networks basically serve many purposes such as :

  • Sharing hardware devices such as printers, input devices, etc
  • Help in communications in many ways such as audios videos emails messages etc
  • Help in sharing data and information using virtual devices
  • They also help sharing softwares that are installed on other devices

Q13. What do you mean by a Subnet Mask?

A Subnet Mask is the number describing the stove of IP addresses that can be used within a net. They are used to assign subnetworks or subnets. These subnetworks are diverse LAN ’ s connected to the internet. This Subnet mask is basically a 32-bit number and it masks the IP cover and then divides the IP address into two parts i.e the network cover and the host address. Subnet Masks are created by setting all the network bits to “ 1 ” and all the host bits to “ 0 ” sulfur. There are two network addresses that can not be assigned to any server on the network i.e The “ 0 ” and “ 255 ” which are assigned to network and to the broadcast address, and this is why they can not be assigned to any host .

Q14. Give a brief description of the TCP/ IP Model.

The TCP/ IP Model is a compressed adaptation of the OSI Model. This Model contains 4 layers unlike the OSI Model which are :

  1. Process(Application Layer)
  2. Host-to-Host(Transport Layer)
  3. Internet Layer (Network Layer)
  4. Network Access(Combination of Physical and Data Link Layer)

TCP IP-Networking Interview Questions-EdurekaQ 15. What is the difference between the OSI Model and TCP/ IP Model?

TCP/ IP Model OSI Model
Has four layers Has seven layers
More reliable Less reliable
No rigorous boundaries Has nonindulgent boundaries
Horizontal Approach vertical approach

Q16. What is a UTP cable? A UTP cable is a 100 ohm cable made up of bull. It consists of 2-1800 unshielded twisted pairs that are surrounded by a non-metallic event. These twists provide exemption to electrical randomness and EMI. Q17. What is the maximum length allowed for a UTP cable? The maximum length allowed for a UTP cable is 100m. This includes 90 megabyte of solid cable and 10m of standard piece cable television. Q18. Explain what is HTTP and which port does it use? HTTP or HyperText Transfer Protocol allows communication over the Internet. This protocol basically defines how messages are to be transmitted and formatted over the world wide world wide web. HTTP is a TCP/ IP protocol and it uses the port number 80. Features of HTTP Protocol :

  • It is connection-less
  • Does not depend on the type of connecting media
  • Stateless

Q19. What is NAT? NAT stands for Network Address Translation. It deals with remapping one IP Address space with another by changing the IP headers of the packets that are being transmitted across a traffic routing device .

Q20. What is TCP?

TCP or Transmission Control Protocol is a connection-oriented protocol that establishes and maintains a association between communicating devices until both of them are done exchanging messages. This protocol determines how application data can be broken down into packets that can be delivered over a network. It besides sends and receives packets to and from the network level and is in charge of flow control, etc .

Q21. Give a brief explanation about UDP?

UDP or the User Datagram Protocol is used to create a low-latency and loss-tolerating communications between applications connected over the internet. UDP enables process-to-process communication and communicates via datagrams or messages .

Q22. Differentiate between TCP and UDP.

Factor of comparison TCP UDP
joining Connection made before application messages are exchanged Connection not made before application messages are exchanged
manipulation For applications needing more reliability and less speed For applications needing more speedy and less reliability
manipulation by Protocols of the Application Layer File transfer, e-mail, etc Multimedia, DNS
dependability Messages will be delivered in order and without errors No guarantee that the messages will be delivered in order and without errors
Data Segments

Data segments rearranged in required order All segments are independent, therefore has no inherent order specification
acknowledgment ACK is received ACK is not received
Flow Control Has the congestion control mechanism No flow control option
Check for Errors Resends erroneous segments Discards Erroneous segments

Q23. What is RIP?

RIP ( Routing Information Protocol ) is a active route protocol. It makes function of hop count as its primary system of measurement to find the best path between the source and the address. It works in the application layer and has an AD ( Administrative Distance ) measure of 120 .

Q24. Explain what is a firewall?

A firewall is a network security system which is used to monitor and control the network dealings based on some predefined rules. Firewalls are the first line of defense and establish barriers between the internal and external networks in orderliness to avoid attack from untrusted external networks. Firewalls can be either hardware, software or sometimes both .

Firewall-Networking interview questions-EdurekaQ25. Explain what is NOS?

A Network Operating System ( NOS ) is an operate system that is designed to support workstations, databases, personal computers, etc over a network. Some examples of NOS are MAC OS X, Linux, Windows Server 2008, etc. These Operating Systems provide assorted functionalities such as central processing unit support, multiprocessing support, authentication, Web services, etc .

Q26. Explain what is Denial of Service (DoS)?

Denial of Service ( DoS ) is a kind of attack that prevents a legalize user from accessing data over a network by a hacker or an attacker. The attacker floods the server with unnecessary requests in order to overload the server thereby preventing the legitimate users from accessing its services .

Q27. What is the full form of ASCII?

ASCII stands for american Standard Code for Information Interchange. It is a character encoding standard used in the electronic communication field. The ASCII codes basically represent text .

Q28. What is IEEE?

IEEE stands for I nstitute of E lectrical and E lectronics E ngineer. It is the world ’ randomness largest technical master society and is devoted to advancing invention and technological excellence .

Q29. What is a MAC address and why is it required?

MAC or Media Access Control address is a computer ’ s alone number assigned to a Network Interface Controller ( NIC ). It is a 48-bit phone number that identifies each device on a network and is besides referred to as the forcible address. MAC addresses are used as a network address for communications within a network such as an Ethernet, Wi-Fi, etc .

Q30. What is piggybacking?

During transmission of data packets in bipartisan communication, the receiver sends an acknowledgment ( control frame or ACK ) to the receiver after receiving the datum packets. however, the recipient does not send the acknowledgment immediately, but, waits until its network layer passes in the following datum packet. then, the ACK is attached to the outgoing data frame. This process of delaying the ACK and attaching it to the following outgoing data frame is known as piggyback .

Q31. Explain what is DNS?

DNS or Domain Name System is a list arrangement for devices connected over the internet. It is a hierarchical and decentralized system that translates domain names to the numeric IP Addresses which is required to identify and locate devices based on the underlie protocols. All devices connected to the internet have unique IP addresses which are used to locate them on the net. The process involves conversion on hostnames into IP addresses. For case, in sheath the user wants to load some world wide web foliate ( ), this hostname is converted into an IP savoir-faire that can be understood by the computer in holy order to load that vane page .

Q32. Differentiate between Domain and a Workgroup.

Domain Workgroup
Has one or more calculator acting as a server All computers are peers
Has a centralized database Each calculator has its own database
Computers can be on unlike LANs All computers are on the like LAN

Q33. What is OSPF?

OSPF stands for Open Shortest Path First. It is basically a routing protocol that is used to find the best path for packets that are being transmitted over coordinated networks .

Q34. What is Round Trip Time?

Round Trip Time or Round Trip Delay Time refers to the time taken for a signal to be sent and the ACK of that signal to be received .

Q35. What is DHCP?

DHCP or Dynamic Host Configuration Protocol is a network management protocol. It is used on the UDP/IP networks and it automatically assigns IP addresses to the devices on the network. This, in turn, reduces the motivation of a network admin to manually assign IP addresses thereby reducing errors .

Q36. Briefly explain what is ICMP?

ICMP stands for Internet Control Message Protocol and is a part of the Internet Protocol Suite. It is basically a supporting protocol to the Internet protocol and is used to send error messages and information regarding the success or failure of communication with another IP address. For example, if a service is not available an error is reported .

Q37. What is a Ping?

A ping is a computer broadcast that is used to test the reachability of a host and check if can accept requests on an IP network. It works by sending an ICMP ( Internet Control Message Protocol ) Echo to some computer on the network and waits for a reply from it. It can besides be used for troubleshooting .

Q38. What are the advantages of optic fibers?

ocular fibers have a number of advantages such as :

  • Greater bandwidth than other metal cables
  • Low power loss allows longer transmission distances
  • Optic cables are immune to electromagnetic interference
  • Lesser production rates
  • Thin and light
  • The ocular character cable is unmanageable to tap

Q39. What is a client/ server network?

A client/ waiter net is a network where one calculator behaves as a server to the early computers. The waiter is normally more powerful than the clients and serves the clients .

Client server-EdurekaQ40. In a network that contains two servers and twenty workstations, where is the best seat to install an Anti-virus program ?

The best solution is to install anti-virus on all the computers in the network. This will protect each device from the other in case some malicious drug user tries to insert a virus into the servers or legitimate users .

Q41. What do you mean by Ethernet?

Ethernet is a net technology used in LAN, MAN and WAN that connects devices using cables for the transmission of data. It provides services on the Physical and Data Link layers of the OSI Model .

Q42.What is SLIP?

SLIP stands for serial Line Internet Protocol which allows a drug user to access the internet using the modem .

Q43. What is the difference between CSMA/CD and CSMA/CA?

The effect is after a collision The consequence is before a collision
Minimizes the convalescence clock Reduces the hypothesis of a collision
normally used in electrify networks normally used in radio networks

Q44. Briefly explain what is tunnel mode?

Tunnel mode is used to encrypt the hale IP mailboat including the headers and the cargo. It is basically used in a Site-to-Site VPN to secure communications between security gateways, firewalls, etc .

Q45. What do you mean by IPv6?

IPv6 stands for Internet Protocol interpretation 6 and is the latest adaptation of the Intenet Protocol. The IP address duration is 128 bits which resolves the issue of approaching dearth of network addresses .

Q46. Explain the RSA algorithm briefly.

RSA is a cryptosystem used to secure data infection named after Ron Rivest, Adi Shamir and Len Adleman. This algorithm has a public key for encoding while the decoding key is keep secure or private. The encoding key is created using two large premier numbers and is published along with an aide value. Anybody can make manipulation of this public cardinal for encoding but only person with the cognition of the prime numbers can decrypt it. however, this algorithm is considered to be slow and for the same reason, it is not used very frequently to encrypt data .

Q47. What is an encoder?

An encoder is a program, circuit or a device that converts datum from one format to another. Encoders convert analogue signals into digital ones .

Q48. What is a decoder?

A decoder is a course of study, circuit or a device that converts the encode datum into its actual format. Decoders commute digital signals to analog ones .

Q49. What is sneakernet?

Sneakernet is the unofficial term for the transfer of electronic data by physically moving media which can be anything such as a diskette harrow, USB flash, ocular disks, etc .

Q50. What are the components of a Protocol? 

Protocols are a fructify of rules that govern communication. The key elements of a Protocol are as follows :

Name Description
syntax Refers to the structure and format of data
Semantics Refers to the meaning of each portion of bits

Refers to when data should be sent and received

This brings us to the end of this article on Networking Interview Questions. I hope you are clear with all that has been shared with you. Make sure you practice as much as possible and revert your experience.   Got a interrogate for us ? Please mention it in the comments section of this “ Networking Interview Questions ” blog and we will get back to you a soon as possible. To get in-depth cognition on any trending technologies along with its assorted applications, you can enroll for live Edureka Online training with 24/7 corroborate and life access .

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