A computer network is a collection of two or more nodes , which are connected together to share their information or resources. If you are working in IT industry or wants to works in IT industry , networking is very important . In this article I will cover 50 basic networking interview question. These question are always asked in interview . So take your time to review these interview questions you will most likely to be asked .

50 Basic Networking Interview Question

1. What is network ?

A network is a set of devices which is connected to each other to share their information or resources .

2. What is node ?

In network, devices that share resources are called nodes . It includes personal computers , servers , phones etc.

3. What is network topology ?

It specifies the layout of computer networks . It shows how devices are connected to each other .

4. What is link ?

Link refers the connectivity between two devices . It includes type of cable and protocol used to communicate other devices.

5. What is gateway ?

A node which is connected to two or more network is known as gateway .

6. What is protocol ?

A protocol is a set of rules that governs all aspect of data communication .

7. What are the layers of the OSI model ?

There are seven OSI layer . These are – Physical layer , Data link layer , Network layer , Transport layer , Session layer , Presentation layer and Application layer .

8. What is NIC ?

NIC stands for Network Interface Card . It is used to connect a computer to a network .Every NIC has its own mac address that identifies the computer on network .

9. What is bandwidth ?

The range of frequencies within a given band ,Which is used to transmitting a signal is called bandwidth.

10. What are IPv4 and IPv6 ?

IP address is an unique value which represents a device over network . IPv4 and IPv6 are version of internet protocol . IPv4 is 32 bit numeric representation of device over network where as IPv6 is 128 bit numeric representation of device over network .

11. What is a router ?

Router is a device which is used to connect two or more than two networks . It act as a gateway . It forward the packet of a network to another network .

12. What is mac address ?

MAC stands for Media Access Control . MAC address is a unique address of the device . It usually stored in ROM of the network adapter card .

13. What is simplex ?

It is mode of communication between two devices , in which flow of data is unidirectional .

14. What is half duplex ?

It is mode of communication between two devices, in which flow of data is bi-directional but not at a same time .

15. What is full duplex ?

It is mode of communication between two devices , in which flow of data is bi-directional and it occurs simultaneously .

16. What is etherchannel ?

It combines multiple physical links into a single logical links .

17. What is Administrative Distance ?

It is used for routing protocol to determine best route . lower AD value has high priority .

18. Why we use NAT ?

NAT stands for Network Address Translation . It is a technique of translating private IP address in to public IP address & vice versa .

19. What are the types of NAT ?

There are three types of NAT . These are – Static NAT , Dynamic NAT & NAT/PAT

20. What are the advantage of NAT ?

you can connecty to internet without showing real ip address and it reduce address overlap occurrence .

21. What is DHCP ?

DHCP stands for Dynamic Host Configuration Protocol . It is used to provide automatic IP to device in the network .

22. What is ACL ?

ACL stands for Access Control List . It specifies which user or system process are granted access to object as well as what operations are allowed on given object .

23. What is VLAN ?

Virtual Local Area Network is an independent LAN uses same infrastructure . It can make a single switch into multiple virtual switches .

24. What is RIP ?

RIP stands for Routing Information Protocol . It is a distance vector routing protocol developed for small network .

25. What is OSPF ?

OSPF stands for Open Shortest Path First . It is a link state routing protocol . It computes shortest path route using Dijkstra’s algorithm . It select best routes by finding the lowest cost paths to a destination .

26. What is BGP ?

BGP stands for Boarder Gateway Protocol . It is a exterior Path vector routing protocol .BGP routing decision are made on the basis of path, network policies and rules .

27 . What is EIGRP ?

EIGRP stands for Enhanced Interior Gateway Routing Protocol . It is a hybrid routing protocol . It uses diffusing update algorithm (DUAL) for determine the most effective route to a destination.

28. What are the layers of TCP/IP protocol suite ?

There are four layers in TCP/IP protocol suite . These are – Network access , Internet , Host to host and Application layer .

29. What is subnetting ?

It allows to break a large network into a bunch of smaller network .

30. What is WAN ?

WAN stands for Wide Area Network . It is a telecommunication or computer network that extends over a large geographical distance .It is often established with leased telecommunication circuit .

31. What is Load balancing ?

It allows a router to use multiple path to a destination when forwarding packet .

32. What is VLSM ?

VLSM stands for Variable Length Subnet Mask . It is a way of subnetting a network to make for the most effective use of all of the bits .

33. What is IP address ?

The Internet Protocol address is a 32 bit long and it uniquely defines a host or router on the internet .

34. What is ICMP ?

ICMP is a Internet Control Message Protocol , a network layer protocol of TCP/IP suite used by host or gateway to send notification of datagram problems back to sender . It also handles both control and error messages.

35. What is ARP ?

ARP stands for Address Resolution Protocol . It is used to find MAC address from IP address .

36. What is POP3 ?

POP3 stands for Post Office Protocol version 3 . It is responsible for accessing the mail service on client machine .

37. What is netstat ?

It is a command line utility program . It gives useful information about current TCP/IP setting of a connection .

38 . Why we use ping command ?

Ping is autility program used for checking connectivity between two devices in the network .

39. What is Round trip time ?

The duration of total time to send a message from one end of network to other end and back is called round trip time (RTT)

40. What is multiplexing ?

it is a set of technique that allows the simultaneous transmission of multiple signals across a single data link .

41. What is Firewall ?

It is used to protect internal network from external attacks . It also prevent other users from external networks from gaining access to private network .

42. Describe star topology ?

It consists of central hub that connects to nodes .

43. What is tracert ?

Tracert is a windows utility program that is used to trace route information of a packet from source to destination .

44. What is DNS ?

DNS stands for Domain Name System . It is used to provide host name to TCP/IP address resolution .

45. What is STP ?

STP stands for spanning Tree Protocol .It is used by switches to ensure that you do not create loops when you have redundant paths in your network .

46. What is broadcast address ?

It is a logical address at which all devices connected to a multiple access communication network are enabled to receive datagrams . A message sent to a broadcast address is typically received by all connected hosts .

47. What is full form of ping ?

Packet Internet Grouper

48. What is range of private IP address ?

For class A – to

For class B – to

For class C – to

49. What is the use of private IP address ?

It is used to assign IP address to intranet .

50. What is NOS ?

NOS stands for Network Operating System . It is used to provide network connectivity to a computer in order to able it to communicate with other computer or devices .

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In this article we discuss about 50 basic networking interview question. I hope this is useful for you.