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 – 10.0.0.0 to 10.255.255.255
For class B – 172.16.0.0 to 172.31.255.255
For class C – 192.168.0.0 to 192.168.255.255
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.