Networking Interview Questions And Answers

Networking Interview Questions list for experienced

  1. What is a Link?
  2. What are the layers of the OSI reference model?
  3. What is backbone network?
  4. What is a LAN?
  5. What is a node?
  6. What are routers?
  7. What is point to point link?
  8. What is anonymous FTP?
  9. What is subnet mask?
  10. What is the maximum length allowed for a UTP cable?
  11. What is data encapsulation?
  12. Describe Network Topology
  13. What is VPN?
  14. Briefly describe NAT.
  15. What is the job of the Network Layer under the OSI reference model?
  16. How does a network topology affect your decision in setting up a network?
  17. What is RIP?
  18. What are different ways of securing a computer network?
  19. What is NIC?
  20. What is WAN?
  21. What are proxy servers and how do they protect computer networks?
  22. What is the function of the OSI Session Layer?
  23. What is the importance of implementing a Fault Tolerance System? Are there limitations?
  24. What is a private IP address?
  25. What is NOS?
  26. What is DoS?
  27. What is OSI and what role does it play in computer networks?
  28. What is the advantage of address sharing?
  29. What are MAC addresses?
  30. How can you identify the IP class of a given IP address?
  31. What are firewalls?
  32. What are gateways?
  33. What is tracert?
  34. What are the functions of a network administrator?
  35. What is the use of a default gateway?
  36. One way of securing a network is through the use of passwords. What can be considered as good passwords?
  37. What is the number of network IDs in a Class C network?
  38. What common software problems can lead to network defects?
  39. What is ICMP?
  40. What advantages does fiber optics have over other media?
  41. What is the difference between a hub and a switch?
  42. What are the maximum networks and hosts in a class A, B and C network?
  43. ou need to connect two computers for file sharing. Is it possible to do this without using a hub or router?
  44. What is ipconfig?
  45. Describe networking.
  46. What is client/server?
  47. Describe Ethernet.
  48. What is the role of IEEE in computer networking?
  49. What is IPv6?
  50. What is sneakernet?
  51. How does dynamic host configuration protocol aid in network administration?
  52. QUESTIONS ON COMPUTER NETWORKING
  53. What Is computer network?
  54. Is their any short cut to retrieve the last removed line?
  55. What are the layers of TCP/IP model?
  56. What is Internetworking?
  57. List out some basic networking devices.
  58. Why fiber cables are preferred over copper cables?
  59. What is Crosstalk in networking?
  60. Define the limitation of HUB?
  61. What are the advantages of Switches?
  62. In what form copper and fiber cables transmit data ?
  63. What is Routers?
  64. Does twisted pair cable do crosstalk? And if yes . why?
  65. What is Network Port?
  66. Name a most common plug used by us.
  67. Brief on CSMA / CD.
  68. Name any 5 types of networks.
  69. What are the benefits of VPN?
  70. Explain DNS in the simplest language.

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Top Networking interview questions and answers for freshers and experienced

What is Networking ?

Answer : DO NOT USE. For programming questions use [network-programming] tag. Non-programming networking questions are off topic and should be asked on Network Engineering, Super User or Server Fault instead

Questions : 1 :: What is a Link?

A link refers to the connectivity between two devices. It includes the type of cables and protocols used in order for one device to be able to communicate with the...View answers

Questions : 2 :: What are the layers of the OSI reference model?

There are 7 OSI layers: Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer and Application...View answers

Questions : 3 :: What is backbone network?


A backbone network is a centralized infrastructure that is designed to distribute different routes and data to various networks. It also handles management of bandwidth and various...View answers

Questions : 4 :: 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...View answers

Questions : 5 :: What is a node?

A node refers to a point or joint where a connection takes place. It can be computer or device that is part of a network. Two or more nodes are needed in order to form a network...View answers

Questions : 6 :: What are routers?


Routers can connect two or more network segments. These are intelligent network devices that store information in its routing table such as paths, hops and bottlenecks. With this info, they...View answers

Questions : 7 :: 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...View answers

Questions : 8 :: 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...View answers

Questions : 9 :: 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...View answers

Questions : 10 :: What is the maximum length allowed for a UTP cable?

A single segment of UTP cable has an allowable length of 90 to 100 meters. This limitation can be overcome by using repeaters and...View answers

Questions : 11 :: 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...View answers

Questions : 12 :: 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...View answers

Questions : 13 :: 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...View answers

Questions : 14 :: 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...View answers

Questions : 15 :: What is the job of the Network Layer under the OSI reference model?

The Network layer is responsible for data routing, packet switching and control of network congestion. Routers operate under this...View answers

Questions : 16 :: How does a network topology affect your decision in setting up a network?

Network topology dictates what media you must use to interconnect devices. It also serves as basis on what materials, connector and terminations that is applicable for the...View answers

Questions : 17 :: What is RIP?

RIP, short for Routing Information Protocol is used by routers to send data from one network to another. It efficiently manages routing data by broadcasting its routing table to all other...View answers

Questions : 18 :: What are different ways of securing a computer network?

There are several ways to do this. Install reliable and updated anti-virus program on all computers. Make sure firewalls are setup and configured properly. User authentication will also...View answers

Questions : 19 :: What is NIC?

NIC is short for Network Interface Card. This is a peripheral card that is attached to a PC in order to connect to a network. Every NIC has its own MAC address that identifies the PC on the...View answers

Questions : 20 :: What is WAN?

WAN stands for Wide Area Network. It is an interconnection of computers and devices that are geographically dispersed. It connects networks that are located in different regions and...View answers

Questions : 21 :: What are proxy servers and how do they protect computer networks?

Proxy servers primarily prevent external users who identifying the IP addresses of an internal network. Without knowledge of the correct IP address, even the physical location of the...View answers

Questions : 22 :: What is the function of the OSI Session Layer?

This layer provides the protocols and means for two devices on the network to communicate with each other by holding a session.  This includes setting up the session, managing...View answers

Questions : 23 :: What is the importance of implementing a Fault Tolerance System? Are there limitations?

A fault tolerance system ensures continuous data availability. This is done by eliminating a single point of failure. However, this type of system would not be able to protect data in some...View answers

Questions : 24 :: What is a private IP address?

Private IP addresses are assigned for use on intranets. These addresses are used for internal networks and are not routable on external public networks. These ensures that no conflicts are...View answers

Questions : 25 :: What is NOS?

NOS, or Network Operating System, is specialized software whose main task is to provide network connectivity to a computer in order for it to be able to communicate with other computers and...View answers

Questions : 26 :: What is DoS?

DoS, or Denial-of-Service attack, is an attempt to prevent users from being able to access the internet or any other network services. Such attacks may come in different forms and are done...View answers

Questions : 27 :: What is OSI and what role does it play in computer networks?

OSI (Open Systems Interconnect) serves as a reference model for data communication. It is made up of 7 layers, with each layer defining a particular aspect on how network devices connect...View answers

Questions : 28 :: What is the advantage of address sharing?

By using address translation instead of routing, address sharing provides an inherent security benefit. That’s because host PCs on the Internet can only see the public IP address of...View answers

Questions : 29 :: What are MAC addresses?

MAC, or Media Access Control, uniquely identifies a device on the network. It is also known as physical address or Ethernet address. A MAC address is made up of 6-byte...View answers

Questions : 30 :: How can you identify the IP class of a given IP address?

By looking at the first octet of any given IP address, you can identify whether it’s Class A, B or C. If the first octet begins with a 0 bit, that address is Class A. If it begins...View answers

Questions : 31 :: What are firewalls?

Firewalls serve to protect an internal network from external attacks. These external threats can be hackers who want to steal data or computer viruses that can wipe out data in an instant....View answers

Questions : 32 :: What are gateways?

Gateways provide connectivity between two or more network segments. It is usually a computer that runs the gateway software and provides translation services. This translation is a key in...View answers

Questions : 33 :: What is tracert?

Tracert is a Windows utility program that can used to trace the route taken by data from the router to the destination network. It also shows the number of hops taken during the entire...View answers

Questions : 34 :: What are the functions of a network administrator?

A network administrator has many responsibilities that can be summarize into 3 key functions: installation of a network, configuration of network settings, and maintenance/troubleshooting...View answers

Questions : 35 :: What is the use of a default gateway?

Default gateways provide means for the local networks to connect to the external network. The default gateway for connecting to the external network is usually the address of the external...View answers

Questions : 36 :: One way of securing a network is through the use of passwords. What can be considered as good passwords?

Good passwords are made up of not just letters, but by combining letters and numbers. A password that combines uppercase and lowercase letters is favorable than one that uses all upper case...View answers

Questions : 37 :: What is the number of network IDs in a Class C network?

For a Class C network, the number of usable Network ID bits is 21. The number of possible network IDs is 2 raised to 21 or 2,097,152. The number of host IDs per network ID is 2 raised to 8...View answers

Questions : 38 :: What common software problems can lead to network defects?

Software related problems can be any or a combination of the following:– client server problems– application conflicts– error in configuration– protocol...View answers

Questions : 39 :: What is ICMP?

ICMP is Internet Control Message Protocol. It provides messaging and communication for protocols within the TCP/IP stack. This is also the protocol that manages error messages that are used...View answers

Questions : 40 :: What advantages does fiber optics have over other media?

One major advantage of fiber optics is that is it less susceptible to electrical interference. It also supports higher bandwidth, meaning more data can be transmitted and received. Signal...View answers

Questions : 41 :: What is the difference between a hub and a switch?

A hub acts as a multiport repeater. However, as more and more devices connect to it, it would not be able to efficiently manage the volume of traffic that passes through it. A switch...View answers

Questions : 42 :: What are the maximum networks and hosts in a class A, B and C network?

For Class A, there are 126 possible networks and 16,777,214 hostsFor Class B, there are 16,384 possible networks and 65,534 hostsFor Class C, there are 2,097,152 possible networks and 254...View answers

Questions : 43 :: ou need to connect two computers for file sharing. Is it possible to do this without using a hub or router?

Yes, you can connect two computers together using only one cable. A crossover type cable can be use in this scenario. In this setup, the data transmit pin of one cable is connected to the...View answers

Questions : 44 :: What is ipconfig?

Ipconfig is a utility program that is commonly used to identify the addresses information of a computer on a network. It can show the physical address as well as the IP...View answers

Questions : 45 :: Describe networking.

Networking refers to the inter connection between computers and peripherals for data communication. Networking can be done using wired cabling or through wireless...View answers

Questions : 46 :: What is client/server?

Client/server is a type of network wherein one or more computers act as servers. Servers provide a centralized repository of resources such as printers and files. Clients refers to...View answers

Questions : 47 :: Describe Ethernet.

Ethernet is one of the popular networking technologies used these days. It was developed during the early 1970s and is based on specifications as stated in the IEEE. Ethernet is used in...View answers

Questions : 48 :: What is the role of IEEE in computer networking?

EEE, or the Institute of Electrical and Electronics Engineers, is an organization composed of engineers that issues and manages standards for electrical and electronic devices. This...View answers

Questions : 49 :: What is IPv6?

IPv6 , or Internet Protocol version 6, was developed to replace IPv4. At present, IPv4 is being used to control internet traffic, butis expected to get saturated in the near future. IPv6...View answers

Questions : 50 :: What is sneakernet?

Sneakernet is believed to be the earliest form of networking wherein data is physically transported using removable media, such as disk,...View answers

Questions : 51 :: How does dynamic host configuration protocol aid in network administration?

nstead of having to visit each client computer to configure a static IP address, the network administrator can apply dynamic host configuration protocol to create a pool of IP addresses...View answers

Questions : 52 :: QUESTIONS ON COMPUTER NETWORKING

What do you mean by Proxy server? What do you mean by NIC? What is the role of IEEE in the world of computer network?

Questions : 53 :: What Is computer network?

A network is a group of computers that uses some predesigned protocols to share data and information. A computer networking basically is connected computer systems like laptop, PDA's, Tablet, Mobile...View answers

Questions : 54 :: Is their any short cut to retrieve the last removed line?

 Yes their is a short cut to get the last line removed which is Ctrl +U    

Questions : 55 :: What are the layers of TCP/IP model?

LAYER – 1 : Network Interface This layer characterizes the structure of the information on the link and gives checking 1s and 0s genuinely. Ethernet is the most widely recognized neighborhood...View answers

Questions : 56 :: What is Internetworking?

Internetworking is the procedure or strategy of associating various systems by utilizing delegate gadgets, for example, switches or passage gadgets. Internetworking guarantees information...View answers

Questions : 57 :: List out some basic networking devices.

Cables:Cable is the medium through which information usually moves from one network device to another. Copper Cables: copper cable is a group of two or more copper wires...View answers

Questions : 58 :: Why fiber cables are preferred over copper cables?

1. More noteworthy Bandwidth Copper links were initially intended for voice transmission and have a constrained data transfer capacity. Fiber optic links give more transfer speed to conveying a...View answers

Questions : 59 :: What is Crosstalk in networking?

Crosstalk is defined as electrical pulse on one wire is accidently detected on other wire, which is preferred to be avoided. Share this item with your network: Crosstalk is...View answers

Questions : 60 :: Define the limitation of HUB?

Limitation of HUB: If multiple systems are trying to send data at the same period of time, the electrical pulse sent across the cable can interfere with each other. So, the connection ultimately...View answers

Questions : 61 :: What are the advantages of Switches?

They increase the available bandwidth of the network. They help in reducing workload on individual host PCs They increase the performance of the network. Networks which use switches will have...View answers

Questions : 62 :: In what form copper and fiber cables transmit data ?

Copper Cables: electrical voltage Fiber cables: Pulse of light Properties of copper cable: Tensile strength Ductility Creep resistance Corrosion resistance Fibre Cable: A fiber-optic...View answers

Questions : 63 :: What is Routers?

Routers are the global guide which sends traffic at the right place. They determine IP data to determine the destination.   A Router is a systems administration gadget that advances...View answers

Questions : 64 :: Does twisted pair cable do crosstalk? And if yes . why?

Yes they do crosstalk because twisted nature helps in electromagnetic induction and crosstalk in neighbouring pairs. Twisted Pair wires are contorted around one another to diminish impediment from...View answers

Questions : 65 :: What is Network Port?

The final step how physical layer works takes place at the end point on network links. Network ports are generally directly attached to the devices that makes up a computer...View answers

Questions : 66 :: Name a most common plug used by us.

RJ-45(REGISTERED JACK-45) RJ-45 is the most common port used by us. We often use this to connect USB devices, PD's and many more things. A RJ45 link is basically used to interface gadgets over an...View answers

Questions : 67 :: Brief on CSMA / CD.

CSMA (Carrier sense multiple access) is used to determine when the communication channels are clear and when the device is free to transmit the data.Carrier-sense multiple access is a media access...View answers

Questions : 68 :: Name any 5 types of networks.

1. PAN: Personal area network 2. LAN: Local area network 3. MAN: Metropolitan area network 4. WAN: Wide area network 5. GAN: Global area...View answers

Questions : 69 :: What are the benefits of VPN?

Connect offices at different geographical locations and it is very cheaper as compared to WAN. It is much secure encrypts the internet traffic and disguises online...View answers

Questions : 70 :: Explain DNS in the simplest language.

DNS is a Domain Name System. It is simply a decentralized system that translates the domain name to the respective...View answers
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