Networking Interview Questions for Fresher

This article lists the most commonly asked interview questions with detailed answers for freshers.

What is a computer network?

A computer network is a group of computers that connect to share information and resources.

What is a node?

Any device that has its own network card and is connected to a computer network is considered a node. Printers, routers, switches, servers, and computers are some examples of nodes.

What is a client computer?

In a network, a computer that is used to access the shared resources is considered a client computer. A client computer is also known as a workstation.

What is a Subnet?

A Subnet is a section of a large network that uses the same individual subnet mask.

What is the difference between private IP addresses and public IP addresses?

Private IP addresses are reserved for local networks and cannot be accessed from a public network such as the Internet. Vice versa a public network cannot be accessed from a private IP address.

Following IP ranges are reserved for private IP addresses.

  • to
  • to
  • to

Public IP addresses are publicly accessible from any public network such as the Internet. To access a public IP address, we must use a public IP address.

Apart from private IP addresses, all IP addresses of class A, class B, and class C are public IP addresses.

What is the Active Directory?

On Windows servers, the active directory is a service that stores centralized information about network objects such as users, printers, etc.

How can the sequential zeros be summarized in IPv6?

An IPv6 is divided into eight separate sections. Instead of writing all leading zeros, we can write two colons. These two colons represent that everything between them is a zero. For example we can write an IPv6 address 0000:0000:0000:0000:0000:0000:0000:0001 as ::1.

What does CRC stand for?

CRC stands for the Cyclic Redundancy Check. It is an algorithm that detects errors in data transmission.

What is the difference between a broadcast domain and a collision domain?

A broadcast domain is a group of nodes in which all nodes can reach each other by sending broadcast messages at the data link layer.

A collision domain is a group of nodes in which data packets may collide with each other when they are being sent on a shared medium.

What is the ISO?

The ISO stands for International Organization for Standardization. It is a federation of over 100 standards organizations worldwide. It defines standards for computer networks. For example, one of the most popular models, the OSI model was developed by this organization. The official website of ISO is

What is the W3C?

The W3C stands for World Wide Web Consortium. It is an international organization that defines standards for websites and web technologies. The official website of W3C is

What is the use of a repeater?

A repeater is used to amplify the data signals. When the distance limit has been reached, instead of placing another switch, hub, or router in the path, a repeater is used. A repeater accepts data signals from one side, amplifies them, and retransmit from the other side.

At which layer of the OSI model does a router operate?

A router operates at layer3 of the OSI model.

Which standard defines the Token Ring?

Token Ring is defined in IEEE 802.5 standard.

Which connection method does Wireless 802.11b LAN use?

Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)

Which mechanism does Ethernet use to avoid the collision?

Carrier Sense Multiple Access/Collision Detection (CSMA/CD).

What is IEEE?

The IEEE (Institute of Electrical and Electronics Engineers) is an international non-profit, professional organization. It works for the advancement of the technology related to electricity. The official website of IEEE is

In a bus topology, which cable is used to connect a workstation with the backbone cable?

In a bus topology, Thinnet (RG58) cable is used to connect the workstation with the backbone cable.

What is the thickness of the Thinnet cable?

The thickness of the Thinnet cable is 0.25 inches.

What is the thickness of the Thicknet cable?

The thickness of the Thinnet cable is 0.5 inches.

Which connector is used to connect a Thinnet cable with NIC?

The BNC (British naval connector) connector is used to connect the Thinnet cable with NIC.

Which cable is used in Star topology?

A UTP cable is used in Star topology.

Which cable uses an RJ-45 connector?

A UTP cable uses an RJ-45 connector.

Which cable uses a BNC connector?

A Coaxial cable uses a BNC connector.

What is an area network?

An area network is a network that spans a specific geographic area. The following table lists important network types with descriptions.

Network Description
LAN Local Area Network (LAN) connects computers that reside in a small geographical area such as a building or campus.
WAN Wide Area Network (WAN) connects multiple LANs that are separated by a large geographical distance such as different continents.
MAN Metropolitan Area Networks (MAN) connects multiple LANs that are spanned in a metro city.
CN Content Network is used to cache and distribute the Internet traffic.
SAN Storage Area Network provides high-speed infrastructure between storage devices and file servers.
Intranet This is a private network. Outsiders are not allowed to connect in this network.
Extranet This network allows certain services from the Intranet to known external users.
Internet This network allows unknown external users to connect with internal resources of the network such as web servers.
VPN This network provides secure connection across the public network such as the Internet.

What are the basic features of 10Base2 Ethernet architecture?

Basic features of 10Base2 Ethernet architecture are following: -

  • It is used in Bus Topology.
  • It uses Thinnet coaxial cables.
  • The maximum speed of this architecture is 10Mbps.
  • It uses a Baseband transmission.
  • Theoretically, it supports 200 meters but practically, it will support only 185 meters distance because this architecture uses Thinnet coaxial cables that support only 185 meters.
  • There can be 30 nodes in each segment.
  • There must be a distance of 0.5 meters between two hosts.

What are the basic features of 10Base5 Ethernet architecture?

Basic features of 10Base5 Ethernet architecture are following: -

  • It uses Baseband technology for data transmission.
  • It provides maximum 10Mbps speeds.
  • It is used in Bus topology.
  • It uses Thicknet coaxial cables.
  • It supports 500 meters distance per segment.

What does the term topology define?

The term topology defines how the devices are connected. There are two types of topology; physical and logical.

How will you consider a topology which uses HUB as a centralized device to connect all computers?

Physically, it will be considered a star topology but logically, it will be considered a bus topology.

In a Ring topology network, a cable that connects two devices is broken. Will the remaining devices work normally?

No, the network will not work. Since Ring topology does not build a redundant path for the backup, the entire network will be down if there is a break in the cable.

Is bus topology still used in computer networks?

No, bus topology is no longer used in computer networks.

Where do we use the cross-over cable?

The Cross-over cable is used to connect the following: -

  • Hub/Switch to Hub/Switch
  • System to System
  • Router to Router
  • Router to System

networking interview questions for fresher

What are the main advantages of a star topology?

The main advantages of star topology are scalability, stability, and reliability. Adding and removing a device in this topology is much easier than the other topologies. Apart from it, since each device in this topology connects to a centralized device with its own individual cable, it is more stable in comparison to other topologies. In this topology, a break in the cable only affects the connected device.

What are the main disadvantages of a star topology?

The main disadvantages of star topology are cost and the use of centralized network components. Cables and components used in this topology are a little bit more expensive in comparison to the cables and components used in other topologies. Besides it, it depends on a centralized hub or switch for connectivity. If that hub or switch fails, the entire network will be down.

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