Networking Interview Questions for Fresher

Cracking a networking job interview is one of the toughest tasks which fresher faces. This article helps the fresher by listing the most commonly asked interview questions with details answers in networking job interview.

What is a computer network?

A computer network is a group of computers those are connected with each other for sharing information and resources.

What is a node in computer network?

Any device which is connected to a computer network is considered as a host or a node. It can be a computer or a device with its own network card such as printer or router.

Which computer is considered a client computer in network?

The computer which is used to access the shared resources in network is considered a client computer. Client computer is also known as workstation.

What is a Subnet?

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

What are the difference between private IP address and public IP address?

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

Following IP ranges are reserved for private IP addresses.

  • 10.0.0.0 to 10.255.255.255
  • 172.16.0.0 to 172.31.255.255
  • 192.168.0.0 to 192.168.255.255

Public IP addresses are publicly accessible from any public network such as Internet. In order to access a public IP address, we must have to use a public IP address.

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

This article is the first part of the article “Collection of Networking Questions with Answer for Beginners”. Other parts of this article are following.

Basic Networking Interview Questions with Answers

Networking Interview Questions and Answers

Networking Interview Questions for Experienced

Top 100 Networking Interview Questions with Answers

What is the Active Directory?

Active directory is a service in Windows server that stores centralized information about network objects such users, printers, etc.

How can the sequential zeros be summarized in IPv6?

An IPv6 is divided in eight separate sections. Instead of writing all leading zeros, we can write two colons. These two colons represents 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 Broadcast domain and Collision domain?

Broadcast domain is that group of nodes in which all nodes can reach to each other by sending broadcast message at data link layer.

Collision domain is that group of nodes in which data packets can collide with each other when are being sent on a shared medium.

What is the ISO?

The ISO stands for International Organization for Standardization. It is a federation of more than 100 standards organizations from throughout the world. It defines standards from computer networks. For example, one of the most popular models, the OSI model was developed by this organization. The official website of ISO is the www.iso.org.

What is the W3C?

The W3C stands for World Wide Web Consortium. It is an international organization that defines the standards for websites and web technologies. The official website of W3C is the www.w3c.org.

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. Basically a repeater accepts data signal from one side, amplifies them and retransmit from other side.

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

A router operates at layer2 of 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 the www.ieee.org.

Which cable is used to connect a workstation with backbone cable in bus topology?

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

What is the thickness of the Thinnet cable?

The thickness of the Thinnet cable is 0.25 inch.

What is the thickness of the Thicknet cable?

The thickness of the Thinnet cable is 0.5 inch.

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?

UTP cable is used in star topology.

Which cable uses RJ-45 connector?

UTP cable uses RJ-45 connector.

Which cable uses BNC connector?

Coaxial cable uses BNC connector.

What is an area network?

An area network is a network that spans in a specific geographic area. Following table lists important network types with description.

Network Description
LAN Local Area Network (LAN) connects computers which reside in a small geographical area such as building or campus.
WAN Wide Area Network (WAN) connects multiple LANs which are separated by a large geographical distance such as different continents
MAN Metropolitan Area Networks (MAN) connects multiple LANs which are separated 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 Intranet to known external users.
Internet This network allows unknown external users to connect with internal resources of network such as web server.
VPN This network provides secure connection across the public network such as 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 cable.
  • Maximum speed of this architecture is 10Mbps.
  • It uses Baseband transmission.
  • Theoretically it supports 200 meter but practically it will supports only 185 meter distance because this architecture uses Thinnet coaxial cable that supports only 185 meter.
  • There can be 30 nodes in each segment.
  • There must be a distance of 0.5 meter 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 cable.
  • It supports 500 meter distance per segment.

What does the term topology defines in computer network?

The term topology defines how the devices are connected with each other in network. 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 Ring topology a cable, which connects two devices, is broken. Will remaining devices work normally?

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

Is bus topology still used in computer network?

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

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 star topology?

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 centralized device with its own individual cable, it more stable in comparison of other topologies. In this topology, a break in cable only affects the connected device.

What are the main disadvantages of star topology?

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

That’s all for this part. In next part, we will take more networking interview questions with answers. If you have any suggestion, comment or feedback about this article, please mail me. If you like this collection, please do not forget to share it from your favorite social platform.

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