Networking Interview Questions and Answers

Seeking Networking interview questions and answers, here is the largest collection of the most frequently asked questions and answers in networking interviews.

What is a password?

A password is a secret word that is used to prove the identity of a user in the authentication process. A resource secured by the authentication process can be accessed only by providing the correct password.

What is the UAC?

It is a security feature on Windows systems that prevents unauthorized applications from running without user permission.

At which port does HTTP operate?

HTTP operates at port 80.

At which port does HTTPS operate?

The HTTPS operates at port 443.

What does DHCP stand for?

DHCP stands for Dynamic Host Configuration Protocol. Every node on an IP network needs an IP address to communicate with others. If the number of nodes is high, then assigning and managing IP addresses becomes very difficult. DHCP solves this issue. Once DHCP is configured on the network, nodes automatically get IP addresses from it.

What does the DNS stand for?

DNS stands for Domain Name System. It is used to map a name with a numeric address. Electronic devices (such as computers and phones) use numeric identities (such as phone numbers and IP addresses) for addressing. DNS maps these numeric identities with names.

What is an Encoder?

Any device or software which prepares data for transmission is considered an Encoder.

What is a Decoder?

Any device or software which converts the encoded data to its actual format is considered a Decoder.

What does the Physical layer define?

The physical layer defines the standards and protocols for the media and devices which are used to connect the devices physically in the network. It addresses only those equipment and technology which work with electronic signals such as NICs, connectors, repeaters, and cables.

Any device which handles data in other formats apart from signal (analog and digital) format is not covered by the physical layer. For example, Hubs and Switches both are used to connect multiple computers. But a Hub is considered as a physical layer device while a switch is considered as a Data Link layer device. The reason being, a Switch handles data in the frame format while a Hub handles data in the signal format.

In which layers of the OSI model, does Ethernet work?

Ethernet works in the first two layers of the OSI model. These layers are the Physical layer and the Data Link layer.

What does the term packet define in the OSI model?

The term packet is used to express the encapsulated data that is transmitted and received at the network layer.

What is the POP?

POP (Post Office Protocol) is a protocol. It is used in the email system by the client computer to retrieve emails from the email server.

Based on the network relationship, how many types of networks are there?

Based on the network relationship, there are two types of networks: peer-to-peer and client/server.

What is the Encapsulation?

Encapsulation is the process of packing data for transportation.

What is a peripheral?

A peripheral is a device or hardware that is added to a computer to add additional functionality or to improve existing functionality.

What does the 10Base5 stand for?

In 10Base5 architecture, 10 stands for speed, Base stands for Baseband transmission, and 5 stands for 500 meters distance.

Which standards are used in Gigabit Ethernet?

IEEE802.3z and IEEE802.3ab standards are used in Gigabit Ethernet.

What do the standard IEEE802.3z define?

IEEE802.3z standards define the following Gigabit Ethernet implementations: -

  • 1000BaseSX (1000Mbps speed, MMF Fiber optical cable, 550Meter maximum distance)
  • 1000BaseLX (1000Mbps speed, SMF Fiber Optical cable, 3Kilometers distance)
  • 1000BaseCX (1000Mbps speed, coaxial cable, 25meter distance)

What does an access method describe?

An access method describes how a computer transmits data in the network.

What are the differences between different Ethernet architectures based on speed, distance, and cable?

The following table compares different Ethernet architectures based on speed, distance, and cable.

Architecture Speed Distance Cable
10Base2 10Mbps 185 Meter Thinnet Coaxial cable
10Base5 10Mbps 500 Meter Thicknet Coaxial cable
10BaseT 10Mbps 100 Meter UTP CAT-3 cable
100BaseTX 100 Mbps 100 Meter UTP CAT-5 cable
100BaseFX 100 Mbps 100 Meter Fiber optical cable
1000BaseSX 1000 Mbps 550 Meter MMF fiber optical cable
1000BaseLX 1000 Mbps 3 Kilometer SMF Fiber optical cable
1000BaseCX 1000 Mbps 25 Meter Coaxial cable
1000BaseTX 1000 Mbps 100 Meter UTP CAT5e or CAT6 cable
10GBaseSR 10 Gbps 100 Meter Short-range MMF Fiber optical cable
10GBaseLR 10 Gbps 10 Kilometer Long-range MMF Fiber optical cable
10GBaseER 10Gbps 40 Kilometer Extra-long SMF fiber optical cable
10GBaseT 10 Gbps 100 Meter UTP CAT6 cable

What is the maximum distance limit of a UTP cable?

The distance limit of a UTP cable is 100 meters.

Which cable is required to build a 100BaseT network?

To build a 100BaseT network, UTP (CAT-5) cables are required.

How much distance does an SMF (single-mode fiber) cable support?

An SMF cable supports a maximum distance of 2 km.

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 connector is used to connect a Thicknet cable with NIC?

The AUI (Adapter unit interface) connector is used to connect the Thicknet cable with NIC.

How is a straight-through UTP cable made?

In a Straight-through UTP cable, all pins are matched on both sides. Pin-1 connects with Pin-1; Pin2 connects Pin2, and so on. Each pin on one side connects with the same number of the pin on another side.

Networking Interview Questions and Answers

Based on the geographical location, what are the two most common network types?

LAN (Local Area Network) and WAN (Wide Area Network)

What is the difference between point-to-point topology and point-to-multipoint topology?

In a point-to-point topology, one system connects with another system directly. In point-to-multipoint topology, all systems connect through a centralized device.

Where is Mesh topology used?

Mesh topology is used in WAN networks to build alternative paths between networks.

What is the main advantage of Mesh topology?

It creates redundant links between nodes that keep alive the network till the last active link.

Why a system cannot monopolize the Token Ring LAN?

Each system gets the token only for a specific period. Once that period is expired, it must have released the token.

What are the differences between TFTP and FTP?

TFTP (Trivial File Transfer Protocol) uses the UDP protocol for data transmission. It neither uses an authentication process before transmission nor uses any mechanism to ensure data integrity throughout the transmission.

FTP (File Transfer Protocol) uses TCP protocol for data transmission. It not only uses an authentication process before transmission but also uses several mechanisms to ensure data integrity throughout the transmission.

TFTP is built only to use in the private network between known devices. It should be never used in the public network.

FTP is built for both public and private networks. It can be used in both networks without any hassle.

What is the 10BaseFL architecture?

The 10BaseFL is the extended version of 10BaseT architecture. It uses fiber optic cable instead of UTP cable. Usually, this architecture is used to build the backbone network.

What are the similarities and differences between 100BaseTX and 100BaseFX?

Similarities: - Both architectures use Baseband technology for data transmission and provide a maximum speed of 100Mbps.

Differences: - 100BaseTx uses UTP (CAT-5) cable while 100BaseFX uses fiber optical cable.

What are the differences between the STP cable and the UTP cable?

STP cable has an additional layer of insulation on each pair of twisted wires that protects the quality of signals in the wires. On the positive side, STP cable is more reliable. On the negative side, it is more expensive in comparison to UTP cable.

What are the differences between the single-mode fiber optic cable and the multimode fiber optical cable?

SMF (Single Mode Fiber) cable uses a single ray of light to carry the signals while MMF (Multi-Mode Fiber) cable uses multiple rays of light to carry the multiple signals simultaneously.

What is the Crosstalk?

Crosstalk is the interference that generates from adjacent wires.

What is the distance limit of 10Base2 Ethernet?

Theoretically, it supports 200 meters distance. Practically, it supports only 185 meters. Because of, it uses ThinNet coaxial cable that has a distance limitation of 185 meters.

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