Networking Interview Questions & Answers

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What are the two types of transmission technology available?

The two types of transmission technology are – broadcast and point-to-point.

What is DNS?

The Domain Name System (DNS) is a central part of the Internet, providing a way to match names (a website you’re seeking) to numbers (the address for the website). Anything connected to the Internet – laptops, tablets, mobile phones, and websites – has an Internet Protocol (IP) address made up of numbers.

Explain ‘hidden shares’.

A hidden or an administrative share is a network share that is not visible when viewing another computer’s shares.

What is a ‘client’ and ‘server’ in a network?

Clients and servers are separate logical entities that work together over a network to accomplish a task.

What are the different ways to exchange data?

1. Simplex
2. Half-duplex
3. Full-duplex

What is a ‘frame relay’ and in which layer does it operate?

A frame relay is a packet-switching technology. It operates in the data link layer.

What is a MAC address?

A MAC (Media Access Control) address is the 48-bit hardware address of a LAN card and is usually stored in the ROM of the network adapter card and is unique.

What is an IP address?

An Internet Protocol address (IP address) is a numerical label assigned to each device (e.g., computer, printer) participating in a computer network that uses the Internet Protocol for communication.

Differentiate between a ‘bit rate’ and ‘baud rate’.

A bit rate is the number of bits transmitted during one second, whereas, baud rate refers to the number of signal units per second that are required to represent those bits.
Baud rate = bit rate / N, where N is the no. of bits represented by each signal shift.

What is Project 802?

It is a project started by IEEE to set standards to enable intercommunication between equipment from a variety of manufacturers.

What is ICMP?

ICMP (Internet Control Message Protocol) is a network layer protocol of the TCP/IP suite used by hosts and gateways to send notification of datagram problems back to the sender.

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 other.

What are the types of LAN cables used?

There are two types of LAN cables used – ‘Cat 5’ and ‘Cat 6.’ Cat 5 can support 100Mbps of speed while Cat 6 can support 1Gbps of speed

What is a ‘cross table’?

This is a type of connection between same types of devices without using a hub/switch so that they can communicate.

A gateway works in which layer of the OSI model?

Transport layer.

Differentiate between ‘forward lookup’ and ‘reverse lookup’ in DNS?

Converting names to IP addresses is called forward lookup.
Resolving IP addresses to names is called reverse lookup.

What is a ‘backbone network’?

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

What are the criteria for the best path selection of a router?

The following parameters define the path selection:
1. Longest prefix match
2. Minimum AD (administrative distance)
3. Lowest metric value

What is the difference between ‘standard’ and ‘extended’ ACL (access control list)?

Standard ACLs are source-based, whereas extended ACLs are source- and destination-based.

What is NIC?

NIC (Network Interface Card) 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 network.