Networking technical interview questions and answers are essential for anyone preparing for IT support, system administration, or network engineering roles. In most companies, networking is the backbone of communication, security, and server operations, which is why recruiters evaluate candidates on core concepts like OSI Model, TCP/IP, protocols, IP addressing, routing, switching, and troubleshooting. Whether you are a fresher or an experienced candidate, mastering networking topics helps you perform confidently during technical rounds. These questions are commonly asked in companies like TCS, Wipro, Infosys, Accenture, Cognizant, and Capgemini during campus placements and lateral hiring. In this guide, you will learn frequently asked networking interview questions with answers, simple explanations, and practical examples. You can also download PDFs and practice mock interview sets to strengthen your preparation for both technical interviews and placement tests.
Showing 10 of 66 questions
31. What is the minimum and maximum length of the header in the TCP segment and IP datagram?
The header should have a minimum length of 20 bytes and can have a maximum length of 60 bytes.
32. What is the range of addresses in the classes of internet addresses?
Class A 0.0.0.0 - 127.255.255.255
Class B 128.0.0.0 - 191.255.255.255
Class C 192.0.0.0 - 223.255.255.255
Class D 224.0.0.0 - 239.255.255.255
Class E 240.0.0.0 - 247.255.255.255
33. What is the difference between TFTP and FTP application layer protocols?
The Trivial File Transfer Protocol (TFTP) allows a local host to obtain files from
a remote host but does not provide reliability or security. It uses the fundamental packet
delivery services offered by UDP.
The File Transfer Protocol (FTP) is the standard mechanism provided by TCP / IP for copying a file from one host to another. It uses the services offer by TCP and so is reliable and secure. It establishes two connections (virtual circuits) between the hosts, one for data transfer and anot
34. What are major types of networks and explain?
Peer-to-peer network, computers can act as both servers sharing resources and as clients using the resources.
Server-based networks provide centralized control of network resources and rely on server computers to provide security and network administration
35. What are the important topologies for networks?
BUS topology:In this each computer is directly connected to primary network cable in a single line.
STAR topology:In this all computers are connected using a central hub.
RING topology:In this all computers are connected in loop.
36. What is mesh network?
A network in which there are multiple network links between computers to provide multiple paths for data to travel.
37. What is difference between baseband and broadband transmission?
In a baseband transmission, the entire bandwidth of the cable is consumed by a single signal. In broadband transmission, signals are sent on multiple frequencies,allowing multiple signals to be sent simultaneously.
38. Explain 5-4-3 rule?
In a Ethernet network, between any two points on the network ,there can be no more than five network segments or four repeaters, and of those five segments only three of segments can be populated.
39. What MAU?
In token Ring , hub is called Multistation Access Unit(MAU).
40. What is the difference between routable and non- routable protocols?
Routable protocols can work with a router and can be used to build large networks. Non-Routable protocols are designed to work on small, local networks and cannot be used with a router