Here's a list of essential fundamental core networking interview questions. Great for improving your skills and getting ready for interviews, this collection is a helpful resource for mastering networking basics.
- Define Network?
- What are the different types of a network? Explain each briefly.
- What is a gateway?
- What is a Protocol?
- Why subnetting is required?
- What is Routing?
- Explain difference between Router & Switch?
- What are the types of MAC Addresses?
- What is the difference between Private IP and Public IP?
- What is the range of private & public ip address?
- What is the difference between broadcast domain and collision domain?
- What is ping? for what purpose we use ping?
- Define Unicasting, Multicasting and Broadcasting and Any casting?
- What are the differences between static ip addressing and dynamic ip addressing?
- What is the difference between the Internet, Intranet, and Extranet?
- What is AS (Autonomous System)?
- What is AD (Administrative Distance)?
- Differentiate full-duplex from half-duplex?
- List the layers of OSI?
- Routers work at which OSI layer?
- Switches work at which OSI layer?
- What is the difference between TCP and UDP?
- In which layer term "Frames" is used?
- In which layer term "Packets" is used?
- In which layer term "Segments" is used?
- What is CRC?
- What is the way to establish a TCP connection?
- What is the difference between RIPV1 & RIPV2?
- What is the administrative distance of RIP?
- What is Route Poisoning & Split Horizon in RIP?
- How do we configure RIP?
- What is EIGRP?
- Why EIGRP is called hybrid protocol?
- What are the different tables in EIGRP?
- What are the different packets in EIGRP?
- What is meant by active and passive states in EIGRP?
- What is the different K-values used in EIGRP?
- What is successor?
- What are different route types in EIGRP?
- How do we configure EIGRP?
- What is OSPF?
- What are area types?
- What Is Backbone Area?
- Explain Area Border Router(ABR)?
- What are LSA types?
- What Is the Default Hello Interval?
- What are different neighbor states in OSPF?
- Briefly explain functioning and working of different OSPF?
- What are the different OSPF network types?
- Name tables which OSPF maintain?
- How OSPF DR & BDR Is Elected?
- What Parameters Must Match for Two Routers to Become Neighbors?
- How Do We Configure OSPF Routing Protocol?
- What is the layer 2 loop?
- What is Spanning tree protocol?
- How STP works?
- Define selection criteria of STP root bridge?
- How does STP maintain a loop-free network?
- What is the basics function of BPDU?
- What are the different types of BPDU?
- What is the STP blocking state?
- What is the STP Forwarding state?
- What is Difference between STP and RSTP?
- Which command enables RSTP on a switch?
- What is the method of selecting a root port?
- What are the different states of ports in STP?
- Explain different types of STP Timers?
- How do we configure STP?
- Which switching technology reduces the size of a broadcast domain?
- What are the benefits of creating VLANs?
- What type of traffic goes through native VLAN?
- What is difference between Trunk and Access mode?
- What is Inter-Vlan Routing?
- What are the different VLAN Frame tagging techniques?
- What is QinQ?
- Give the commands to create VLANs?
- What is VTP?
- What is the benefit of VTP?
- What are the VLAN Trunking Protocol (VTP) Modes?
- What is VTP Transparent Mode?
- What is a VTP configuration revision number?
- What is VTP Pruning?
- What is a VPN?
- Explain DHCP briefly?
- Briefly describe NAT
- What are firewalls?
- What is traceroute?
- What is ICMP?
- What are IGPs and EGPs and why are they different?
- What is the purpose of BGP?
- Name several path attributes and their function.
- What is the global routing table?
- What is the Port Number of BGP?
- What is the BGP path selection criteria?
- What is route reflector and why it is required?
- What is synchronization in BGP?
- What is Finite State Machine (FSM)?
- what is difference between access list and prefix list?
- What is MPLS?