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Basic Networking Interview Questions and Answers

Question:  What is Public IP Address and Private IP Address?
Ans: A public IP address is an IP address that can be accessed over the Internet. Private IP address on the other hand is used to assign computers within your private space without letting them directly expose to the Internet.

Question: What are the ranges of Private IP Address?
Ans: The following defines the ranges of Private IP Address.
A Class = –
B Class = –
C Class = –

Question: What is Spanning tree  protocol?
Ans: STP or Spanning Tree Protocol is used to avoid looping in a switch. STP will have two bridges i.e., Root bridge and Non-Root bridge. Root bridge connects the port are called root ports where as Non-Root bridge connects the ports are called a s designated port.

Question: What are the different states in Spanning Tree Protocol?
Ans: The following are the different states in Spanning Tree Protocol:

Question: Which protocol switch use for filling its MAC-Table?
Ans: Switch uses ARP – Address Resolution Protocol to fill its Mac-Address.

Question: What is the difference between half duplex and full duplex?
Ans: In full duplex, sender can be multiple whereas in half duplex, sender should be one

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Electrical Engineer CCNA Collaboration CCNA Voice CCNA R&S. I'm Electrical Engineer and I work like Support Engineer for a Telephony Service Provider Company. Before that I had position like Pre-Sale Engineer about small and medium multivendor telephony solutions. I have 5 years of experience working in Telephony Multivendor Projects. I am also 3 years of experience working in Support and implementation about Cisco Collaboration platforms: UCS server, UCM, Cisco Unity, Presence Server, Jabber, Gateway. Support Community is most useful in finding design, implementation and support tricks and shortcuts that greatly help me in my daily activities. If you need to contact me, please you can writte me.


CCNA Routing and Switching
Am a technology enthusiast. I work in network support providing support with implementation, maintaining and precisely troubleshooting the infra.
Realm of collaboration makes me want to learn and face new challenges more and more.