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Basic Networking Interview Questions and Answers

Question: What is a broadcast and a collision domain?
Ans: A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer whereas a collision domain is a section of a network where data packets can collide with one another when being sent on a shared medium or through repeaters.

Question: What is the range of Class A, Class B and Class C IP Address?
Ans:  The following are the range of Class A, Class B and Class C IP Address.
Class A range starts from to – It supports 16 million hosts on each of 127 networks.
Class B range starts from to – It supports 65,000 hosts on each of 16,000 networks.
Class C range starts from to – It supports 254 hosts on each of 2 million networks.

Question: What is PoE (Power over Ethernet)?
Ans: Power over Ethernet or PoE is a technology which pass electrical power along with data on Ethernet cabling. This allows a single cable to provide both data connection and electrical power to devices such as IP Cameras or Wireless Access Points.

Question:  What is the difference between tracert and traceroute?
Ans:  Traceroute command is used on a router or a switch where as tracert command would be used in a PC.

Question: What is Round Trip Time?
Ans: Round-trip time (RTT) is also termed as round-trip delay which is the time required for a packet to travel from a specific source to a specific destination and back again.

Question: What are the different types of cable?
Ans: The following are the different types of cable –
Straight cable – To connect different group devices (Switch, Router etc)
Cross Cable – To connect same group device (PC –PC, Switch –Switch, Router-Router)
Rollover cable – To connect Console port to Computer

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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.