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Latest Ccna Interview Questions 2021

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By Author: NITS Global
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These questions are the asked in the interviews now as days for CCNA interviews. NITS GLOBAL experts have collected the questioners from the real interview given by the students to various IT companies. Hope it will help you to prepare.

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Can you define protocol?
Can you explain the concept of OSI layer?
Can you explain the different layers in OSI model?
Can you explain Application layer in OSI model?
Can you explain Presentation layer in OSI model?
Is it compulsory that compression, encryption and translation functions will be used during communication?
Can you explain Session layer in OSI model?
What's the concept of Simplex, Half Duplex and Full Duplex dialogs?
What are the different types of dialogs in Session layer?
Can you explain Transport layer in OSI model?
Can you explain the concept of Congestion?
Can you explain Network Layer?
Can you explain Data link Layer?
Can you explain the Physical layer?
Can you explain what an IP address ...
... is?
How to convert Decimal to Binary?
How many IP addresses can come in IPV4?
Can you explain the concept of Unicast IP address?
Can you explain the concept of IP multicasting or multicast IP
How many different types of subnet classful networks are present?
What are the IP address ranges for public and private IP address?
Why do we need class and how many different types of class exists?
How are the IP addresses distributed between different classes?
Can you explain what is classful IP addressing?
Can you explain the concept of subnetting?
Routing Questions
Can you explain the concept of DPU, Segments, Datagram, Frame and
What is IP datagram fragmentation and MTU?
Can you explain in detail with example how data fragmentation works?
Larger the IP datagram less the overhead, is it true or false?
What is the minimum size of MTU bytes?
Can you explain how optimal MTU size is calculated?
How does the IP message finally reassemble?
Can you explain the concept of Repeaters, Hubs, Bridges, Switches and
On what layers do router , switched , bridges and hubs operate ?
Can you explain the concept of Layer 3 switches?
what are CSU, DSU and TSU?
what are the basic components of the router?
Can you explain the WAN and LAN Interface in Routers?
What are DB-15, DB-60 and RJ-45 in CISCO routers?
Can you explain the concept of TTL?
What is the concept of ICMP packets?
Which operating system does CISCO have?
Can you explain the concept of NAT?
How is NAT implemented?
Can you explain how actually NAT works?
why does collision occur in HUBS and repeaters?
Can you explain the concept of Collision domain?
What is the concept of routing tables?
what is the use of route print?
Can you explain how in detail how routing table looks like?
How can you see route tables on the router?
Can you explain the concept of static and dynamic routing?
When to use Static routes and dynamic routes?
How do you configure static routes on a router?
Can you explain static default routes?
Firewall Questions
Can you define what a FIREWALL is?
What are the different types of firewalls?
Can you explain packet filtering firewall?
Can you explain circuit level gateway?
Can you explain stateful inspection?
What is Application Gateway?
Is NAT a firewall?
Are personal firewall actually firewalls?
Can you explain the concept of demilitarized zone?
What is the meaning of bastion host?
What are the different types of firewall architectures?
Can you explain dual home architecture?
Can you explain screened host architecture?
Can you explain screened subnet architecture?
What is the use of perimeter area?
What is IP spoofing and how can it be prevented?
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VPN Questions
Can you explain the difference between trusted and untrusted networks?
Can you define in short what VPN is?
What are the different types of VPN?
What requirements should a VPN fulfill?
How many ways are there to implement VPN architecture?
What are the different ways authentication mechanism in VPN?
Can you explain the basic of encryption in VPN?
what's the difference between Symmetric and Asymmetric cryptosystem?
what are the different symmetric algorithms?
What are the disadvantages of symmetric algorithms?
what are the different asymmetric algorithms?
Can you explain different components in PKI?
What is a digital certificate?
Can you explain tunneling?
what is the concept of HA and FA in VPN tunneling?
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More About the Author

NITS GLOBAL is the first choice for CCNA, CCNP Certification, CCIE Certification, Checkpoint Certification, Paloalto Certification, Cyber Security & Microsoft certification in India We offers top demanded training such as CCNA, CCNP Enterprise, CCNP Security, CCIE Enterprise Infrastructure, CCIE Security, Checkpoint CCSA, CCSE, Paloalto PCNSA, PCNSA, Azure, AWS, Linux and many more. NITS GLOBAL Head Quarter is based Pune (Maharashtra) we are Maharashtra’s Biggest Cisco & Microsoft Training provider having largest practice lab facility. We are well known for 100% Practical training’s and 100% Placement result institute. Over the last 10 Years we have trained and placed more than 5000+ happy students across the world.

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