CCNA Interview Questions and Answers
The abbreviation of the CCNA is Cisco Certified Network Associate which is a certification course for the people who want to make their careers in IT. We have tried to cover all the most frequently asked CCNA interview questions. This is an associate-level course which means freshers can also apply for that. With this certification, networking experts can enhance their knowledge in the aspects of configuring and troubleshooting network issues.
Once you have achieved your certification, now you have to prepare yourself for the interview. Here in this article, we have listed the best CCNA interview questions, which are going to help you in cracking your interview.
Most Frequently Asked CCNA Interview Questions
Here in this article, we will be listing frequently asked CCNA Interview Questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.
A network is a system of interconnected devices that communicate using some protocols (or standards) to exchange resources and services.
Note: This is one of the CCNA basic interview questions usually asked in the HR round.
In the OSI model, seven layers are there:
- Physical Layer
- Data Link Layer
- Network Layer
- Transport Layer
- Session Layer
- Presentation Layer
- Application Layer
Note: OSI model and TCP IP model questions are one of the most asked questions among the CCNA interview questions. Study both of them in detail.
The IP address has 2 versions available today. IPv4 and IPv6.
- IPv4 is 32 bits or 4 bytes.
- IPv6 is 128 bits or 16 bytes.
A hardware device that filters and transfers network data packets from one device to another is called a switch. Switches are intelligent as they find the shortest way to transfer data packets and you can transfer data to a particular host instead of sending it to all connected devices.
Switches are used for sharing resources by connecting all the devices like servers, computers, scanners, etc where they can communicate with each other.
| Switches | Routers | Hub |
|---|---|---|
| Datalink layer | Network layer | Physical layer |
| They are used in LAN | They are used in LAN, MAN, and WAN | They are used in LAN |
| It has the speed of 1Gbps | It has the speed of 1-100Mbps in case of wireless 100Mbps-1Gbps in case of wired | It has the speed of 10Mbps |
Network congestion is a poor quality of networking service that occurs when a channel or link carries more data than it can handle. This results in data packets loss, queuing delays, and blocking of new network connections.
| LAN | MAN | WAN |
|---|---|---|
| The abbreviation for LAN is Local Area Network | The abbreviation for MAN is Metropolitan Area Network | The abbreviation for WAN is Wide Area Network |
| It is limited to small areas like schools, colleges, hospitals, etc. | It covers towns, cities, etc. | It has a much larger radius than a LAN and WAN and establishes communication between countries. |
| The transmission speed is fast in LAN | The transmission speed is average | It has a low transmission speed |
| Design and maintenance are easy | Design and maintenance are difficult compared to LAN. | Design and maintenance are very difficult. |
PING is a networking utility that is used to check whether the host is reachable over a network or not.
| Static IP Address | Dynamic IP Address |
|---|---|
| Static IP Address does not change with time. | Dynamic IP Address changes with time. |
| It is less secured. | It is very secured because of its volatility. |
| Devices that use Static IP addresses can be tracked easily. | Devices that use Dynamic IP address is difficult to track. |
| Highly stable but costly. | Less stable but cheaper. |
There are 4 types of memories in a Cisco Router.
- RAM (Random Access Memory)
- ROM (Read Only Memory)
- NVRAM (Non-Volatile Random Access Memory)
- Flash Memory
Different types of cables are:
- Coaxial cable
- Optical fiber cable
- Twisted Pair cable
Peer to peer networking or you can say P2P networking is the shared application architecture that segregates the tasks or the workloads among peers.
The PoE (Power over Ethernet) is a technology where a single cable is used to transfer both the data and the power supply at the same time. A twisted-pair Ethernet cable is used to supply electric power with data.
| Collision Domain | Broadcast Domain |
|---|---|
| It is a section of a network that is connected by the shared mediums. | It is a logical division of the computer network. |
| It sends the data through the Network segment | It sends the data through the LAN segment |
| Collision in the network occurs when more than a single device tries to send the packets. | Congestion in the segment increases when more than a single device tries to send the packets. |
Round Trip Time is the time (millisecond) taken by a network request to move from the starting point to its destination and return to its starting point again. RTT diagnose the speed and reliability of a network and is an important metric to find out how long it will take to make the complete trip.
Sir I usually performs various factors:
User configuration, Network Configuration, Management of packages like PHP, MongoDB, Nginx, pear, etc. , Installation and configuration update, configuring NTP server, Configuring firewalls and iptables, securing SSH, Hardening by configuring Daemon, Kernel hardening by SELinux, and set up logging.
| Bit rate | Baud rate |
|---|---|
| The number of bits transmitted per second is called Bit Rate. | The number of signals per second is called the Baud Rate. |
| It improves computer efficiency. | It improves data transmission. |
| Bit rate = Baud rate × Number of bits per baud. | Baud Rate = Bit rate / Number of bits per baud. |