CCNA is an associate level certification that validates your ability to troubleshoot, configure and fix enterprise network problems. Cisco hosts the accreditation, which is the largest vendor of network equipment. Cisco equipment is used in large enterprises’ network infrastructure. CCNA certification is a great way to get a job as a networking professional in the IT sector. You may be eligible for positions as a Network Support Engineer, Technical Support Expert, Network Administrator, Hardware and Networking Engineering Engineer, and many other IT jobs. If you are planning to prepare for the CCNA Interview then you have come to the right place.

Here are the top 20 CCNA interview questions and answers that can help you get the job.
1) What is the OSI model in networking? Answer: OSI stands for open systems interconnection model. It is a reference model that demonstrates how applications communicate in a network. It has 7 layers.
Layer 1: PhysicalLayer 2, DatalinkLayer 3, and NetworkLayer 4, respectively. Layer 5: TransportLayer 5, SessionLayer 6, and PresentationLayer 7, respectively.
2) What is RIP?Answer RIP stands for Routing Information Protocol. It is also known by Interior Gateway Protocol (IGP). It is a distance-vector protocol which uses hop count to determine the best route between the sender (or receiver) and the receiver.
3) What is the difference in a collision domain and broadcast domain? Answer: Collision domain: When two devices attempt to send data simultaneously, there will be a collision. This will cause them to wait and then re-transmit their data. When two devices in a network transmit information, the collision domain must take care of all devices in the network. This happens only when the mode is half-duplex.
Broadcast domain: This is the logical division within the network domain where information is broadcast. Broadcast domains include all devices that receive broadcast traffic.
4) What is Half-duplex and full-duplex transmission modes?Answer to: Half-duplex: Two devices are connected by a network cable. These devices can communicate in both directions, but only in one direction.
Full-duplex: Two devices can be connected to each other using a network cable in a point-to–point system. They can also communicate with one another in both directions simultaneously.
5) Explain the difference between public and private IP addressing. Your computer’s public IP address allows you to secure your server using FTP, VPN, WEB, and other protocols. Public IP allows you to set up any server at home and publish it on the Internet.
A system’s private IP address is the address used to communicate with other systems within the same network. Private IPs cannot be loaded on the Internet and data cannot not be sent to them via the Internet. It only works within the local network.
6) What is the difference in Unicast, Multicast and Broadcast? Answer: A unicast transmission is a single data packet that is sent from one source to one destination on the network.
Broadcast is a single data packet that is sent to all destinations in the network.
Multicast is similar to broadcast, but you must be a member the multicast group.
Anycast sends the data to the nearest network node. The node initiates another anycast to its nearest Node.
7) What are the differences between straight-through and cross-over cables?Answer: Straight-through: It can be used when you want two different types devices to be connected. It is the most common cable format for network cables. It is the most commonly used cable format for network cables.