CCNA Basic Questions for Interview – Blog Title

CCNA Basic Questions for Interview

Are you preparing for a CCNA interview and looking for some basic questions to brush up on your knowledge? In this article, we have compiled a list of common CCNA interview questions that can help you prepare for your upcoming interview. Whether you are a fresh graduate or an experienced professional, these questions will test your understanding of the fundamental concepts and principles of CCNA.

1. What is the purpose of a subnet?

A subnet is a logical subdivision of an IP network. Subnetting helps in dividing a large network into smaller, more manageable networks. It enables efficient utilization of IP addresses and improves network performance by reducing network congestion and broadcast traffic.

2. What is the difference between a switch and a router?

A switch operates at Layer 2 of the OSI model and is used to connect devices within a local area network (LAN). It forwards data based on MAC addresses. On the other hand, a router operates at Layer 3 and is used to connect multiple networks together. It forwards data based on IP addresses.

3. What is the purpose of a VLAN?

A VLAN (Virtual Local Area Network) is a logical grouping of devices on a network, regardless of their physical location. VLANs help in enhancing network security, improving performance, and simplifying network management by isolating traffic and controlling communication between devices.

4. Explain the process of ARP (Address Resolution Protocol).

ARP is used to map an IP address to a MAC address in a LAN. When a device wants to communicate with another device on the same subnet, it first checks its ARP cache to find the MAC address corresponding to the IP address. If the MAC address is not found, it sends an ARP request to broadcast, asking the device with the corresponding IP address to respond with its MAC address.

5. What is the purpose of the default gateway?

The default gateway is the IP address of the router that connects a local network to external networks, such as the internet. It acts as the exit point for all traffic that is destined for destinations outside the local network. It enables devices within the network to communicate with devices in other networks.

6. What is the difference between TCP and UDP?

TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are two transport layer protocols. TCP provides reliable, connection-oriented communication with error checking, sequencing, and flow control. UDP, on the other hand, provides unreliable, connectionless communication without error checking or flow control. TCP is suitable for applications that require guaranteed delivery of data, while UDP is used for applications that prioritize speed and efficiency over reliability.

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