He gestured to her drawing. "A , however, operates at Layer 3—the Network layer. It connects different networks together. It routes data packets between them using IP addresses. If the switch is the mail sorter inside the office, the Router is the post office that sends mail out to other cities."
"And the hosts?" Sarah pressed.
She walked back to her desk and sat down, leaning back in her chair. "Let's talk about your CCNA studies. Everyone memorizes the OSI model, but few understand it. " ccna interview questions and answers
Rahul thought about the hierarchy of needs. He gestured to her drawing
Ready to create a quiz? Use Canvas to test your knowledge with a custom quiz Get started A CCNA (Cisco Certified Network Associate) interview typically covers a broad range of networking fundamentals, from the OSI model to advanced routing protocols like OSPF and EIGRP. Below is a comprehensive collection of questions and answers categorized by topic, as found in major interview prep guides. 1. Networking Fundamentals & OSI Model What is the purpose of the Data Link Layer? It ensures data reaches the correct device on a local network by framing data and controlling access to the physical medium [2, 23]. It also handles error detection and physical (MAC) addressing [20]. Explain the difference between a Hub, Switch, and Router. Hub: A Layer 1 device that broadcasts data to all ports, leading to many collisions [11, 23]. Switch: A Layer 2 device that filters and forwards frames based on MAC addresses, creating separate collision domains for each port [11, 20]. Router: A Layer 3 device that forwards data packets between different networks using IP addresses and routing tables [7, 11, 23]. What is a "Window" in networking? It refers to the number of segments a source can send before it must receive an acknowledgment from the destination, which helps manage flow control [1, 14, 20]. What is Network Latency? The time delay between when a data packet is sent and when it is received by the destination. It is influenced by factors like bandwidth, distance, and congestion [1, 20]. 2. IP Addressing & Subnetting What are the private IP address ranges? Class A: 10.0.0.0 to 10.255.255.255 [1, 23]. Class B: 172.16.0.0 to 172.31.255.255 [1, 23]. Class C: 192.168.0.0 to 192.168.255.255 [1, 23]. Define Subnetting. The process of dividing a large parent network into smaller, more manageable sub-networks (subnets) to improve performance and security [11, 17, 20]. What is the difference between Static and Dynamic IP addressing? Static IP addresses are assigned manually and do not change, whereas Dynamic IP addresses are assigned automatically by a DHCP server and may change over time [1, 20, 23]. 3. Routing & Protocols What is Route Poisoning? A method used to prevent routing loops by advertising a failed route with an unreachable metric (e.g., a hop count of 16 in RIP) [1, 11, 20]. Compare RIP and IGRP/EIGRP. RIP: Uses hop count as its metric (max 15 hops) and is suitable for small networks [1, 17, 20]. IGRP/EIGRP: Cisco-proprietary protocols that use a composite metric including bandwidth, delay, reliability, and load [1, 17, 23]. What is OSPF? Open Shortest Path First is a link-state routing protocol that uses the Dijkstra algorithm to find the best path. It is highly scalable and has no hop count limit [1, 14, 20]. 4. Cisco Router Operations What are the different types of memory in a Cisco router? ROM: Stores the bootstrap program for starting the router [1, 20, 23]. Flash: Stores the Cisco IOS image [1, 11, 20]. NVRAM: Stores the startup configuration file [1, 11, 20]. RAM: Stores the running configuration and routing tables; its contents are lost when powered down [1, 11, 20]. Differentiate between User Mode and Privileged Mode. User Mode ( > It routes data packets between them using IP addresses