Quess Network Security Interview Questions, Process, and Tips

Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on Networking.

Q1. What is BGP?
Ans. 
BGP stands for Border Gateway Protocol, a routing protocol used to exchange routing information between different networks on the internet.
• BGP is used to make routing decisions based on network policies, path preferences, and network reachability.

• It is commonly used by Internet Service Providers (ISPs) to connect their networks and exchange routing information.

• BGP operates on the application layer of the OSI model and ...read more
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Q2. What is the Data Link Layer?
Ans. 
The Data Link Layer is the second layer of the OSI model responsible for node-to-node communication within a network.
• Responsible for framing, addressing, and error detection

• Controls access to the physical medium

• Examples include Ethernet, Wi-Fi, and PPP protocols
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Q3. How many types of networking layers are there?
Ans. 
There are 7 types of networking layers in the OSI model.
• Physical layer - deals with physical connections and signals

• Data link layer - responsible for node-to-node communication

• Network layer - handles routing and forwarding

• Transport layer - ensures end-to-end communication

• Session layer - manages sessions between applications

• Presentation layer - translates data for the application layer

• Application layer - interacts with
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Q4. What is OSPF?
Ans. 
OSPF (Open Shortest Path First) is a routing protocol used to determine the best path for data packets in a network.
• OSPF is a link-state routing protocol

• It uses Dijkstra's algorithm to calculate the shortest path

• OSPF routers exchange link-state advertisements (LSAs) to build a topology database

• It supports multiple areas for scalability

• OSPF is commonly used in large enterprise networks and ISPs
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Q5. What is a router?
Ans. 
A router is a networking device that forwards data packets between computer networks.
• Routes data packets between different networks

• Acts as a gateway for devices to connect to the internet

• Uses IP addresses to determine where to send data packets

• Can be wired or wireless

• Examples: Cisco, Netgear, TP-Link routers
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Q6. What is a switch in computer networking?
Ans. 
A switch in computer networking is a device that connects devices within a local area network (LAN) and forwards data packets between them.
• Switch operates at the data link layer of the OSI model

• It uses MAC addresses to forward data to the correct destination

• Switches increase network performance by reducing collisions and segmenting traffic

• Examples of switches include Cisco Catalyst series, Netgear ProSAFE switches
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