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Cisco Network Engineer Interview Questions and Answers

Updated 21 Jan 2025

Q1. What are he layers of the OSI model?

Ans.

The OSI model has 7 layers that define how data is transmitted over a network.

  • Layer 1: Physical - deals with the physical connection of devices

  • Layer 2: Data Link - responsible for error-free transfer of data between devices

  • Layer 3: Network - handles routing of data between different networks

  • Layer 4: Transport - ensures reliable delivery of data between applications

  • Layer 5: Session - establishes and manages connections between applications

  • Layer 6: Presentation - translates dat...read more

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Q2. What are you understand by networks.

Ans.

Networks are a collection of interconnected devices that communicate with each other to share resources and information.

  • Networks can be wired or wireless

  • They can be local (LAN) or wide area (WAN)

  • They use protocols such as TCP/IP to facilitate communication

  • Examples include the internet, corporate networks, and home networks

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Q3. There are seven layers in OSI model

Ans.

Yes, there are seven layers in the OSI model.

  • The seven layers are: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

  • Each layer has a specific function and communicates with the layers above and below it.

  • The OSI model is used to standardize communication between different computer systems.

  • Examples of protocols that operate at each layer include Ethernet at the Data Link layer and HTTP at the Application layer.

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Q4. What is a dangling pointer

Ans.

A dangling pointer is a pointer that points to a memory location that has been deallocated or freed.

  • Dangling pointers can lead to crashes or unpredictable behavior in a program.

  • They can occur when a pointer is not updated after the memory it points to is freed.

  • Example: accessing a dangling pointer after freeing the memory it points to can result in a segmentation fault.

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Q5. What is router &switch

Ans.

A router is a networking device that forwards data packets between computer networks, while a switch is a networking device that connects devices within a network.

  • Router operates at the network layer of the OSI model

  • Switch operates at the data link layer of the OSI model

  • Router connects multiple networks together

  • Switch connects devices within the same network

  • Router uses IP addresses to route traffic

  • Switch uses MAC addresses to forward data within a network

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Q6. What is MAC address

Ans.

MAC address is a unique identifier assigned to network interfaces for communications on a network.

  • MAC address stands for Media Access Control address

  • It is a 12-digit hexadecimal number (e.g. 00:1A:2B:3C:4D:5E)

  • Used to identify devices on a network at the data link layer of the OSI model

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Q7. What is DHCP

Ans.

DHCP stands for Dynamic Host Configuration Protocol, used to automatically assign IP addresses to devices on a network.

  • Automatically assigns IP addresses to devices on a network

  • Helps in managing and organizing IP addresses efficiently

  • Reduces the need for manual configuration

  • Prevents IP address conflicts

  • Example: When a device connects to a network, DHCP assigns it an IP address from a pool of available addresses

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Q8. What are REST APIs

Ans.

REST APIs are a set of rules and conventions for building and interacting with web services using HTTP methods.

  • REST stands for Representational State Transfer

  • Uses standard HTTP methods like GET, POST, PUT, DELETE

  • Data is transferred in JSON or XML format

  • Stateless communication between client and server

  • Example: Twitter API allows developers to access and interact with Twitter data

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Q9. How is routing done

Ans.

Routing is the process of selecting the best path for network traffic to reach its destination.

  • Routing involves determining the optimal path for data packets to travel from the source to the destination.

  • Routers use routing tables to make decisions on how to forward packets based on destination IP addresses.

  • Routing protocols like OSPF, BGP, and EIGRP are used to exchange routing information between routers.

  • Static routing involves manually configuring routes, while dynamic rout...read more

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Interview Process at Cisco Network Engineer

based on 7 interviews
1 Interview rounds
Technical Round
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