Top 250 Networking Interview Questions and Answers

The seven layers of networking refer to the OSI model which defines how data is transmitted over a network.

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

• Each layer has a specific function and co...read more

The first steps to troubleshoot a computer wifi issue

• Check if the wifi is enabled on the computer

• Restart the computer and the wifi router

• Ensure the computer is within range of the wifi signal

• Check if other devices can connect to the wifi network

• Updat...read more

The layers that call to the heart of OSI are the Transport layer and the Application layer.

• The Transport layer is responsible for the end-to-end delivery of data and ensures reliable communication between hosts.

• The Application layer provides services...read more

iLO IP stands for Integrated Lights-Out IP. It is a management processor embedded in HP ProLiant servers for remote server management.

• iLO IP is used to remotely manage and monitor HP ProLiant servers.

• It provides features like power control, remote co...read more

DNS stands for Domain Name System. It is a system that translates domain names into IP addresses.

• DNS is like a phonebook for the internet

• It helps to locate websites by translating domain names into IP addresses

• DNS servers store information about doma...read more

BGP (Border Gateway Protocol) is a routing protocol used in internet networks. It provides scalability, redundancy, and policy control.

• BGP is used to exchange routing information between different autonomous systems (AS)

• It allows for efficient routin...read more

The VPN port used for UDP is typically 500.

• The VPN port used for UDP is usually port 500.

• UDP is a protocol that allows for faster transmission of data but does not guarantee delivery or order of packets.

• Port 500 is commonly used for IPsec VPNs, which...read more

LAN stands for Local Area Network, which connects two or more devices in a limited area.

• LAN is a type of network that connects devices within a limited area such as a room, floor, or building.

• It allows devices to communicate with each other and share...read more

The latest router and switch used in the market are Cisco Catalyst 9000 Series switches and Cisco ASR 9000 Series routers.

• Cisco Catalyst 9000 Series switches are known for their advanced security features and programmability.

• They offer high performan...read more

TCP (Transmission Control Protocol) is a reliable, connection-oriented protocol that provides error checking and flow control.

• TCP is responsible for breaking data into packets and reassembling them at the destination

• TCP header contains source and des...read more

OSPF has three layers: backbone, area, and interface.

• Backbone layer connects all areas and is responsible for routing between them.

• Area layer groups networks together and reduces the amount of routing information exchanged.

• Interface layer connects ro...read more

Protocols that work with Application layers include HTTP, FTP, SMTP, DNS, and SNMP.

• HTTP (Hypertext Transfer Protocol) is used for web browsing and communication between web servers and clients.

• FTP (File Transfer Protocol) is used for transferring fil...read more

F5 load balances traffic by distributing it across multiple servers to optimize performance and ensure high availability.

• F5 uses a variety of load balancing algorithms such as round robin, least connections, and weighted round robin.

• It distributes in...read more

HTTP is stateless because it does not retain information about previous requests.

• HTTP treats each request as an independent transaction without any knowledge of previous requests.

• This design simplifies implementation and improves scalability.

• State in...read more

VLANs are needed to logically segment a network, improve security, optimize network performance, and simplify network management.

• VLANs help in isolating network traffic, reducing broadcast domains, and enhancing network security.

• They allow for better...read more

Two systems in different VLANs can communicate through a router or layer 3 switch.

• A router or layer 3 switch is required to route traffic between VLANs

• Each system must have a unique IP address within their respective VLANs

• The router or layer 3 switch...read more

Routing is the process of navigating between different components or pages in an Angular application.

• Routing is used to create single-page applications (SPAs) where the content is dynamically loaded without refreshing the entire page.

• In Angular, rout...read more

The protocol with the lowest AD value is OSPF (Open Shortest Path First).

• AD (Administrative Distance) is a value used by routers to determine the best path for forwarding packets.

• Lower AD value indicates a more preferred route.

• OSPF has an AD value of...read more

The basic steps of network troubleshooting involve identifying the problem, gathering information, isolating the issue, testing solutions, and implementing fixes.

• Identify the problem by gathering information from the user or monitoring tools

• Isolate t...read more

LAN is a wired network that connects devices within a limited area, while WIFI is a wireless network that allows devices to connect without cables.

• LAN uses Ethernet cables to connect devices, while WIFI uses radio waves.

• LAN is faster and more secure ...read more

HTTPS stands for Hypertext Transfer Protocol Secure. It is a secure version of HTTP that encrypts data sent between a website and a user's browser.

• HTTPS uses SSL/TLS encryption to protect data

• It ensures that the website being accessed is authentic

• It ...read more

IP address is a unique numerical identifier assigned to devices connected to a network.

• IP stands for Internet Protocol

• It consists of a series of numbers separated by dots

• It is used to identify devices on a network and facilitate communication

• There ar...read more

A /29 subnet has 6 usable host addresses.

• A /29 subnet has a subnet mask of 255.255.255.248.

• The subnet mask leaves 3 bits for host addresses.

• 2^3 = 8, but 2 addresses are reserved for network and broadcast.

• Therefore, a /29 subnet has 6 usable host addr...read more

TCP/IP stands for Transmission Control Protocol/Internet Protocol. It is a set of protocols that allows computers to communicate over the internet.

• TCP/IP is a suite of communication protocols used for transmitting data over networks.

• It provides relia...read more

UDP is used in scenarios where speed is more important than reliability, such as online gaming and video streaming.

• UDP is a connectionless protocol that does not guarantee delivery of packets

• It is faster than TCP because it does not have to establish...read more

A domain is a group of computers and devices on a network that share a common set of rules and procedures.

• Domains are used to manage and organize network resources.

• A domain is typically controlled by a domain controller.

• Users and computers within a d...read more

Yes, I have experience in MPLS/IP.

• I have worked with MPLS VPNs to provide secure connectivity between multiple sites.

• I have configured MPLS traffic engineering to optimize network performance.

• I have experience with MPLS QoS to prioritize traffic and ...read more