100+ Network Support Engineer Interview Questions and Answers

VTP is a protocol used to manage VLAN configurations across a network, while VLAN is a logical grouping of devices within a network.

• VTP (VLAN Trunking Protocol) is used to synchronize VLAN information across switches in a network.

• VLAN (Virtual Local Area Network) is a logical grouping of devices based on factors like department, function, or location.

• VTP helps in reducing the administrative overhead of manually configuring VLANs on each switch.

• VLANs help in segmenting network...read more

OSI Layers are a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers.

• Physical Layer - deals with physical connections and transmission of raw data

• Data Link Layer - responsible for node-to-node communication

• Network Layer - manages network connections and routing

• Transport Layer - ensures end-to-end communication

• Session Layer - establishes, maintains, and terminates connections

• Presentation Layer - translat...read more

A network is a collection of computers, servers, mainframes, network devices, and other devices connected to one another for sharing data and resources.

• Networks can be wired or wireless

• Networks can be local (LAN), wide area (WAN), or global (Internet)

• Networks use protocols like TCP/IP for communication

STP is Spanning Tree Protocol used to prevent loops in network. TCP/UDP are transport layer protocols used for data transmission.

• STP is used to prevent loops in a network by blocking redundant paths.

• It selects the shortest path to the root bridge and blocks other paths.

• TCP is a connection-oriented protocol that ensures reliable data transmission.

• UDP is a connectionless protocol that is faster but less reliable than TCP.

• TCP uses three-way handshake to establish a connection.

• UD...read more

Protocol is a set of rules that govern the communication between devices in a network.

• Protocol defines the format, timing, sequencing, and error checking of data transmission.

• Examples of protocols include TCP/IP, HTTP, FTP, and SMTP.

• Protocols ensure that devices can communicate effectively and understand each other's data.

Three-way handshake is a process used in TCP/IP networking to establish a connection between two devices.

• The client sends a SYN (synchronize) packet to the server.

• The server responds with a SYN-ACK (synchronize-acknowledge) packet.

• The client sends an ACK (acknowledge) packet to the server, and the connection is established.

• This process ensures that both devices are ready to communicate and establishes the parameters of the connection.

I have been using Cisco ACI for 2 years.

• I have experience in configuring and troubleshooting Cisco ACI fabric.

• I have worked with ACI policies, tenants, application profiles, and endpoint groups.

• I have also worked with ACI integration with other Cisco products like Nexus switches and UCS servers.

Basic requirements of CCNA include knowledge of networking fundamentals, routing and switching, and hands-on experience with Cisco devices.

• Understanding of networking fundamentals such as TCP/IP, subnetting, and OSI model

• Knowledge of routing and switching concepts including VLANs, STP, and routing protocols like OSPF and EIGRP

• Hands-on experience with Cisco routers and switches

• Ability to troubleshoot network issues and configure network devices

• CCNA certification is recommended...read more

Python language supports various data structures and algorithms concepts.

• Python has built-in data structures like lists, tuples, dictionaries, and sets.

• Common algorithms like sorting (e.g. merge sort, quick sort) and searching (e.g. binary search) can be implemented in Python.

• Python also supports advanced data structures like stacks, queues, heaps, and graphs.

• Popular libraries like NumPy and Pandas provide efficient data structures for numerical computations and data manipula...read more

DHCP stands for Dynamic Host Configuration Protocol. It is a network protocol that automatically assigns IP addresses to devices.

• DHCP is used to simplify network administration by automating the IP address assignment process.

• It allows devices to obtain IP addresses and other network configuration information from a DHCP server.

• DHCP leases IP addresses for a limited time period, after which the device must renew the lease or obtain a new IP address.

• DHCP can also be used to ass...read more

Routers, switches, and firewalls are networking devices used to manage and secure network traffic.

• Router: device that forwards data packets between computer networks. Example: Cisco routers

• Switch: device that connects devices within a network and forwards data to specific devices. Example: Netgear switches

• Firewall: security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. Example: Palo Alto Networks firewall

DHCP DORA process is the sequence of steps followed by a client to obtain an IP address from a DHCP server.

• DORA stands for Discover, Offer, Request, and Acknowledge.

• Discover: Client broadcasts a DHCP Discover message to find available DHCP servers.

• Offer: DHCP servers respond with DHCP Offer messages containing IP address lease information.

• Request: Client selects one DHCP Offer and sends a DHCP Request message to request the offered IP address.

• Acknowledge: DHCP server sends a ...read more

The TCP/IP model is a conceptual framework used to understand and describe how data is transmitted over a network.

• The TCP/IP model consists of four layers: Network Interface, Internet, Transport, and Application.

• Each layer has its own protocols and functions that contribute to the overall transmission of data.

• The Network Interface layer handles the physical connection between devices, such as Ethernet or Wi-Fi.

• The Internet layer is responsible for addressing and routing data ...read more

The OSI model is a conceptual framework that standardizes the functions of a communication system into seven different layers.

• The OSI model stands for Open Systems Interconnection model.

• It was developed by the International Organization for Standardization (ISO) in the 1980s.

• The model is divided into seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and protocols that enable communication between de...read more

A router is a networking device that forwards data packets between computer networks.

• Routes data packets between different networks

• Uses IP addresses to determine where to send data

• Helps in creating a network of interconnected devices

• Acts as a gateway for data traffic

• Examples: Cisco routers, TP-Link routers

A switch is a networking 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 improve network performance by reducing collisions and segmenting traffic

• Examples include Cisco Catalyst switches, Juniper EX switches

Amaze Pharmaceuticals is a leading company known for its innovative solutions and commitment to excellence in the pharmaceutical industry.

• Amaze Pharmaceuticals has a strong reputation for developing cutting-edge pharmaceutical products.

• The company values teamwork and collaboration, which are essential qualities for a Network Support Engineer.

• Amaze Pharmaceuticals offers opportunities for professional growth and development.

• The company's commitment to quality and patient safet...read more

Networking is the practice of connecting computers and other devices to share resources and information. IoT refers to the network of physical devices connected to the internet, allowing them to communicate and exchange data.

• Networking involves connecting devices to share resources and information

• IoT refers to physical devices connected to the internet

• IoT devices can communicate and exchange data

• Examples of IoT devices include smart thermostats, wearable fitness trackers, and...read more

IP classes are categories of IP addresses used to identify networks and hosts.

• There are five classes of IP addresses: A, B, C, D, and E.

• Classes A, B, and C are commonly used for host addresses, while classes D and E are reserved for special purposes.

• Each class has a different range of possible IP addresses.

• Class A addresses start with 1-126, Class B addresses start with 128-191, and Class C addresses start with 192-223.

• Classes D and E are used for multicast and experimental p...read more

Route poisoning is a technique used in computer networking to prevent routing loops.

• Route poisoning involves setting a metric value to infinity for a route that is no longer available.

• This informs other routers to remove that route from their routing tables.

• Route poisoning is commonly used in distance-vector routing protocols like RIP.

• Without route poisoning, routing loops can occur and cause network congestion and instability.

A Cisco switch is a networking device that connects devices within a local area network (LAN) by using packet switching to forward data to the appropriate destination.

• Cisco switches operate at Layer 2 (Data Link Layer) of the OSI model.

• They use MAC addresses to forward data within a network.

• Cisco switches can have multiple ports to connect various devices such as computers, printers, and servers.

• They can also support advanced features like VLANs, QoS, and security protocols.

• E...read more

An IP address is a unique numerical identifier assigned to each device connected to a computer network.

• IP stands for Internet Protocol

• It consists of four sets of numbers separated by dots

• It is used to identify and communicate with devices on a network

• IPv4 addresses are 32-bit and IPv6 addresses are 128-bit

• Example: 192.168.1.1

Fiber cable issue refers to problems or faults in the fiber optic cables used for network communication.

• Fiber cable damage from bending or crushing

• Fiber cable connection issues

• Fiber cable contamination affecting signal quality

To configure a switch, access its command line interface and use commands to set up VLANs, assign IP addresses, and configure ports.

• Connect to the switch using a console cable or remotely via SSH or Telnet

• Access the command line interface using a username and password

• Configure VLANs to segment network traffic

• Assign IP addresses to the switch and its interfaces

• Configure ports for specific functions such as access or trunk

• Save the configuration to non-volatile memory

GPON, EPON, OLT, and ONT are all components of a fiber optic network used in telecommunications.

• GPON stands for Gigabit Passive Optical Network, a type of fiber optic network technology.

• EPON stands for Ethernet Passive Optical Network, another type of fiber optic network technology.

• OLT stands for Optical Line Terminal, a device that serves as the endpoint of a passive optical network.

• ONT stands for Optical Network Terminal, a device that serves as the customer endpoint in a p...read more

A network is a group of interconnected devices that communicate with each other to share resources and information.

• A network can be wired or wireless.

• Devices on a network can include computers, printers, routers, and servers.

• Networks can be local (LAN) or wide area (WAN).

• The internet is a global network of networks.

• Networks use protocols such as TCP/IP to enable communication between devices.

Family is a source of love, support, and belonging.

• Family provides emotional support during tough times

• Family members share special moments and create lasting memories together

• Family can be a source of guidance and advice in decision-making

• Family dynamics can vary greatly from one household to another

Network topology refers to the layout of a computer network and how different devices are connected.

• Network topology defines how devices are interconnected in a network

• Common topologies include bus, ring, star, mesh, and hybrid

• Each topology has its own advantages and disadvantages

• Examples: Bus topology - all devices connected to a single cable, Star topology - all devices connected to a central hub

Network topology refers to the layout of a network and how different devices are connected.

• Network topology can be physical or logical.

• Common physical topologies include bus, star, ring, and mesh.

• Common logical topologies include peer-to-peer and client-server.

• Each topology has its own advantages and disadvantages in terms of cost, scalability, and performance.

The server name is not specified. Can you please provide more context?

• The question needs more information to provide a specific answer.

• The server name could refer to a specific server in a network or a domain name.

• Without additional context, it is impossible to provide a meaningful answer.

DORA (Discover Offer Request Acknowledge) is a process used by DHCP clients to obtain IP addresses from DHCP servers.

• DHCP client sends a Discover message to locate available DHCP servers

• DHCP server responds with an Offer message containing an available IP address

• DHCP client sends a Request message to request the offered IP address

• DHCP server responds with an Acknowledge message to confirm the IP address assignment

• The DHCP client then configures its network interface with the ...read more

I have 5 years of experience as a Network Support Engineer.

• Worked with a team to troubleshoot and resolve network issues

• Configured and maintained network devices such as routers and switches

• Provided technical support to end-users

• Implemented network security measures

• Performed network monitoring and performance analysis

The OSI model is a conceptual model that characterizes and standardizes the communication functions of a telecommunication or computing system.

• OSI stands for Open Systems Interconnection.

• It has 7 layers, each with a specific function.

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

• Each layer communicates with the layer above and below it.

• The model helps ensure interoperability between different systems and devices.

• Example: HTTP ...read more

VPN stands for Virtual Private Network. It is a secure and encrypted connection between two devices over the internet.

• VPN allows remote access to a private network over the internet

• It provides security and privacy by encrypting the data transmitted over the network

• VPN can be used to bypass geographical restrictions and access content not available in your region

• Examples of VPN include OpenVPN, Cisco AnyConnect, and NordVPN

VPN stands for Virtual Private Network, which allows users to securely access a private network over a public network.

• VPN creates a secure and encrypted connection between the user's device and the private network.

• It helps in protecting sensitive data from unauthorized access or interception.

• VPN can be used to access region-restricted websites or services.

• Common VPN protocols include OpenVPN, L2TP/IPsec, and PPTP.

Radio in wireless refers to the transmission of data using radio waves, allowing devices to communicate wirelessly.

• Radio waves are electromagnetic waves that have a frequency suitable for wireless communication.

• They are used in technologies like Wi-Fi, Bluetooth, and cellular networks.

• Radio waves can carry data over long distances without the need for physical cables.

• Devices like smartphones, laptops, and routers use radio waves to connect to the internet.

• Radio waves can be a...read more

AAA stands for Authentication, Authorization, and Accounting.

• AAA is a security framework used to control access to network resources.

• Authentication verifies the identity of a user or device.

• Authorization determines what resources a user or device can access.

• Accounting tracks the usage of network resources for billing or auditing purposes.

• AAA protocols include RADIUS and TACACS+.

ICMP stands for Internet Control Message Protocol. It is a network protocol used to send error messages and operational information about network conditions.

• ICMP is used by network devices to communicate error messages and status updates.

• It is commonly used by ping and traceroute utilities to test network connectivity.

• ICMP messages are encapsulated within IP packets.

• ICMP can be used for diagnostic and troubleshooting purposes.

• ICMP messages include echo request and reply messa...read more

DNS stands for Domain Name System, which translates domain names to IP addresses.

• DNS is like a phone book for the internet, translating human-readable domain names (like google.com) to IP addresses (like 172.217.3.206).

• It helps users access websites and other online services by resolving domain names to their corresponding IP addresses.

• DNS also helps in load balancing, failover, and security by directing traffic to the appropriate servers.

• Common DNS record types include A rec...read more

A network is a collection of computers, servers, mainframes, network devices, and other devices connected to each other to share resources and information.

• A network allows devices to communicate with each other, share resources, and access the internet.

• Networks can be wired or wireless, with examples including LANs, WANs, and the internet.

• Networks can be private (intranet) or public (internet), with security measures in place to protect data.

• Networks use protocols like TCP/IP...read more

A Cisco switch is a networking device that connects devices within a local area network (LAN) and forwards data packets between them.

• Cisco switches operate at the data link layer (Layer 2) of the OSI model.

• They use MAC addresses to forward data within a network.

• Cisco switches can have multiple ports to connect various devices such as computers, printers, and servers.

• They provide features like VLANs, QoS, and security settings to optimize network performance and security.

• Examp...read more

I have supported various networking systems including Cisco, Juniper, and Palo Alto.

• Cisco networking systems

• Juniper networking systems

• Palo Alto networking systems

Networking is the practice of connecting computers and other devices to share resources and communicate with each other.

• Networking involves the use of hardware such as routers, switches, and cables to create a network.

• It also involves the use of protocols such as TCP/IP to facilitate communication between devices.

• Networking allows devices to share resources such as files, printers, and internet connections.

• Examples of networking technologies include Ethernet, Wi-Fi, and VPNs.

There are 7 OSI layers in the OSI model.

• There are 7 layers in the OSI model: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and protocols associated with it.

• The OSI model helps in understanding how different networking components communicate with each other.

There are many types of networks, including LAN, WAN, MAN, WLAN, and VPN.

• LAN (Local Area Network) - connects devices within a limited area like a home or office

• WAN (Wide Area Network) - connects devices over a large geographical area

• MAN (Metropolitan Area Network) - covers a larger area than a LAN but smaller than a WAN

• WLAN (Wireless Local Area Network) - uses wireless technology to connect devices in a limited area

• VPN (Virtual Private Network) - creates a secure connection o...read more

STP stands for Spanning Tree Protocol, a network protocol that ensures a loop-free topology in Ethernet networks.

• STP prevents loops in Ethernet networks by blocking redundant paths

• It elects a root bridge to serve as the central point in the network

• STP calculates the shortest path to the root bridge for each switch

• Common variants include RSTP (Rapid Spanning Tree Protocol) and MSTP (Multiple Spanning Tree Protocol)

A VLAN (Virtual Local Area Network) is a network of devices that behave as if they are connected to the same physical network, even though they may be located on different segments.

• VLANs divide a single physical network into multiple virtual networks.

• They help improve network security by isolating traffic between different VLANs.

• VLANs can be used to logically group devices based on department, function, or security requirements.

• Each VLAN has its own broadcast domain, reducing...read more