10+ Velocis Systems Network Engineer Interview Questions and Answers

The question covers various networking concepts and protocols such as STP, EIGRP, OSPF, TCP header, and IOS commands.

• STP (Spanning Tree Protocol) is used to prevent loops in a network.

• EIGRP (Enhanced Interior Gateway Routing Protocol) dual algorithm is a routing protocol used in Cisco networks.

• Static Routing is a type of routing where the network administrator manually configures the routes.

• Administrative Value is a numerical value assigned to different routing protocols to d...read more

Port security is a feature that restricts access to a network switch port based on the MAC address of the device connected to it.

• Port security limits the number of MAC addresses allowed on a port.

• It can be configured to shut down the port if unauthorized devices are detected.

• Port security can be managed through configuration on the network switch.

• Examples of port security management include setting maximum number of allowed MAC addresses and configuring violation actions.

Network strength can be checked using various tools and techniques.

• Use network monitoring tools like Ping, Traceroute, and SNMP to check network performance.

• Check signal strength and quality for wireless networks using tools like NetSpot or inSSIDer.

• Analyze network traffic and bandwidth usage to identify any bottlenecks or issues.

• Perform speed tests using websites like Speedtest.net to measure download and upload speeds.

• Check for any network errors or packet loss using tools ...read more

Ether Channel is a technology used in networking to combine multiple physical links into a single logical link for increased bandwidth and redundancy.

• Ether Channel is also known as Link Aggregation or Port Channel.

• It allows multiple physical links to be bundled together to form a single logical link.

• Ether Channel provides increased bandwidth and fault tolerance.

• It is commonly used in switch-to-switch or switch-to-server connections.

• Ether Channel can be configured using protoc...read more

Network issues can be managed by identifying the problem, troubleshooting, implementing solutions, and monitoring for future issues.

• Identify the root cause of the network issue

• Troubleshoot the problem using network diagnostic tools

• Implement solutions such as reconfiguring network settings or replacing faulty hardware

• Monitor the network for any recurring issues

Communication with ISP involves establishing a connection and troubleshooting network issues.

• Contact ISP's technical support for assistance

• Provide relevant information such as account details and network configurations

• Use tools like ping and traceroute to diagnose connectivity problems

• Escalate issues if necessary to ensure timely resolution

HSRP stands for Hot Standby Router Protocol. It is a Cisco proprietary redundancy protocol used to provide high availability for routing.

• HSRP allows for two or more routers to work together in a group, sharing a virtual IP address and providing redundancy in case one router fails.

• One router is elected as the active router, handling traffic for the virtual IP address, while the other routers in the group remain in standby mode.

• If the active router fails, one of the standby rou...read more

STP stands for Spanning Tree Protocol, used in network environments to prevent loops and ensure redundancy.

• STP is a network protocol used to prevent loops in Ethernet networks.

• It selects a single path for traffic within a network, blocking redundant paths to prevent loops.

• STP operates by exchanging messages between switches to detect loops and elect a root bridge.

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

RSTP stands for Rapid Spanning Tree Protocol, a network protocol used to prevent loops in Ethernet networks.

• RSTP is an improvement over the original Spanning Tree Protocol (STP) and provides faster convergence in the network.

• It uses a variety of port roles such as root port, designated port, and alternate port to ensure loop-free topology.

• RSTP introduces new features like port roles, port states, and BPDU (Bridge Protocol Data Unit) formats.

• Example: In RSTP, the root bridge i...read more

BGP is a routing protocol used to exchange routing information between different autonomous systems, while MPLS is a technology used to direct data packets through a network using labels.

• BGP (Border Gateway Protocol) is a path vector protocol used to exchange routing information between different autonomous systems.

• MPLS (Multiprotocol Label Switching) is a technology used to direct data packets through a network using labels instead of IP addresses.

• BGP is used for inter-domai...read more

LAN stands for Local Area Network, used for connecting devices within a limited area. WAN stands for Wide Area Network, used for connecting devices over a large geographical area.

• LAN is typically used in homes, schools, and small businesses.

• WAN is used to connect multiple LANs over a larger area, such as connecting offices in different cities.

• LAN has higher data transfer speeds compared to WAN.

• LAN is usually owned, controlled, and managed by a single organization, while WAN i...read more

HTTP is unsecured protocol while HTTPS is secured protocol using SSL/TLS encryption.

• HTTP stands for Hypertext Transfer Protocol, while HTTPS stands for Hypertext Transfer Protocol Secure.

• HTTP operates on port 80, while HTTPS operates on port 443.

• HTTP does not encrypt data, making it vulnerable to attacks like man-in-the-middle, while HTTPS encrypts data using SSL/TLS.

• HTTPS is indicated by a padlock icon in the browser's address bar, ensuring secure communication between the c...read more

OSI model has 7 layers. Each layer has a specific function to perform.

• Layer 1 - Physical layer: Deals with physical connections and transmission of raw data

• Layer 2 - Data link layer: Provides error-free transfer of data between nodes on the same network

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

• Layer 4 - Transport layer: Ensures reliable delivery of data between end systems

• Layer 5 - Session layer: Establishes, manages and terminates sessions be...read more

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

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

• Types of VPN include Site-to-Site VPN, Remote Access VPN, and Mobile VPN

• Site-to-Site VPN connects two or more networks together

• Remote Access VPN allows individual users to connect to a private network from a remote location

• Mobile VPN provides secure access to mobile devices while they a...read more

Steps for upgrading firewall include planning, testing, implementing, and monitoring.

• 1. Plan the upgrade by identifying the current firewall model and version.

• 2. Backup the firewall configuration to ensure data safety.

• 3. Test the upgrade in a lab environment to identify any potential issues.

• 4. Implement the upgrade during a maintenance window to minimize downtime.

• 5. Monitor the firewall post-upgrade for any performance or security issues.

• 6. Communicate with stakeholders about...read more

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers.

• The OSI model consists of seven layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and communicates with the corresponding layer on another device.

• For example, the Physical layer deals with the physical connection between devices, wh...read more