HCLTech
10+ CorroHealth infotech Interview Questions and Answers
Q1. Explain yourself, what is natting, list types of lsa, explain ipsec tunnel
NATting is a process of modifying network address information in packet headers, LSA types include Type 1, Type 2, Type 3, Type 4, Type 5, and Type 7, IPsec tunnel is a secure communication channel established between two devices.
NATting stands for Network Address Translation, used to modify network address information in packet headers
Types of LSA (Link State Advertisement) include Type 1 (Router LSA), Type 2 (Network LSA), Type 3 (Summary LSA), Type 4 (ASBR Summary LSA), Ty...read more
Q2. What is network,DHCP, SWITCH, ROUTER AND IP.
Network is a collection of interconnected devices that communicate with each other using protocols.
DHCP (Dynamic Host Configuration Protocol) is a network protocol that automatically assigns IP addresses to devices on a network.
A switch is a networking device that connects devices on a local area network (LAN) and forwards data packets between them.
A router is a networking device that connects multiple networks and forwards data packets between them.
IP (Internet Protocol) is ...read more
Q3. How to check interface in router?
To check interface in a router, you can use the show interface command in the router's CLI.
Access the router's CLI interface
Use the 'show interface' command to display information about all interfaces on the router
Check the status, IP address, and other relevant details of the specific interface
Q4. What is vtp? And what is ethernet?
VTP stands for VLAN Trunking Protocol, used to manage VLAN configurations in a network. Ethernet is a widely used networking technology for local area networks.
VTP is used to synchronize VLAN information across a network of switches.
It helps in reducing the administrative overhead of managing VLANs individually on each switch.
Ethernet is a standard for connecting computers and other devices in a local area network (LAN).
It uses a protocol to control the way data is transmitte...read more
Q5. What is ospf and how it works?
OSPF (Open Shortest Path First) is a routing protocol used to find the best path for data packets in a network.
OSPF is a link-state routing protocol that uses Dijkstra's algorithm to calculate the shortest path.
It operates within an autonomous system (AS) and exchanges routing information using link-state advertisements (LSAs).
OSPF routers maintain a link-state database to build a topology map of the network.
The shortest path tree is calculated based on the cost of links, wit...read more
Q6. What is VPN and what's VLAN
VPN stands for Virtual Private Network, used to securely connect remote users or networks. VLAN stands for Virtual Local Area Network, used to segment network traffic.
VPN allows users to securely access a private network over a public network like the internet
VLAN divides a physical network into multiple virtual networks for better traffic management
VPN encrypts data to ensure privacy and security during transmission
VLAN helps in improving network performance by reducing broa...read more
Q7. What is OSPF protocol
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 map of the network
It supports VLSM (Variable Length Subnet Masking) and CIDR (Classless Inter-Domain Routing)
OSPF is widely used in large enterprise networks and ISPs
Q8. What is MED ?
MED stands for Multi-Exit Discriminator, a BGP attribute used to influence the path selection in a network.
MED is a 32-bit value included in BGP updates to indicate the preferred path for outbound traffic.
Lower MED values are preferred by BGP routers when selecting a route.
MED is typically used to influence outbound traffic flow from one AS to another.
MED is not mandatory and is only considered when comparing routes from the same neighboring AS.
Example: Router A advertises a ...read more
Q9. What is the VRF?
VRF stands for Virtual Routing and Forwarding. It is a technology that allows multiple instances of a routing table to coexist within the same router.
VRF enables multiple virtual routers to exist within a single physical router
Each VRF instance maintains its own routing table and forwarding information
VRF is commonly used in MPLS networks to segregate customer traffic
VRF provides network segmentation and isolation for different customers or applications
Q10. What is the HSRP?
HSRP stands for Hot Standby Router Protocol, a Cisco proprietary redundancy protocol used to provide high availability for network services.
HSRP is used to provide redundancy for routers in a network by allowing multiple routers to work together in a group.
One router is elected as the active router, handling traffic for the virtual IP address, while the other routers in the group act as standby routers.
If the active router fails, one of the standby routers takes over as the n...read more
Q11. What BGP OSPF VPN
BGP, OSPF, and VPN are all protocols used in networking to facilitate communication and secure data transmission.
BGP (Border Gateway Protocol) is used to exchange routing information between different autonomous systems on the internet.
OSPF (Open Shortest Path First) is an interior gateway protocol used to find the best path for routing within a single autonomous system.
VPN (Virtual Private Network) is a technology that creates a secure and encrypted connection over a less se...read more
Q12. Ha configuration on firewall
Configuration on firewall involves setting up rules and policies to control network traffic.
Configure access control lists (ACLs) to allow or deny traffic based on source, destination, and port
Set up virtual private networks (VPNs) for secure remote access
Implement intrusion prevention systems (IPS) to detect and block malicious traffic
Regularly update firewall firmware and review logs for security incidents
Q13. What is natting
NATting stands for Network Address Translation, a process used to modify network address information in packet headers while in transit.
NATting allows multiple devices on a local network to share a single public IP address
It can be used to hide the internal network structure from the outside world for security purposes
Types of NAT include Static NAT, Dynamic NAT, and Port Address Translation (PAT)
Q14. What is subnetting
Subnetting is the process of dividing a network into smaller sub-networks to improve performance and security.
Subnetting helps in efficient utilization of IP addresses
It allows for better network management and organization
Subnet masks are used to determine the network and host portions of an IP address
Example: dividing a network with IP range 192.168.1.0/24 into smaller subnets like 192.168.1.0/26 and 192.168.1.64/26
Interview Process at CorroHealth infotech
Top Network Engineer Interview Questions from Similar Companies
Reviews
Interviews
Salaries
Users/Month