Kyndryl Network Engineer Interview Questions and Answers

Q1. Tell about the SDWAN concept.
Ans. 
SDWAN is a software-defined approach to managing and optimizing WAN connections.
• SDWAN uses software to control and manage network traffic across multiple WAN connections.

• It can dynamically route traffic based on network conditions and application requirements.

• SDWAN can improve network performance, reduce costs, and simplify network management.

• Examples of SDWAN vendors include Cisco, VMware, and Silver Peak.
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Q2. Difference between OSPF & EIGRP
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Q3. What is the cost of the default route?
Ans. 
The cost of default route varies depending on the network infrastructure and service provider.
• The cost of default route is usually included in the overall cost of the internet service provided by the ISP.

• The cost may also depend on the type of connection, such as fiber optic or cable.

• In some cases, the cost may be higher for businesses that require more bandwidth and faster speeds.

• The cost may also vary depending on th...read more
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Q4. How OSPF neighbourship occuures?
Ans. 
OSPF neighbourship occurs when two OSPF routers establish a relationship to exchange routing information.
• OSPF routers send hello packets to discover neighbours

• If the hello packets are compatible, the routers become neighbours

• The routers exchange database descriptors to synchronize their link-state databases

• If the databases are the same, the routers become fully adjacent

• Neighbourship can be affected by network topology ...read more
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Q5. What is AS path prepend?
Ans. 
AS path prepend is a technique used in BGP to influence the path selection of traffic.
• AS path prepend involves adding the same AS number multiple times to the AS path attribute of a BGP route advertisement.

• This makes the path appear longer and less desirable, causing traffic to prefer other paths.

• AS path prepend can be used to influence inbound or outbound traffic.

• Inbound traffic can be influenced by adding the local A...read more
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Q6. What is the difference between overlay and underlay?
Ans. 
Overlay is a network virtualization technique that adds a layer of abstraction over the physical network, while underlay refers to the physical network infrastructure.
• Overlay is used to create virtual networks on top of the physical network infrastructure.

• Underlay refers to the physical network infrastructure that provides connectivity between devices.

• Overlay networks are used to provide network virtualization, multi-t...read more
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Q7. What is VRF and how it works?
Ans. 
VRF stands for Virtual Routing and Forwarding. It is a technology that allows multiple instances of a routing table to coexist on the same router.
• VRF provides logical separation of routing tables, allowing multiple routing domains to exist on a single physical router.

• Each VRF has its own routing table and forwarding table, which allows for overlapping IP addresses to be used without conflict.

• VRFs are commonly used in M...read more
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Q8. What is BGP damping?
Ans. 
BGP damping is a technique used to reduce the impact of unstable routes on the internet.
• BGP damping helps to prevent the propagation of unstable routes by temporarily suppressing them.

• It is used to reduce the impact of route flapping, which occurs when a route repeatedly alternates between available and unavailable states.

• BGP damping assigns a penalty value to unstable routes, and if the penalty exceeds a certain thres...read more
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Q1. Discussed about previous experience
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Q2. Discussed about educational background
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Q3. Discussed about salary negotiation.
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Aptitude questions. Not much considered for final selection.

Q1. 1) Have through understanding of your skills Mentioned in Resume.
Ans. You should know as your resume speaks what you know.
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Q2. Networking Basics like AD values, Classes of IP address, Calculating number of hosts, Static Routing. Etc and about working in your previous company if you are working professional.
Ans. Refer CCNA syllabus
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Q1. Advanced technical concepts like Dynamite Routing Protocols, OSPF , OSPF stages, DR BDR Election, OSPF LSA types, BGP, BGP Attributes, BGP Dual Homed Dual Router scenario for incoming and outgoing traffic....read more
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Q1. Salary negotiation, one to one questions, happened over call for me.
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Q1. What is VRRP ?
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Q2. Why do we create VLAN?
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Q3. How do we configure FAILOVER via static Route?
Ans. 
Configuring FAILOVER via static Route involves setting up multiple routes with different priorities.
• Create multiple static routes with different next-hop IP addresses

• Assign different administrative distances to each static route

• Configure IP SLA to track the primary route and switch to the secondary route if the primary route fails
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Q1. OSI Model, DNS recods, Zones, DHCP & DNS
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