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Networking Real Time Interview Questions and Answers

HCL real time interview questions

10. How switch learn MAC address? Explain MAC learning in switches.
11. What are the advantages of PPP protocol?
An open-standard serial encapsulation
Allows multiple network-layer protocols to travel across
Allows optional link-layer authentication (CHAP or PAP)
One router interface only goes to one destination
12. How do two computers communicate with each other when they are connected through L2 or L3 switch?
13. What is looping and how switching loops are avoided at L2 level?
14. What is ACL?
15. Which application protocol can not be blocked by the Switch?
16. Maximum number of ports that can be added to LAG.
17. Create a LAG port between two switch.Add two switch port to that LAG.Port speed is 1Gbps.What will happen if 1.5 Gbps traafic will be sent from one end station to other via LAG port.
18. What is the behavior of the L2 Switch in case of receiving a multicast packet.
19. How a switch will behave for a mcast packet if Snooping is not enabled o
20. What is VLAN? And the need of VLAN?
21. VLAN tagging/un-tagging process –where and when it happens?
22. What is native VLAN? What is the use?
23. What are the fields of VLAN tag?
24. Port modes [trunk and access] have any influence on VLAN tagging and un-tagging?
25. Scenario: “In a switch two hosts are connected to port number 1 and 2 respectively; both the ports are configured with same VLAN id. When data is sent from one host to another, in switch VLAN tagging will happen or not? Why?”
26. Explain VLAN concepts.
27. Explain the Vlan tag information.
28. Response of switch when we send tagged packet on access port.
29. Response of switch when we send different vlan data from different port using same mac id.
30. What will happen if we send untagged packet to a tagged port
31. If a switch has been configured with two vlans, how many broadcast domains will be there?
32. Explain 802.1Q header?.
33. How many vlan we can configured in switch?
34. How will you find number of VLAN in switch?

35. Design a Testplan for vlan validation? Tip: Make sure you cover p1,p2,p3 testcases
36. CFI in 1q header ? what does 1 & 0 means?
37. What is Q-in-Q?
38. What happens to a frame with contents(da,sa,1q header info) getting changed?
39. Purpose of TPID in 1q header ?
40. Relation between spanning tree and vlan ?
41. Purpose of TTL. How it gets modified.
42. There are two switches connected via trunk port.One end station is connected to each switch via access port. All the ports are in same VLAN.All the ports have same speed 1Gbps.Start sending 1Gbps traffic from one end station to other. Determine percentage of traffic received by destination end station.

In: Networking Real Time Asked By: [3 Grey Star Level]

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