Amazon 1. Differences between TCP and UDP 2. What do you know about Wireshark 3. What are the different troubleshooting tools 4. TCP 3way handshake 5. Handshake while closing TCP session 6. If you want to write an application which protocol will you prefer? TCP or UDP 7. Experience with Linux and Windows 8. Difference between Ubuntu and Fedora 9. What is IPSec and how does it work 10. What do you know about VPN tunnels 11. Tell me different DNS records 12. How do you troubleshoot if website is slow 13. What are the steps for DNS resolution 14. What happens between user entering amazon.com and opening webpage 15. Difference between RIP and RIP2 16. Which routing protocol do you prefer and why? 17. How OSPF choses best bath? 18. What the different OSPF timers 19. Difference between OSPF and BGP 20. BGP message types 21. What is NSSSA in BGP 22. How does MPLS work 23. Difference between MPLS and BGP 24. How do u configure MPLS 25. Tell me one important difference between IGRP and EIGRP 26. How BGP neighbors are formed? 27. What are the different fields in VLAN tag 28. What do u know about native VLAN

Electronic Arts 1. Explain about Educational background 2. Explain networking experience 3. Why did you choose networking 4. What made you to apply for EA 5. Why do you want to do this job 6. Explain about projects you did 7. Where do you see yourself in next 3-5 years? 8. What are you expecting from this role? 9. Do u know any network troubleshooting tools or network analyzers. 10. Explain background process after you enter URL in browser 11. Two PCs are connected to each other but they cannot communicate. What can be the reasons? 12. What are the flags in TCP header 13. Tell me something about L4-L7 load balancers. 14. Do u know anything about VIP and Pool? Can u explain? 15. How is OSPF configured? 16. After u configure OSPF how do u check whether if U have configured properly? 17. What is VTP? 18. What are the different modes in VTP. What is the default VTP mode? 19. Is Area 0 mandatory in OSPF? Can we configure without any area in OSPF? 20. What are the states in STP? 21. What is time for convergence in STP? 22. Difference between STP and RSTP? 23. What is forward delay in STP? 24. What the different load balancing algorithms? 25. What is the use of PSH in TCP header

ViaSat 1. How does traceroute works 2. What is source learning 3. What is the protocol used for ping 4. Difference between distance vector and link state 5. What happens after you configure OSPF 6. Which routing protocol do u like and why 7. Difference between RIP and OSPF 8. What is feasible successor in EIGRP and how it is chosen 9. What are the different tables in BGP 10. Why is BGP used and explain process of BGP peer formation 11. What happens if any BGP peer is down. How long does a neighbor peer wait? 12. What is seq number in TCP header 13. Why TTL is reduced only at routers 14. What is the default TTL value 15. What is offset? 16. Difference between broadcast and multicast 17. What is header size of UDP 18. ICMP is which layer protocol 19. Can u walk me through the tcp/IP stack 20. UDP runs on which port?

Palo Alto Networks 1. Difference between TCP and UDP 2. Why TCP is reliable? 3. What is TCP header size? 4. What is man in the middle attack 5. Explain public key and private key 6. How does private key process work 7. What is SSL and how it works 8. What is active FTP and Passive FTP 9. What are the two channels in FTP 10. Given IP address and asked for broadcast address 11. What is the traceroute logic 12. What is area 0 in OSPF 13. How does ARP work? 14. Explain VPN process 15. How does DNS work 16. What is DPI 17. What are different DHCP messages 18. Troubleshooting steps: a user is unable to access office email from home. Conditions: a. VPN is connected b. Able to access other office websites c. Able to access email from office and only disconnects at home d. Tried with other home router also - same problem e. Username and password is correct 19. What is loopback address 20. Can u explain how NAT works? 21. Why do we use VTP ? 22. Can we assign interfaces with VTP? 23. If we want to communicate between two VLANs, how can we do it?

Adara Networks 1. Explain about each layer in TCP / IP stack 2. What is the difference between Layer 2 and Layer 3 3. How does ARP work? 4. How does traceroute work? 5. What are the message types in traceroute? 6. Explain STP and it's working 7. Difference between STP and RSTP 8. What is route poisoning and split horizon - explain 9. What are algorithms in load balancing 10. What are port channels 11. What are virtual port channels 12. What is VTP 13. Explain different states in STP 14. Draw the typical data center model ( core, distribution, access) 15. What is VRF and why? 16. VTP default mode? 17. Explain tcp 3way handshake 18. Difference between TCP and UDP 19. What is windowing in TCP 20. What are different port states in RSTP 21. How does DNS resolution takes place 22. How does routes shown in route table 23. What are the routes in route table other than directly connected? 24. What is source learning 25. What is VIP 26. Difference between broadcast and multicast domains. 27. Given a topology - determine broadcast domain and Collision domain 28. What do you know about OpenFlow 29. What is proxy ARP 30. During ARP for google.com, do we get MAC address of google.com server?

Alcatel Lucent 1. Can you tell about OpenFlow in one minute 2. What's the difference between control plane and data plane 3. Do you what are the changes from OpenFlow 1.3 to OpenFlow 1.4 4. Do u know how mininet works? 5. What is Rest API 6. Can we run OSPF and BGP on floodlight controller? 7. Tell me about netstat 8. What are the OpenFlow messages between switch and controller 9. What is para virtualization 10. Do u know how VMware allocates physical resources to virtual resources 11. The MAC address generated by VMware for a VM interface in unique globally? 12. Can we configure switches and routers without logging into each of them individually? 13. How do test which OpenFlow version the machine is running 14. How do check if controller is connected to OVS or not? 15. What is a bridge in OVS? 16. What are the messages exchanged for the first time when controller is connected to OVS 17. How does iPerf work? 18. Which protocol does ping use 19. Why do we need ARP 20. How does trace route works 21. What is flow control in TCP 22. What is fragmentation in TCP 23. What is RTO in TCP 24. What is MTU and how it is handled 25. What happens when you enter a URL in browser and hit enter. 26. What are DNS records 27. What are iterative and recursive messages in DNS 28. What is gratuitous ARP 29. What are the DHCP messages between host and server 30. What happens when I please time is expired. 31. What is the use of offset in TCP 32. What is the use of URG and PSH in TCP. 33. What happens if ACK packet is lost in TCP. How long does client wait? 34. What is the Ack number set by client in TCP header when packet is sending for the first time 35. What if the packet 5 is lost out of 10 packets in TCP. What will be the ack for this. 36. What does client do with the packet received multiple times 37. What is flow table and group table in OpenFlow 38. What happens to a packet which is received on OVS - explain step by step 39. What is a table miss in OpenFlow. 40. What do you have in flow mod messages 41. Does switch send the packet to controller if action is already set? 42. What is the difference between type 1 and type 2 hypervisor 43. What is the difference between KVM and Xen 44. What is round robin algorithm? 45. Solve Dijkstra algorithm for a topology 46. Why do we need seq number for LSAs in OSPF 47. Explain selection method of DR and BDR in OSPF 48. What are the different LSAs in OSPF 49. Explain TCP state machine 50. What is the difference between transit area and stub area 51. What is the function of ASBR. 52. Difference between ASBR and ABR 53. Why do we need area 0 in OSPF 54. Write logic for Fibonacci series 55. Write logic for factorial of a number 56. What are the test cases to test factorial program 57. What are the test cases to check if OpenFlow is installed properly 58. Explain peering process in OSPF 59. What are the 3 tables does BGP keep? 60. What are the attributes in BGP 61. How does peering form in BGP 62. How does OSPF chose shortest path 63. Write test cases for ASBR in OSPF. 64. Draw typical data center model
65. What protocol does keep alive use in port channel 66. What is the difference between Port Channel and virtual port channel 67. How feasible successor is chosen in EIGRP 68. Why do we need virtual links in OSPF 69. Tell me what are the fields in VLAN tag. 70. What is the difference between native VLAN and default VLAN 71. Do u know anything about L3 VLANs 72. What is the IP of multicast in ripv2 73. What is the Destination Mac in arp packet 74. Explain timers in OSPF. 75. Explain STP states. 76. How priority is given to switch and explain process of root bridge ID 77. Given a topology - Explain convergence in STP and RSTP 78. What are the different testing methods