Broadcom

Broadcom Telephonic Round

1. Difference between trap and Inform.
2. Enhancements done in SNMP V2 over V1. V3 over V2 and V1.
3. How Security is achieved in SNMP V3.
4. Different types of error messages sent from agent.
5. Given three indices of string type, explain the order of Get-Next command output.
6. How are traps received by a manager.
7. What is the difference between counter and gauge.
8. What are the IPC mechanisms used by SNMP in a process based model
9. What are the ports used by SNMP.
10. Is it possible to do a SNMP V3 GET on  an agent that has been operating since 2 days even though no action was performed on the agent continuously.
11. Use of SNMP Engine ID.
12. Few questions asked about MIB generation, Code generation to be used in the image.
13. What are the default traps available.
14. What are the contents of a trap.
15. What is a proxy agent.
16. Test tools used like Silver Creek, and questions relevant to them.
17. What are the initial messages exchanged between Manager and the Agent in a SNMP V3.
18. How are the counters populated and retrieved by the Agent.
19. Which is better, process based model or thread based model. Which is preferred when.
20. Why is it that only one port is used while tx and Rx in a LAG when the src mac address is the same. How do you address reordering problem in LAG. What if any specific frame is lost. Which layer handles loss of frames.
21. Difference between TCAM and normal CAM. What is advantageous. 
22. What are the contents of trap?


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Second Round

Boradcom Skype Interview

1. *p++ what does it do when assigned to any variable.
2. const char *p ,char *const p , const * char p differences.
3. inserting node in the middle of a linked list.

4. What is the difference between STP, RSTP, MSTP. Explain how the convergence is achieved in RSTP. What are the port states that are present in each of the versions.
5. Explain LAG. Why it is not supported on a half duplex port. What is a static LAG.
6. Given two images used intermittently in a single RAM, how do you ensure proper communication between the two images in case each image wants to share some information with other.
7. What is alignment for a structure node { char c1;int n1;char c2;int n2;}. How can you avoid alignment problems.
8. What is the difference in behavior between ingress filtering enabled and disabled. How will it behave for tagged and untagged frames received on a port.
9. What is an ACL, TCAM. How are the rules prioritized in ACL. What are the actions available. What will the TCAM do in case there are multiple similar rules. Will it check for all the protocols configured for denial or accept?
10. What are the IPC mechanisms in Linux.
11. Design process done in the company. Testing methodologies used.
12. What is the relation between STP and LACP. Any specific scenario?
13.What is QinQ? how is it used and where is it used
14. Explain all the process involved in retrieving the webpage yahoo.com
15. List all the protocols that are used in the above process.
16. what are SAP's in networking where are they?

17. What does a ping do? will it call the ICMP application ?


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