Qualcomm Interview Question for Software Engineer / Developers






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Ok...here's the list of answers I gave

Answers (according to Q nos.)
1. The scope/visibility is limited to that particular file.
2. A word/line is evicted when the dirty bit is already set and the current access operation is again a 'write'
3. Protection of selected memory segments/pages. The mapping table also has a protection bit for each page table entry(this generates write/read-protection exception I guess)
4. ARP - Given the MAC, get IP addr (didnt conveyed this correctly !)
DHCP - assign IP given the MAC (also called RARP I guess)
5. No use of dynamic mem functions, printfs, no locking mechanisms like semtake/semwait (though semgive/sempost is allowed),
If Floating point operations used, explicitly save FP regs in the context..
The he asked what are the functions to save FP regs in VxWorks(since I had put some VxWorks exp in my Resume)..ans is..fppsave and fpprestore (I didnt ans this !)

General Comments:
The job description was very exhaustive..included evrything from comp arch, OS, n/w to scripting, distributed OS, DSP.
I feel since it was a corporate R & D, they wanted a 'jack(master) of all' kinda person
I was not able to clear this round. I feel I didn't answer convincingly bcoz this was my 1st interview and hence didn't know what/how exactly to prepare, what/what not to expect and how to answer to questions based on my exp.

Anyways, the interview was really a gr8 learning exp..& I hope this helps others too..

-Sandeep

- Sandeep Marathe October 12, 2008 | Flag Reply
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Oops...I had written a single post..but the questions have been split up in no. of diff categories..
For all the Qs posted by me (Sandeep Marathe), u will find ans here...
Others pls add to these ans/correct if anything wrong

- Sandeep Marathe October 12, 2008 | Flag
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Reg 4. It is the otherway around. Given the IP address, get the MAC. Reg DHCP, not necessarily a MAC is required to get the IP. DHCP server assigns IP in the configured range on request. However, one can hard bind the MAC-IP.

- Selva February 12, 2009 | Flag Reply
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Reg 4. It is the otherway around. Given the IP address, get the MAC. Reg DHCP, not necessarily a MAC is required to get the IP. DHCP server assigns IP in the configured range on request. However, one can hard bind the MAC-IP.

- KK February 12, 2009 | Flag Reply
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When IP Address is known, we can know MAC or hardware address

- Linkan Chen, UFL, 1-352-328-6704 February 04, 2011 | Flag Reply


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