Asinine, impersonal, lazy.

If you've ever had a phone discussion with a recruiter from Google, or Apple, or just about any tech company, you're familiar with how they like to find good candidates and match them with teams that fit their skill sets. Recruiters that actually put a little effort into their job.

Don't expect that with F5. F5 recruiters aren't even going to send you an email. They have an assistant who will do that. The assistant will schedule a time for a phone interview, and that's about it.

Then you'll have a phone interview where you are expected to write code on an online whiteboard. This is pretty common practice these days, but that isn't what is really going to happen. Your interviewer is likely to just hang up on you because he doesn't think you could write the code by looking at your resume.

You can assure your interviewer that you read the job description and you have extensive experience in every major area the job description lists. Give examples; sure, that might help. You can assure them that you can work with the programming language he mentions. But you should just save your effort and pride and just say, "Thank you. Have a nice day." because they couldn't be bothered to let you even attempt the coding exercise you were told to prepare for, because they can't fathom how someone with your resume and experience could even begin to use the specific language they like to use.

The recruiter will still not email you.

Do you have experience with network protocol development and implementation?