They give a typical computer science type interview. My advice is bone up on your basic algorithms and be able to regurgitate them from memory. It is disappointing they don't ask any "real world" questions but seem to stick to questions that are easy if you studied your college textbooks the night before but harder if your college days were a few years back.

You might be given a simple programming skills test. Bring a pencil; if they spend 5 minutes looking for one for you to do the test, it detracts from your time to do it!

When setting up a TCP connection, how do you determine the MSS?

Describe all the states in the TCP connection state machine.