A few networking stocks are rallying in response to F5's (FFIV +5.5%) better-than-feared results and guidance. RVBD +3.2%. CTXS +1.5%. FTNT +2.2%. FIRE +2.1%. F5 noted on its earnings call it saw 20% Y/Y growth in telco sales (mobile/cloud-driven), and was able to displace Cisco (previous) at 3 Fortune 50 companies. U.S. federal was a weak spot, and $50M worth of shares were repurchased. William Blair thinks F5's diversification efforts are paying off.