How many HDLC controllers does each port support? 09/18/2018 – by Mod_GuideK 0 On a 3-port CT3 card, how many HDLC controllers does each port support? A. 64 B. 128 C. 512 D. 1024 SHOW ANSWERSCorrect Answer: B Explanation/Reference: Download Printable PDF. VALID exam to help you PASS.