What is the difference between the ISO version of HDLC and the Cisco version of HDLC that is used, by default, on all serial interfaces?
A) Type field
B) Protocol field
C) Authentication support
D) Optimized header
E) Encryption support

Name: What is the difference between the ISO version of HDLC and the Cisco version of HDLC that is used, by default, on all serial interfaces? A) Type field B) Protocol field C) Authentication support D) Optimized header E) Encryption support
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The Answer is A

What Is the Difference Between the ISO Version of HDLC