Services provided by point-to-point protocol (PPP):
A. frame format
B. establishment of the link
C. flow control
D. sequence numbering
E. authentication
Choose the correct answer from the options given below:

Correct option is A

Point-to-Point Protocol (PPP) is used to establish a direct connection between two network nodes. It provides services such as:
A. Frame format: Defines the structure of data frames.
B. Establishment of the link: Sets up and configures the link for communication.
E. Authentication: Ensures secure communication by verifying the identity of the communicating parties.
While flow control and sequence numbering are important in some protocols, they are not primary services provided by PPP.