Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?

IT Questions BankWhich Layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?
Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms? 1ITExamAnswers Staff asked 6 months ago
Question:
Which Layer 2 protocol encapsulation type supports synchronous and asynchronous circuis and has built-in security mechanisms?

  • HDLC
  • PPP
  • X.25
  • Frame Relay

Explanation: PPP supports both synchronous (like analog phone lines) and asynchronous circuits (such as ISDN or digital links). With synchronous circuits we need to use clock rate.

Note: Serial links can be synchronous or asynchronous. Asynchronous connections used to be only available on low-speed (<2MB) serial interfaces, but now, there are the new HWICs (High-Speed WAN Interface Cards) which also support asynchronous mode. To learn more about them please visit

http://www.cisco.com/en/US/prod/collateral/modules/ps5949/ps6182/prod_qas0900aecd80274424.html.

More Questions: CCNA v3.0 (200-125) Study Guide – Exam Dumps


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