单项选择题

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

A. Frame Relay
B. HDLC
C. x.25
D. PPP

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热门试题

单项选择题

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?（）

A. after broken links are re-established
B. in an improperly implemented redundant topology
C. when upper-layer protocols require high reliability
D. during high traffic periods
E. when a dual ring topology is in use

单项选择题

Which command sets and automatically encrypts the privileged enable mode password?（）

A. enbale password c1sco
B. secret enable c1sco
C. password enable c1sco
D. enable secret c1sco