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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相关考题
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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
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单项选择题
Which statement is true?（）
A. An IPv6 address is 64 b long and is represented as hexadecimal characters.
B. An IPv6 address is 32 b long and is represented as decimal digits.
C. An IPv6 address is 128 b long and is represented as decimal digits.
D. An IPv6 address is 128 b long and is represented as hexadecimal characters.
