下列模式中， ______是用户模式。

A. user@router# traceroute 10.10.10.10

B. user@router> ping record-route 10.10.10.10

C. user@router>traceroute 10.10.10.10

D. user@router# run traceroute 10.10.10.10

E. user@router# ping record-route 10.10.10.10

2 (a) Explain the term ‘backflush accounting’ and the circumstances in which its use would be appropriate.

(6 marks)

A．FTP

B．SSH

C．UDP

D．HTTPS

E．Traceroute

A．A.I would

B．B.would I

C．C.to which

D．D.for which

A、This would help prevent people discarding their litter recklessly.

B、This would help stop people discarding their litter willy-nilly.

C、/

D、/

A、failure to exercise the care toward others which a reasonable or prudent person would do in the circumstances, or taking action which such a reasonable person would not.

B、the act of making untrue statements about another which damages his/her reputation.

C、from the Latin fiducia, meaning 'trust,' a person (or a business like a bank or stock brokerage) who has the power and obligation to act for another (often called the beneficiary) under circumstances which require total trust, good faith and honesty.

D、To determine the liabilities and apportion the assets of esp. in bankruptcy or dissolution

A、the means to achieve justice in any matter in which legal rights are involved.

B、To come to an end in time or effect

C、the act of making untrue statements about another which damages his/her reputation.

D、failure to exercise the care toward others which a reasonable or prudent person would do in the circumstances, or taking action which such a reasonable person would not.

A．A

B．B

C．A & B

D．Neither