400-251 VEC题库中有个问题想确认一下

十点半的精灵1

% R. K+ I2 n- W  Z1 l- F400-251 VCE 题库里有个问题，请教一下
QUESTION 79
Which two characteristics of DTLS are true? (Choose two)
A. It supports long data transfers and connectionless data transfers.
B. It includes a retransmission method because it uses an unreliable datagram transport.
C. It includes a congestion control mechanism.
D. It is used mostly by applications that use application layer object-security protocols.
E. It completes key negotiation and bulk data transfer over a single channel.
F. It cannot be used if NAT exists along the path.
答案B E
: c/ e- Z9 u/ h& v5 Z% F! H

! Q& l8 i6 N8 Y) ZQUESTION 143
Which two characteristics of DTLS are true?(Choose two)
A. It is used mostly by applications that use application layer object-protocols
B. It includes a congestion control mechanism
C. It completes key negotiation and bulk data transfer over a single channel.
D. It supports long data transfers and connectionless data transfers.
) U" ^0 k  X$ a/ r9 PE. It cannot be used if NAT exists along the path.
F. It concludes a retransmission method because it uses an unreliable datagram transport.
3 z1 h. o- T7 e" F答案：BF
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- I9 K, ~& Q  H所以应该哪个是对的啊

hellben

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kyd007

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keitcheng

thx.....

coolshun

答案B E