400-251 VEC题库中有个问题想确认一下

十点半的精灵1

400-251 VCE 题库里有个问题，请教一下
7 }7 |' R" _  A% P. bQUESTION 79
, g5 F5 f! D: T/ VWhich two characteristics of DTLS are true? (Choose two)
. K3 p$ F3 u* n# e& v' I1 S9 q( IA. 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.
9 V- ?1 k! a1 j! n/ RF. It cannot be used if NAT exists along the path.
1 O7 Q% C# C1 n答案B E
/ x" G5 e: S* w
& g5 E+ t: c: p
QUESTION 143
Which two characteristics of DTLS are true?(Choose two)
A. It is used mostly by applications that use application layer object-protocols
% C5 ^  T6 Z; k+ C6 dB. It includes a congestion control mechanism
C. It completes key negotiation and bulk data transfer over a single channel.
4 _# B  H0 X( O! m, o, r1 H+ l$ }D. It supports long data transfers and connectionless data transfers.
2 I" q( f5 a8 Z% r. O; g* w; pE. It cannot be used if NAT exists along the path.
F. It concludes a retransmission method because it uses an unreliable datagram transport.
答案：BF
  u7 Y3 n& c0 i; p1 B8 I

所以应该哪个是对的啊

梦里梦境太长

我选的 It completes key negotiation and bulk data transfer over a single channel.
原因：比It includes a congestion control mechanism长

googlehh010

Datagram Transport DTLS must be able to complete
key negotiation and bulk data transfer over a single datagram
  |9 u( ?2 o+ P$ M7 _2 D! Zchannel. This property allows applications to simply
replace each datagram socket with a secure datagram
socket managed by DTLS.
DTLS is not intended to provide any congestion control
functionality. Congestion control needs to be addressed
5 l6 E1 \* Q9 W! a$ G% k4 R- \: xby a datagram transport using application regardless of
whether a security layer is in place, and hence is beyond
the scope of DTLS.

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ahmadomari

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coolshun

答案B E

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