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
' `  v% |1 E: v$ B$ hQUESTION 79
3 w' z) K) Y6 X6 ]) E& [Which two characteristics of DTLS are true? (Choose two)
9 j6 a% B5 |" jA. It supports long data transfers and connectionless data transfers.
B. It includes a retransmission method because it uses an unreliable datagram transport.
8 h- h) ?1 F: a( X, W# c. G9 BC. It includes a congestion control mechanism.
( `; z' r) d! C; T$ x% R+ r$ qD. It is used mostly by applications that use application layer object-security protocols.
$ d' N" W6 v" K2 X; V; dE. 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

6 r4 p" E4 [, N3 B8 U( N
QUESTION 143
! ]( V% V% ^) I8 D4 v, b5 [Which two characteristics of DTLS are true?(Choose two)
A. It is used mostly by applications that use application layer object-protocols
7 A7 h0 r( @# Z. ?# G" z% L  b2 y/ dB. 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.
E. 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
- v; v; Y! M* u# i

. V+ g( f  N2 l# Q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
: G: B5 W% F" Fchannel. This property allows applications to simply
replace each datagram socket with a secure datagram
/ j. J. A  D2 csocket managed by DTLS.
DTLS is not intended to provide any congestion control
functionality. Congestion control needs to be addressed
, p# ?# }: N# ]. wby 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

thanks

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coolshun

答案B E

keitcheng

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