400-251 VEC题库中有个问题想确认一下

十点半的精灵1

/ n  s: K5 T. W/ ~0 @400-251 VCE 题库里有个问题，请教一下
QUESTION 79
8 |4 `6 W1 t; G( r8 l/ XWhich two characteristics of DTLS are true? (Choose two)
A. It supports long data transfers and connectionless data transfers.
# p* c! ]6 z0 _1 vB. It includes a retransmission method because it uses an unreliable datagram transport.
C. It includes a congestion control mechanism.
( B7 `. p7 |: `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.
4 ~0 p1 b6 Q/ [; q* rF. It cannot be used if NAT exists along the path.
答案B E
* K( x7 F. C5 ^5 M7 @, e4 ^$ K- k
& I  X$ a3 O3 T$ S, A7 n
+ p3 J% \6 G2 v: kQUESTION 143
; O8 _* [- [- ]Which two characteristics of DTLS are true?(Choose two)
A. It is used mostly by applications that use application layer object-protocols
1 E* j0 J3 l+ o, B+ T/ SB. It includes a congestion control mechanism
C. It completes key negotiation and bulk data transfer over a single channel.
% Q+ b. G1 z) r: ZD. It supports long data transfers and connectionless data transfers.
$ Q( ]( ~9 R/ \1 _# vE. It cannot be used if NAT exists along the path.
F. It concludes a retransmission method because it uses an unreliable datagram transport.
4 I) O& a# ^+ U/ a2 I" |) W5 J答案：BF


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.
$ g; R- w! E7 Q7 n原因：比It includes a congestion control mechanism长

googlehh010

Datagram Transport DTLS must be able to complete
" A& z/ S  B: j0 ~5 z5 Nkey negotiation and bulk data transfer over a single datagram
channel. This property allows applications to simply
1 z7 {% ^( s' @, x3 a: Creplace each datagram socket with a secure datagram
, y/ }' y0 I  ^) U) B: F# rsocket managed by DTLS.
0 l* @, [4 e! j/ o+ ]9 `DTLS is not intended to provide any congestion control
9 I# t* }4 {8 k  O- Jfunctionality. Congestion control needs to be addressed
; y  R9 I3 s1 lby a datagram transport using application regardless of
$ E0 a' Y7 w8 mwhether a security layer is in place, and hence is beyond
3 [' R* i7 z% {9 k7 _( w! \% T0 Gthe scope of DTLS.

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ahmadomari

thanks

shyshysh448

coolshun

答案B E

keitcheng

thx.....

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