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助理工程师
 
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发表于 2018-1-24 10:59:13
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VCE 题库里有个问题,请教一下
' t' S8 ^: x4 tQUESTION 79
4 `* J' H; {- HWhich two characteristics of DTLS are true? (Choose two); M4 j, Y8 |& H( M4 o
A. It supports long data transfers and connectionless data transfers.: H/ u2 d* H$ S9 x Y* t
B. It includes a retransmission method because it uses an unreliable datagram transport.
) X" T5 [0 e2 ^% s3 c& sC. It includes a congestion control mechanism.: p( t3 {5 G9 o# i
D. It is used mostly by applications that use application layer object-security protocols.3 O: _$ o9 h2 J1 A4 l* e! j
E. It completes key negotiation and bulk data transfer over a single channel.
- {, _ V9 B' [9 |! rF. It cannot be used if NAT exists along the path.
+ E4 v/ D# I5 n0 d' N答案B E$ G6 I* U4 i' G" z
t8 c3 c0 U4 D' ?# C; @; |
0 g, u6 k3 K' \QUESTION 143% p( f- R' Q) q) F5 L& u; D% M% v
Which two characteristics of DTLS are true?(Choose two)* {% J0 p9 l2 ]: ^0 P F Y
A. It is used mostly by applications that use application layer object-protocols
0 ?- _$ z) O8 CB. It includes a congestion control mechanism+ _& n. Q9 G, }) y5 G
C. It completes key negotiation and bulk data transfer over a single channel.
5 D: k6 b. ^5 c( h: I5 N! \' WD. It supports long data transfers and connectionless data transfers.
8 b# G% x- S8 X5 i1 l0 OE. It cannot be used if NAT exists along the path.9 D8 `& [9 j- Y. y' Y
F. It concludes a retransmission method because it uses an unreliable datagram transport.0 a# @' @9 U1 ]5 u" g
答案:BF8 F( I. h1 \7 B' J: y
' d W1 `; w# M6 R" a
( E' O X* ?# z M7 [所以应该哪个是对的啊' N6 N, {- a' w. z& h+ F2 ^) Z9 k* f
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2018-1-24 10:59:13
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