传输时延（Delay or Latency）

[名词解释] 时延变化（Delay Variation）

[判断题] TCP传输的重发时延应略大于平均往返时延。A . 正确B . 错误

[判断题] 传输时延过大，容易引起声学回声，特别是长途呼叫时。需要估算长途呼叫时的传输时延、软交换时延等。在移动用户呼叫固网用户时比较明显。（）A . 正确B . 错误

[试题]通常情况下采用Ping包的方式测试Round Trip Delay(往返时延的总和)，包括test laptop,和()设备()A． user terminalB．eNodeBC．PDN GWD．target server

[判断题] 卫星传输单向时延约为270ms，卫星传输双向时延（称为一跳）约为540ms。A . 正确B . 错误

[单选题]Serialization delay and(71)delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the(72)on the wire, and queuing delay(depth of the queue)are improved by

[试题] Serialization delay and （71） delay are the two components of network delay that are improved by increasing bandwidth. Serialization delay, i.e. the amount of time it takes to put the （72） on the wire, and queuing delay (depth of the queue) are improv

[单选题]PING包时延主要由两大部分时延构成，包括_A．UU口时延B．X2口时延C．传输时延D．Iub口时延

[主观题]D．DN的层传输速率高，网络时延小。（）此题为判断题(对，错)。

[单选题]下列数据交换方式中，（）传输时延最大。A . 电路交换B . 报文交换C . 分组交换