扁桃体既是淋巴器官,也是内分泌器官。
A. 对
B. 错
Suppose two hosts, A and B, are separated by 10,000 kilometers and are connected by a direct link of R = 2 Mbps. Suppose the propagation speedover the link is 2.5*10^8 meters/sec.
A. The value of the bandwidth-delay product is ( ) bit. (Notice: the bandwidth-delay product = R*d(prop), and d(prop) is the propagation rate.)
B. Consider sending a file of 800,000 bits from Host A to Host Suppose the file is sent continuously as one large message. What is the maximumnumber of bits that will be in the link at any given time? ( )
Consider sending a file of 8000 bits from Host A to Host Suppose the file is sent continuously as one large message. What is the maximumnumber of bits that will be in the link at any given time? ( )
D. What is the width (in meters) of a bit in the link? ( )
E. Derive a general expression for the width of a bit in terms of the propagation speed s, the transmission rate R, and the length of the link m.
Consider sending a 999 byte datagram into a link that has an MTU of 500 bytes, ().
A. 2 fragments are created with offset field value 0, 500, respectively
B. 3 fragments are created with offset field value 0, 480,960, respectively
C. 3 fragments are created with offset field value 0, 60,120, respectively
D. None of the above
[ 判断题 ] 客户使用SMTP既能发送邮件又能接受邮件。 ( )
A. 对
B. 错
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