Transport-layer protocols run in ____.
A. Servers
B. Clients
C. Routers
D. End systems
查看答案
In transport layer, the send side breaks application messages into ____, passes to network layer.
A. Frames
B. Segments
C. Data-grams
D. bit streams
Services provided by transport layer include ____.
A. HTTP and FTP
B. TCP and IP
C. TCP and UDP
D. SMTP
Which of the following services is not provided by TCP?
A. Delay guarantees and bandwidth guarantees
B. Reliable data transfers and flow controls
Congestion controls
D. In-order data transfers
These two minimal transport-layer services----____ and ____----are the only two services that UDP provides!
A. process-to-process data delivery, error checking
B. congestion control, reliable data transfer
C. flow control, congestion control
D. In-order data transfer, error checking
微信支付 
支付宝支付