单项选择题

At which layer of the OSI model does error checking occur with IPv6?（）

A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 7

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多项选择题

Which two statements are true about optical networks?（）

A. SONET and SDH both use time-division multiplexing.
B. An optical transport network system uses time-division multiplexing.
C. SONET and SDH both use wavelength-division multiplexing.
D. An optical transport network system uses wavelength-division multiplexing.

多项选择题

Which two statements are true about TCP communication?（）

A. The receiver acknowledges the final packet in each communications stream.
B. The receiver adds sequencing numbers to the packets received.
C. The sender adds sequencing numbers to the packets it sends.
D. The receiver acknowledges each packet it receives from the sending device.

多项选择题

A user opens a webpage that requires the transmission of packets from the Web server to the client's browser. The packets transmitted from the Web server to the client exceed the smallest MTU value on the communications path.
Which two protocol functions allow this type of communication?（）

A. packet segmentation
B. serialized checking
C. packet sequencing
D. parallel checking