多项选择题

Which two statements about MPLS label-switched paths (LSPs) are true? （）

A. LSPs are bidirectional.
B. LSPs are unidirectional.
C. LSPs must follow the IGP's shortest path.
D. LSPs can follow paths other than the IGP's shortest path.

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单项选择题

Which statement is correct regarding IPv6 addresses?（）

A. An IPv6 address consists of 128 bits separated into eight 16-bit hexadecimal sections.
B. An IPv6 address consists of 64 bits separated into four 16-bit hexadecimal sections.
C. An IPv6 address consists of 128 bits separated into sixteen 8-bit hexadecimal sections.
D. An IPv6 address consists of 64 bits separated into eight 8-bit hexadecimal sections.

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

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.