单项选择题

Which layer in the OSI model is responsible for translating frames into bits?（）

A. Application Layer
B. Presentation Layer
C. Data Link Layer
D. Physical Layer

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多项选择题

What are three characteristics of UDP?（）

A. UDP is faster than TCP
B. UDP operates at the Transport Layer
C. UDP is connection-oriented
D. UDP data is sent best-effort
E. UDP is more reliable than TCP

单项选择题

Which simplified IPv6 address is the same as the IP address 2001:0000:1000:0000:0000:cbff:0020:0001/64?（）

A. 2001::1::cbff:2:0001/64
B. 2001::1000::cbff:20:1/64
C. 2001:0:1000::cbff:20:1/64
D. 2001:0:1:0:0:cbff:2:1/64

单项选择题

What is a valid IPv6 address?（）

A. 00:05:85:23:45:67
B. 127.0.0.1
C. 2001:0db8:3000:2215:0000:0000:aaaa:1111
D. 49.0001.0192.0168.1001.00