超星 - 自测题 ch5

单选题

MAC address is ( ) bits long.

A. 32
B. 48
C. 128
D. 64

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单选题

The following protocols are belonging to multiple access protocols except for ( ).

A. channel partitioning protocols
B. routing protocols
C. random access protocols
D. taking-turns protocols

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单选题

Which of the following is not belonging to channel partitioning protocols? ( )

A. CSMA
B. FDM
CDMA
D. TDM

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单选题

In the following four descriptions about CSMA/CD, which one is not correct? ( )

A node listens to the channel before transmitting.
B. If someone else begins talking at the same time, stop talking.
C. A transmitting node listens to the channel while it is transmitting.
D. With CSMA/CD, the collisions can be avoided completely.

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单选题

( ) provides a mechanism for nodes to translate IP addresses to link-layer address.

A. IP
B. ARP
C. RARP
DNS

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单选题

A MAC address is a ( )address.

A. physical-layer
B. application-layer
C. link-layer
D. network-layer

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单选题

Which of the following is correct? ( )

A. No two adapters have the same MAC address.
B. MAC broadcast address is FF-FF-FF-FF-FF-FF.
C. A portable computer with an Ethernet card always has the same MAC address, no matter where the computer goes.
D. All of the above

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单选题

In the following four descriptions, which one is not correct? ( )

ARP resolves an IP address to a MAC address.
B. DNS resolves hostnames to IP addresses.
C. DNS resolves hostnames for hosts anywhere in the Internet.
D. ARP resolves IP addresses for nodes anywhere in the Internet.

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单选题

In the LAN, ( )protocol dynamically assign IP addresses to hosts.

A. DNS
B. ARP
C. DHCP
D. IP

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单选题

In the Ethernet frame structure, the CRC field is ( )bytes.

A. 2
B. 4
C. 8
D. 32

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