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.
查看答案
( ) provides a mechanism for nodes to translate IP addresses to link-layer address.
A. IP
B. ARP
C. RARP
DNS
A MAC address is a ( )address.
A. physical-layer
B. application-layer
C. link-layer
D. network-layer
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
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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