A MAC address is a ( )address.
A. physical-layer
B. application-layer
C. link-layer
D. network-layer
查看答案
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.
In the LAN, ( )protocol dynamically assign IP addresses to hosts.
A. DNS
B. ARP
C. DHCP
D. IP
In the Ethernet frame structure, the CRC field is ( )bytes.
A. 2
B. 4
C. 8
D. 32
微信支付 
支付宝支付