(10 , 2 ) 1. In Ethernet, the devices are identified by ( ). A. LLC address B. MAC address C. IP address D. IPX address 2. The segments in transport layer is demultiplexed to different application processes via ( ). A. physical address B. port number C. IP address D. logical address 3. Network interface card (NIC) can realize the functions of ( ). A.physicallayerB.linklayerC.physicallayerandlinklayerD.linklayerandnetworklayer 4. In Internet, ( ) protocol provides services of hostname-to-IP-address translation. A. POP B. DNS C. ARP D. NAT 5. Ipv6 can extend the IP address into ( ). A. 64 bit B. 128 bit C. 256 bit D. 1024 bit