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byte hexadecimal number. 24. The hardware address or MAC address is a a. 6 byte b. 8 byte c. 12 byte d. 16 byte 25. The address resolution Protocol (ARP) is used to a. find the IP address corresponding to MAC addresses b. find the port address corresponding to an IP address c. find the MAC address corresponding to an IP address d. find the IP address from the DNS 26. Which of the following statement is/are true with regard to a 48-port hub? a. it includes one collision domain and one broadcast domain b. it includes 48 collision domains and 48 broadcast domains c. it includes 48 collision domains and one broadcast domain d. it includes one collision domain and 48 broadcast domains 27. Ethernet hubs operate at layer , LAN switches work at layer work at layer a. 3,2,1 b. 1.2.3 c. 2.3.1 d. none of the above and Routers 28. In the work area below identify the OSI model layer to its description Layer A) Transport B) Data Link C) Physical D) Network Description (1)Framing (2)End to end connection (3)Routing (4) Conversion to bits 29. The contention method used by Ethernet is called a. Token Passing b. CSMA/CD c. Polling d. CSMA/CA 30. In which of the following situations can you not use full duplex? a. with a connection from a switch to a switch b. with a connection from a router to a router c. with a connection from a host to a host d. with a connection from a host to a hub 31. VLANs break up collision domains. a. Truc b. False