多項選擇題In computer networking a multicast address is an identifier for a group of hosts that have joined amulticast group. Multicast addressing can be used in the Link Layer （OSI Layer 2）， such as Ethernet Multicast， as well as at the Internet Layer （OSI Layer 3） as IPv4 or IPv6 Multicast. Whichtwo descriptions are correct regarding multicast addressing？（）

A、The first 23 bits of the multicast MAC address are 0x01-00-5E. This is a reserved value thatindicates a multicast application
B、The last 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast application
C、To calculate the Layer 2 multicast address， the host maps the last 23 bits of the IP address intothe last 24 bits of the MAC address. The high-order bit is set to 0
D、The first 3 bytes （24 bits） of the multicast MAC address are 0x01-00-5E. This is a reservedvalue that indicates a multicast application


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A.show ip ospf
B.show ip route
C.show ip protocols
D.show ip ospf database
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3.單項選擇題Which command would display OSPF parameters such as filters，default metric，maximum paths，and number of areas configured on a outer（）

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4.多項選擇題An OSPF link can be in multiple states at any givenmoment(ie.Exstart,exchange,full). Which two IOS commands let you view the state of the link（）

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C.show ip ospfneighbor
D.show ip ospfinterface

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