单项选择题

In the MAC address 00: : :9f:eA. , what represents the Organizationally Unique Identifier (OUI)?（）

A. :9f:eA
B. 00: : :9f
C. 9f:eA
D. 00: :

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多项选择题

Which two fields are found in an Ethernet frame header?（）

A. TTL
B. flags
C. checksum
D. type

多项选择题

Which two statements are correct about Layer 2 broadcast frames?（）

A. Layer 2 broadcast frames are processed by all devices on the same VLAN
B. Layer 2 broadcast frames are discarded by routers that connect to multiple VLANs
C. Layer 2 broadcast frames are relayed by routers to all connected VLANs
D. Layer 2 broadcast frames are relayed by switches to devices on the same VLAN

多项选择题

Which two statements accurately describe a broadcast domain?（）

A. Broadcast domains require that the participating devices connect to common switches or hubs
B. Broadcast domains consist of devices reachable by frames addressed to the Layer 2 broadcast address
C. Broadcast domains require a gateway device such as a router
D. Broadcast domains consist of devices that reside on the same VLAN