多项选择题

Which two statements are true regarding an Ethernet collision domain?（）

A. If a switch is used, the collision domain is limited to each device and the switch.
B. If a hub is used, the collision domain is limited to each device and the hub.
C. If a hub is used, the collision domain includes all devices connected to the hub.
D. If a switch is used, the collision domain includes all devices connected to the switch.

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单项选择题What is a valid multicast MAC address?（）

A. 00:90:69:9f:ea:46
B. ff:ff:ff:ff:ff:ff
C. 01:00:5e:28:12:95
D. 99:99:99:99:99:99

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: :

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.