单项选择题

Which statement is true regarding an Ethernet collision domain?（）

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

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多项选择题

Two devices on an Ethernet segment sent frames at the same time causing a collision.Which two statements are true?（）

A. Both devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.
B. The device with the lowest MAC address is permitted to retransmit first.
C. The device with the lowest MAC address sends a jam signal to notify all other devices of the collision.
D. Both devices send a jam signal to notify all other devices of the collision.

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.

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