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.

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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

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