[2017年整理]CCNA第三学期英文答案chapter2.doc

1. When a collision occurs in a network using CSMA/CD, how do hosts with data to transmit respond after the backoff period has expired? The hosts return to a listen-before-transmit mode. The hosts creating the collision have priority to send data. The hosts creating the collision retransmit the last 16 frames. The hosts extend their delay period to allow for rapid transmission. 2. Refer to the exhibit. The switch and workstation are administratively configured for full-duplex operation. Which statement accurately reflects the operation of this link? No collisions will occur on this link. Only one of the devices can transmit at a time. The switch will have priority for transmitting data. The devices will default back to half duplex if excessive collisions occur 3. Refer to the exhibit. What action does SW1 take on a frame sent from PC_A to PC_C if the MAC address table of SW1 is empty? SW1 drops the frame. SW1 floods the frame on all ports on SW1, except port Fa0/1. SW1 floods the frame on all ports on the switch, except Fa0/23 and Fa0/1. SW1 uses the CDP protocol to synchronize the MAC tables on both switches and then forwards the frame to all ports on SW2 4. When a switch receives a frame and the source MAC address is not found in the switching table, what action will be taken by the switch to process the incoming frame? The switch will request that the sending node resend the frame. The switch will issue an ARP request to confirm that the source exists. The switch will map the source MAC address to the port on which it was received. The switch ends an acknowledgement frame to the source MAC of this incoming frame 5. Refer to the exhibit. The switch and the hub have default configurations, and the switch has built its CAM table. Which of the hosts will capture a copy of the frame when workstation A sends a unicast packet to workstation C? workstation C workstations B and C workstations A, B, C, and t