2012ccna题库9-10

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'2012ccna题库9-10'
1. Cisco-Chapter91 Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below. 85 90 BA A1 B3 1C 2 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. 3 Which of the following describe interframe spacing? (Choose two.) the minimum interval, measured in bit-times, that any station must wait before sending another frame the maximum interval, measured in bit-times, that any station must wait before sending another frame the 96-bit payload padding inserted into a frame to achieve a legal frame size the 96-bit frame padding transmitted between frames to achieve proper synchronization the time allowed for slow stations to process a frame and prepare for the next frame the maximum interval within which a station must send another frame to avoid being considered unreachable 4 Ethernet operates at which layers of the OSI model? (Choose two.) Network layer Transport layer Physical layer Application layer Session layer Data-link layer 5 In the graphic, Host A has reached 50% completion in sending a 1 KB Ethernet frame to Host D when Host B wishes to transmit its own frame to Host C. What must Host B do? Host B can transmit immediately since it is connected on its own cable segment. Host B must wait to receive a CSMA transmission from the hub, to signal its turn. Host B must send a request signal to Host A by transmitting an interframe gap. Host B must wait until it is certain that Host A has completed sending its frame. 6 What does the IEEE 802.2 standard represent in Ethernet technologies? MAC sublayer Physical layer Logical Link Control sublayer Network layer 7 Refer to the exhibit. Host_A is attempting to contact Server_B. Which statements correctly describe the addressing Host_A will generate in the process? (Choose two.) A packet with the destination IP of Router_B. A frame with the destination MAC address of Switch_A. A packet with the destination IP of Router_A. A frame with the destination MAC address of Router_A. A packet with the destination IP of Server_B. A frame with the destination MAC address of Server_B. 8 Which of the following is a drawback of the CSMA/CD access method? Collisions can decrease network performance. It is more complex than non-deterministic protocols. Deterministic media access protocols slow network performance. CSMA/CD LAN technologies are only available at slower speeds than other LAN technologies. 9 After an Ethernet collision, when the backoff algorithm is inv
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2012 ccna 题库 10
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