ccna第六章练习答案
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时间：2025-09-27 06:23:31
ccna第六章练习答案
窗体顶端1.Refertotheexhibit.HostAiscommunicatingwithhostF.WhathappenstoaframesentfromhostAtohostFasittravelsovertheEthernetsegments?Theframeformatismodifiedasitpassesthrougheachswitch.TheframeformatremainsthesameacrosseachEthernetsegment.Theframeformati
导读窗体顶端1.Refertotheexhibit.HostAiscommunicatingwithhostF.WhathappenstoaframesentfromhostAtohostFasittravelsovertheEthernetsegments?Theframeformatismodifiedasitpassesthrougheachswitch.TheframeformatremainsthesameacrosseachEthernetsegment.Theframeformati
窗体顶端
1. Refer to the exhibit. Host A is communicating with host F. What happens to a frame sent from host A to host F as it travels over the Ethernet segments? |
| The frame format is modified as it passes through each switch. |
| The frame format remains the same across each Ethernet segment. |
| The frame format is modified as the media speed changed at switch B and switch E. |
| The frame format is modified as the media material changes between copper and fiber at switch C and switch D. |
窗体顶端
| 2. How many hexadecimal digits are in a MAC address? |
| 2 |
| 8 |
| 12 |
| 16 |
| 32 |
| 窗体顶端 3. What are three functions of a NIC in a PC? (Choose three.) |
| A NIC connects the PC to the network media. |
| A NIC detects collisions on the Ethernet segment. |
| A NIC checks the formatting of data before it is transmitted. |
| A NIC passes the contents of selected frames to the upper OSI layers. |
| A NIC acknowledges and retransmits data that was not received properly. |
| A NIC discards frames when the destination IP address does not match the local host. |
| 窗体顶端 4. At what layer of the OSI model does a MAC address reside? |
| 1 |
| 2 |
| 3 |
| 4 |
| 7 |
| 窗体底端 |
| 窗体顶端 5. A router has an Ethernet, Token Ring, serial, and ISDN interface. Which interfaces will have a MAC address? |
| serial and ISDN interfaces |
| Ethernet and Token Ring interfaces |
| Ethernet and ISDN interfaces |
| Token Ring and serial interfaces |
窗体顶端
| 6. In an Ethernet LAN, how does the NIC know when it can transmit data? |
| An Ethernet NIC transmits data as soon as the frame is received. |
| An Ethernet NIC transmits data as soon as the NIC receives a token. |
| An Ethernet NIC transmits data when it senses a collision. |
| An Ethernet NIC transmits data after listening for the absence of a signal on the media. |
| 7. Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)? (Choose three.) |
| reliable |
| point-to-point |
| nondeterministic |
| connection-oriented |
| collision environment |
| first-come, first-served approach |
| 窗体顶端 8. Which two devices can provide full-duplex Ethernet connections? (Choose two.) |
| hub |
| modem |
| repeater |
| NIC |
| Layer 2 switch |
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| 9. On a local area network, one workstation can send data on the line while it is receiving data. What type of data transfer does this describe? |
| hybrid |
| half duplex |
| full duplex |
| multilink |
窗体顶端
10. Refer to the exhibit. The small office network shown in the exhibit consists of four computers connected through a hub. Which configuration would cause collisions and errors on the network? |
| autonegotiation |
| FastEthernet |
| peer-to-peer shared resources |
| administratively configured full duplex |
| 窗体顶端 11. 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. |
| 窗体顶端 12. Refer to the exhibit. All hosts are in listen mode. Host 1 and Host 4 both transmit data at the same time. How do the hosts respond on the network? (Choose two.) |
| Hosts 1 and 4 may be operating full duplex so no collision will exist. |
| The hub will block the port connected to Host 4 to prevent a collision. |
| After the end of the jam signal, Hosts 1, 2, 3, and 4 invoke a backoff algorithm. |
| When the four hosts detect the collision, Hosts 1, 2, 3, and 4 generate a jam signal. |
| Hosts 1 and 4 are assigned shorter backoff values to provide them priority to access the media. |
| If a host has data to transmit after the backoff period of that host, the host checks to determine if the line is idle, before transmitting. |
窗体顶端
| 13. 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. |
| 窗体顶端 14. Which statement describes how CSMA/CD on an Ethernet segment manages the retransmission of frames after a collision occurs? |
| The first device to detect the collision has the priority for retransmission. |
| The device with the lowest MAC address determines the retransmission priority. |
| The devices on the network segment hold an election for priority to retransmit data |
| The devices transmitting when the collision occurs DO NOT have priority for retransmission. |
| 窗体顶端 15. Refer to the exhibit. A technician wants to increase the available bandwidth for the workstation by allowing the switch and the NIC on the workstation to transmit and receive simultaneously. What will permit this? |
| CSMA/CD |
| full-duplex |
| FastEthernet |
| crossover cable |
| 窗体底端 |
| 窗体顶端 16. Why do hosts on an Ethernet segment that experience a collision use a random delay before attempting to transmit a frame? |
| A random delay is used to ensure a collision-free link. |
| A random delay value for each device is assigned by the manufacturer. |
| A standard delay value could not be agreed upon among networking device vendors. |
| A random delay helps prevent the stations from experiencing another collision during the transmission. |
窗体顶端
| 17. In which two layers of the OSI model does Ethernet function? (Choose two.) |
| application |
| session |
| transport |
| network |
| data link |
| physical |
窗体顶端
| 18. Which of the following are specified by IEEE standards as sublayers of the OSI data link layer? (Choose two.) |
| Logical Link Control |
| Logical Layer Control |
| Media Access Control |
| Logical Link Communication |
| Media Access Communication |
| Physical Access Communication |
| 19. Where does the MAC address originate? |
| DHCP server database |
| configured by the administrator |
| burned into ROM on the NIC card |
| network configuration on the computer |
| included in the creation of the processor chip |
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ccna第六章练习答案
窗体顶端1.Refertotheexhibit.HostAiscommunicatingwithhostF.WhathappenstoaframesentfromhostAtohostFasittravelsovertheEthernetsegments?Theframeformatismodifiedasitpassesthrougheachswitch.TheframeformatremainsthesameacrosseachEthernetsegment.Theframeformati
