CCNA1 - Module 6 Exam Answers (2008-4-13-PM-21:40)
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. 2. How many hexadecimal digits are in a MAC address? • 2 • 8 • 12 • 16 • 32 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. 4. At what layer of the OSI model does a MAC address reside? • 1 • 2 • 3 • 4 • 7 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 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 8. Which two devices can provide full-duplex Ethernet connections? (Choose two.) • hub • modem • repeater • NIC • Layer 2 switch 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 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 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. 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. • 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. 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. 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. 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 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. 17. In which two layers of the OSI model does Ethernet function? (Choose two.) • application • session • transport • network • data link • physical 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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