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