1. Ethernet operates at which layers of the OSI model? (Choose two.)
• Network layer
• Transport layer
• Physical layer
• Application layer
• Session layer
• Data-link layer
2. Refer to the exhibit. Which option correctly identifies content that the frame data field may contain?
• preamble and stop frame
• network layer packet
• physical addressing
• FCS and SoF
3. Which two features make switches preferable to hubs in Ethernet-based networks? (Choose two.)
• reduction in cross-talk
• minimizing of collisions
• support for UTP cabling
• division into broadcast domains
• increase in the throughput of communications
4. What are the two most commonly used media types in Ethernet networks today? (Choose two.)
• coaxial thicknet
• copper UTP
• coaxial thinnet
• optical fiber
• shielded twisted pair
5. 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.
6. What are three functions of the upper data link sublayer in the OSI model? (Choose three.)
• recognizes streams of bits
• identifies the network layer protocol
• makes the connection with the upper layers
• identifies the source and destination applications
• insulates network layer protocols from changes in physical equipment
• determines the source of a transmission when multiple devices are transmitting
7. Which statements correctly describe MAC addresses? (Choose three.)
• dynamically assigned
• copied into RAM during system startup
• layer 3 address
• contains a 3 byte OUI
• 6 bytes long
• 32 bits long
8. What three primary functions does data link layer encapsulation provide? (Choose three.)
• addressing
• error detection
• frame delimiting
• port identification
• path determination
• IP address resolution
9. What is the primary purpose of ARP?
• translate URLs to IP addresses
• resolve IPv4 addresses to MAC addresses
• provide dynamic IP configuration to network devices
• convert internal private addresses to external public addresses
10. What does the IEEE 802.2 standard represent in Ethernet technologies?
• MAC sublayer
• Physical layer
• Logical Link Control sublayer
• Network layer
11. 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.
12. After an Ethernet collision, when the backoff algorithm is invoked, which device has priority to transmit data?
• the device involved in the collision with the lowest MAC address
• the device involved in the collision with the lowest IP address
• any device in the collision domain whose backoff timer expires first
• those that began transmitting at the same time
13. Host A has an IP address of 172.16.225.93, a mask of 255.255.248.0, and a default gateway of 172.16.224.1. Host A needs to send a packet to a new host whose IP is 172.16.231.78. Host A performs the ANDing operation on its address and subnet mask. What two things will occur? (Choose two.)
• Host A will get a result of 172.16.224.0 from the AND process.
• Host A will send on to the media a broadcast frame that contains the packet.
• Host A will broadcast an ARP request for the MAC of the host 172.16.231.78.
• Host A will change the destination IP of the packet to 172.16.224.1 and forward the packet.
• Host A will encapsulate the packet in a frame with a destination MAC that is the MAC address associated with 172.16.224.1.
14. 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.
15. Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below.
• 85
• 90
• BA
• A1
• B3
• 1C
16. 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
17. Ethernet operates at which layer of the TCP/IP network model?
• application
• physical
• transport
• internet
• data link
• network access
18. 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.
19. 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.
20. 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.
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