Cisco CCNA exploration v 4.0, module 1, chapter 9 Exam.
Questions and answers 100% correct.
| 1. | 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 | ||
| 2. | 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 | ||
| 3. | Ethernet operates at which layer of the TCP/IP network model? | |
| application | ||
| physical | ||
| transport | ||
| internet | ||
| data link | ||
|
network access | |
| 4. | 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 | |
| 5. | 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 | ||
| 6. | 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. | ||
| 7. | What three primary functions does data link layer encapsulation provide? (Choose three.) | |
|
addressing | |
|
error detection | |
|
frame delimiting | |
| port identification | ||
| path determination | ||
| IP address resolution | ||
| 8. | 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 | ||
| 9. | 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. | ||
| 10. | What are the two dynamic methods used to maintain ARP tables? (Choose two.) | |
|
monitor traffic on the local segment | |
| monitor traffic on the local and remote segments | ||
|
send a Layer 2 broadcast containing an ARP request | |
| send a Layer 3 broadcast containing an ARP request | ||
| 11. | Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below. | |
| 85 | ||
| 90 | ||
|
BA | |
| A1 | ||
| B3 | ||
| 1C | ||
| 12. |  Refer to the exhibit. What command was executed on a host computer to produce the results shown? |
|
| route PRINT | ||
|
arp -a | |
| arp -d | ||
| netstat | ||
| telnet | ||
| 13. | What are the two basic functions of the ARP protocol? (Choose two.) | |
| resolve known IPv6 addresses to MAC addresses | ||
| resolve known MAC to IP addresses | ||
|
maintain ARP cache in RAM | |
|
resolve known IPv4 addresses to MAC addresses | |
| 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. | 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. | |
| 16. | 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 | ||
| 17. | Ethernet operates at which layers of the OSI model? (Choose two.) | |
| Network layer | ||
| Transport layer | ||
|
Physical layer | |
| Application layer | ||
| Session layer | ||
|
Data-link layer | |
| 18. |
|
|
| 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. |  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. | |
| 20. | 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 | ||
| 21. | 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. | ||
| 22. | What does the IEEE 802.2 standard represent in Ethernet technologies? | |
| MAC sublayer | ||
| Physical layer | ||
|
Logical Link Control sublayer | |
| Network layer | ||
| 23. | 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 | ||
