CCNA 1 Chapter 09

Cisco CCNA1-Chapter-09  Correct Questions Answers 100%

1.  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.

2. Ethernet operates at which layers of the OSI model? (Choose two.)

• Network layer;
• Transport layer;
• Physical layer ;
• Application layer ;
• Session layer ;
• Data-link layer .

3. 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.

4. What three primary functions does data link layer encapsulation provide? (Choose three.)

• addressing;
• error detection;
• frame delimiting;
• port identification;
• path determination;
• IP address resolution.

5. 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.

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. What does the IEEE 802.2 standard represent in Ethernet technologies?

• MAC sublayer;
• Physical layer;
• Logical Link Control sublayer;
• Control sublayer ;
• Network layer.

8. 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;

9.  Refer to the exhibit. Which option correctly matches the frame field type with the contents that frame field includes?

• header field – preamble and stop frame;
• data field – network layer packet;
• data field – physical addressing;
• trailer field – FCS and SoF.

10. Host A has an IP address of 172.16.225.93 and a mask of 255.255.248.0. Host A needs to communicate with a new host whose IP is 172.16.231.78. Host A performs the ANDing operation on the destination address. What two things will occur? (Choose two.)

• Host A will change the destination IP to the IP of the nearest router and forward the packet;
• Host A will broadcast an ARP request for the MAC of its default gateway;
• A result of 172.16.225.0 will be obtained;
• Host A will broadcast an ARP request for the MAC of the host 172.16.231.78;
• A result of 172.16.224.0 will be obtained;
• A result of 172.16.225.255 will be obtained. (Host A wiil send on to the media a bradcast frame that contains packet).

11. 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.

12. Ethernet operates at which layer of the TCP/IP network model?

• application;
• physical;
• transport;
• internet;
• data link;
• network access.

13. 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 .

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.  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.

16. Which statements correctly describe MAC addresses? (Choose three.)

• dynamically assigne;
• copied into RAM during system startup;
• layer 3 address;
• contains a 3 byte OUI;
• 6 bytes long;
• 32 bits long.

17. 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 .

18. 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.

19. Convert the binary number 10111010 into its hexadecimal equivalent. Select the correct answer from the list below.

• 85;
• 90;
• BA ;
• A1;
• B3;
• 1C

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. 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

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