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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