CCNA 1 Chapter 9 V4.0 Answers

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

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.

CCNA1Chapter9V4.0Answers4 thumb CCNA 1 Chapter 9 V4.0 Answers

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

 

 

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 destination host.

A result of 172.16.224.0 will be obtained.

A result of 172.16.225.255 will be obtained.

 

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.
CCNA1Chapter9V4.0Answers1 thumb CCNA 1 Chapter 9 V4.0 Answers
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.
CCNA1Chapter9V4.0Answers2 thumb CCNA 1 Chapter 9 V4.0 Answers
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 assigned

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.
CCNA1Chapter9V4.0Answers3 thumb CCNA 1 Chapter 9 V4.0 Answers
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

Pridaj komentár

Zadajte svoje údaje, alebo kliknite na ikonu pre prihlásenie:

WordPress.com Logo

Na komentovanie používate váš WordPress.com účet. Log Out / Zmeniť )

Twitter picture

Na komentovanie používate váš Twitter účet. Log Out / Zmeniť )

Facebook photo

Na komentovanie používate váš Facebook účet. Log Out / Zmeniť )

Google+ photo

Na komentovanie používate váš Google+ účet. Log Out / Zmeniť )

Connecting to %s

%d bloggers like this: