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 Module 6

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Registration date : 2007-02-22

PostSubject: Module 6   Tue Nov 13, 2007 11:10 am

CCNA 1
Chapter 6
=========================
Use this at your own risk.
I'm not responsible for
what you do with it.
Happy cheating ^^
=========================


===========================================================================
Refer to the exhibit. Host A is communicating with host F. What happens to a frame sent from
host A to host F as it travels over the Ethernet segments?

*The frame format remains the same across each Ethernet segment.
===========================================================================
How many hexadecimal digits are in a MAC address?

*12
===========================================================================
What are three functions of a NIC in a PC? (Choose three.)

*A NIC connects the PC to the network media.
*A NIC detects collisions on the Ethernet segment.
*A NIC passes the contents of selected frames to the upper OSI layers.
===========================================================================
At what layer of the OSI model does a MAC address reside?

*2
===========================================================================
A router has an Ethernet, Token Ring, serial, and ISDN interface. Which interfaces will have
a MAC address?

*Ethernet and Token Ring interfaces
===========================================================================
In an Ethernet LAN, how does the NIC know when it can transmit data?

*An Ethernet NIC transmits data after listening for the absence of a signal on the
media.
===========================================================================
Which characteristics describe carrier sense multiple access collision detect (CSMA/CD)?
(Choose three.)

*nondeterministic
*collision environment
*first-come, first-served approach
===========================================================================
Which two devices can provide full-duplex Ethernet connections? (Choose two.)

*NIC
*Layer 2 switch
===========================================================================
On a local area network, one workstation can send data on the line while it is receiving
data. What type of data transfer does this describe?

*full duplex
===========================================================================
Refer to the exhibit. The small office network shown in the exhibit consists of four
computers connected through a hub. Which configuration would cause collisions and errors on
the network?

*administratively configured full duplex
===========================================================================
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.
===========================================================================
Refer to the exhibit. All hosts are in listen mode. Host 1 and Host 4 both transmit data at
the same time. How do the hosts respond on the network? (Choose two.)

*After the end of the jam signal, Hosts 1, 2, 3, and 4 invoke a backoff algorithm.
*If a host has data to transmit after the backoff period of that host, the host
checks to determine if the line is idle, before transmitting.
===========================================================================
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.
===========================================================================
Which statement describes how CSMA/CD on an Ethernet segment manages the retransmission of
frames after a collision occurs?

*The devices transmitting when the collision occurs DO NOT have priority for
retransmission.
===========================================================================
Refer to the exhibit. A technician wants to increase the available bandwidth for the
workstation by allowing the switch and the NIC on the workstation to transmit and receive
simultaneously. What will permit this?

*full-duplex
===========================================================================
Why do hosts on an Ethernet segment that experience a collision use a random delay before
attempting to transmit a frame?

*A random delay helps prevent the stations from experiencing another collision
during the transmission.
===========================================================================
In which two layers of the OSI model does Ethernet function? (Choose two.)

*data link
*physical
===========================================================================
Which of the following are specified by IEEE standards as sublayers of the OSI data link
layer? (Choose two.)

*Logical Link Control
*Media Access Control
===========================================================================
Where does the MAC address originate?

*burned into ROM on the NIC card
===========================================================================
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