CHAPTER 6
1. 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?
a. The
frame format is modified as it passes through each switch.
b. The
frame format remains the same across each Ethernet segment#.
c. The
frame format is modified as the media speed changed at switch B and switch E.
d. The
frame format is modified as the media material changes between copper and fiber
at switch C and switch D.
2. How many
hexadecimal digits are in a MAC address?
a. 2
b. 8
c. 12#
d. 16
e. 32
3. What are three
functions of a NIC in a PC? (Choose three.)
a. A NIC
connects the PC to the network media.#
b. A NIC
detects collisions on the Ethernet segment#.
c. A NIC
checks the formatting of data before it is transmitted.
d. A NIC
passes the contents of selected frames to the upper OSI layers.#
e. A NIC
acknowledges and retransmits data that was not received properly.
f. A NIC
discards frames when the destination IP address does not match the local host.
4. At what layer of
the OSI model does a MAC address reside?
a. 1
b. 2#
c. 3
d. 4
e. 7
5. A router has an
Ethernet, Token Ring, serial, and ISDN interface. Which interfaces will have a
MAC address?
a. serial
and ISDN interfaces
b. Ethernet
and Token Ring interfaces#
c. Ethernet
and ISDN interfaces
d. Token
Ring and serial interfaces
6. In an Ethernet
LAN, how does the NIC know when it can transmit data?
a. An
Ethernet NIC transmits data as soon as the frame is received.
b. An
Ethernet NIC transmits data as soon as the NIC receives a token.
c. An
Ethernet NIC transmits data when it senses a collision.
d. An
Ethernet NIC transmits data after listening for the absence of a signal on the
media.#
7. Which
characteristics describe carrier sense multiple access collision detect
(CSMA/CD)? (Choose three.)
a. reliable
b.
point-to-point
c.
nondeterministic#
d.
connection-oriented
e.
collision environment#
f.
first-come, first-served approach#
8. Which two devices
can provide full-duplex Ethernet connections? (Choose two.)
a. hub
b. modem
c. repeater
d. NIC#
e. Layer 2
switch#
9. 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?
a. hybrid
b. half
duplex
c. full
duplex#
d.
multilink
10. 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?
a.
autonegotiation
b. FastEthernet
c.
peer-to-peer shared resources
d.
administratively configured full duplex#
11. Refer to the
exhibit. The switch and workstation are administratively configured for
full-duplex operation. Which statement accurately reflects the operation of this
link?
a. No
collisions will occur on this link.#
b. Only one
of the devices can transmit at a time.
c. The
switch will have priority for transmitting data.
d. The
devices will default back to half duplex if excessive collisions occur.
12. 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.)
a. Hosts 1
and 4 may be operating full duplex so no collision will exist.
b. The hub
will block the port connected to Host 4 to prevent a collision.
c. After
the end of the jam signal, Hosts 1, 2, 3, and 4 invoke a backoff algorithm.#
d. When the
four hosts detect the collision, Hosts 1, 2, 3, and 4 generate a jam signal.
e. Hosts 1
and 4 are assigned shorter backoff values to provide them priority to access
the media.
f. 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.#
13. When a collision
occurs in a network using CSMA/CD, how do hosts with data to transmit respond
after the backoff period has expired?
a. The
hosts return to a listen-before-transmit mode.#
b. The
hosts creating the collision have priority to send data.
c. The
hosts creating the collision retransmit the last 16 frames.
d. The
hosts extend their delay period to allow for rapid transmission.
14. Which statement
describes how CSMA/CD on an Ethernet segment manages the retransmission of
frames after a collision occurs?
a. The
first device to detect the collision has the priority for retransmission.
b. The
device with the lowest MAC address determines the retransmission priority.
c. The
devices on the network segment hold an election for priority to retransmit data
d. The
devices transmitting when the collision occurs DO NOT have priority for
retransmission.#
15. 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?
a. CSMA/CD
b.
full-duplex#
c.
FastEthernet
d.
crossover cable
16. Why do hosts on
an Ethernet segment that experience a collision use a random delay before
attempting to transmit a frame?
a. A random
delay is used to ensure a collision-free link.
b. A random
delay value for each device is assigned by the manufacturer.
c. A
standard delay value could not be agreed upon among networking device vendors.
d. A random
delay helps prevent the stations from experiencing another collision during the
transmission.#
17. In which two
layers of the OSI model does Ethernet function? (Choose two.)
a.
application
b. session
c.
transport
d. network
e. data
link#
f.
physical#
18. Which of the
following are specified by IEEE standards as sublayers of the OSI data link
layer? (Choose two.)
a. Logical
Link Control#
b. Logical
Layer Control
c. Media
Access Control#
d. Logical
Link Communication
e. Media
Access Communication
f. Physical
Access Communication
19. Where does the
MAC address originate?
a. DHCP
server database
b.
configured by the administrator#
c. burned
into ROM on the NIC card
d. network
configuration on the computer
e. included
in the creation of the processor chip
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