A router has an Ethernet, Token Ring,
serial, and ISDN interface. Which interfaces will have a
MAC address?
serial and ISDN
interfaces
Ethernet and Token Ring
interfaces
Ethernet and ISDN
interfaces
Token Ring and serial
interfaces
2
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?
CSMA/CD
full-duplex
FastEthernet
crossover
cable
3
Which of the following are specified by
IEEE standards as sublayers of the OSI data link layer?
(Choose two.)
Logical Link
Control
Logical Layer
Control
Media Access
Control
Logical Link
Communication
Media Access
Communication
Physical Access
Communication
4
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 checks the
formatting of data before it is transmitted.
A NIC passes the
contents of selected frames to the upper OSI
layers.
A NIC acknowledges and
retransmits data that was not received properly.
A NIC discards frames
when the destination IP address does not match the local
host.
5
In an Ethernet LAN, how does the NIC know
when it can transmit data?
An Ethernet NIC
transmits data as soon as the frame is received.
An Ethernet NIC
transmits data as soon as the NIC receives a
token.
An Ethernet NIC
transmits data when it senses a collision.
An Ethernet NIC
transmits data after listening for the absence of a
signal on the media.
6
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 is
modified as it passes through each switch.
The frame format
remains the same across each Ethernet segment.
The frame format is
modified as the media speed changed at switch B and
switch E.
The frame format is
modified as the media material changes between copper
and fiber at switch C and switch
D.
7
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.
8
Which statement describes how CSMA/CD on
an Ethernet segment manages the retransmission of frames
after a collision occurs?
The first device to
detect the collision has the priority for
retransmission.
The device with the
lowest MAC address determines the retransmission
priority.
The devices on the
network segment hold an election for priority to
retransmit data
The devices
transmitting when the collision occurs DO NOT have
priority for
retransmission.
9
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.
10
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.)
Hosts 1 and 4 may be
operating full duplex so no collision will exist.
The hub will block the
port connected to Host 4 to prevent a collision.
After the end of the
jam signal, a backoff algorithm is invoked.
Hosts 1 and 4 are
assigned shorter backoff values to provide them priority
to access the media.
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.
11
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?
hybrid
half duplex
full duplex
multilink
12
Which two devices can provide full-duplex
Ethernet connections? (Choose two.)
hub
modem
repeater
NIC
Layer 2
switch
13
Where does the MAC address
originate?
DHCP server
database
configured by the
administrator
burned into ROM on the
NIC card
network configuration
on the computer
included in the
creation of the processor
chip
14
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?
autonegotiation
FastEthernet
peer-to-peer shared
resources
administratively
configured full duplex
15
In which two layers of the OSI model does
Ethernet function? (Choose two.)
application
session
transport
network
data link
physical
16
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.
17
How many hexadecimal digits are in a MAC
address?
2
8
12
16
32
18
At what layer of the OSI model does a MAC
address reside?
1
2
3
4
7
19
Which characteristics describe carrier
sense multiple access collision detect (CSMA/CD)?
(Choose three.)
