CCNA3 Chapter 2 Practice Test Questions
An Ethernet network is using CSMA/CD and a collision has occurred. Which
host will be the next to transmit data?
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The host that was the first to detect the collision.
The host that was the first to transmit data that was involved in the
collision.
A host that has data to transmit and whose backoff period expires first.
A host that has data to transmit and is holding the token at the time.
What is necessary for an Ethernet network to be free of collisions?
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The network must use fibre optic cable.
The network must use layer 2 switches.
Hubs must be replaced with switches to reduce the number of collision
domains.
The network must use full duplex transmission and be fully switched.
Which frames are flooded by a switch through all ports except the incoming
port?
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Broadcast frames, multicast frames and frames where the destination
MAC address is not in the MAC address table.
Unicast frames, multicast frames and frames where the source MAC
address is not in the MAC address table.
Broadcast frames, multicast frames and frames where there is no
known switch port that matches the source MAC address.
Broadcast frames, unicast frames and frames where there is no known
switch port that matches the destination MAC address.
Where does a switch get the data to build up its MAC address table?
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SW
From the destination MAC addresses of incoming frames.
From the source MAC addresses of incoming frames.
From the destination MAC addresses of outgoing frames.
From the source MAC addresses of outgoing frames.
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How does the default behaviour of a switch differ from the default behaviour of
a router when a broadcast message arrives?
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There is no difference. They both forward the message through all
ports except the incoming port.
There is no difference. They both drop the broadcast message.
The switch forwards the message through all ports except the incoming
port, while the router drops it.
The router forwards the message through all ports except the incoming
port, while the switch drops it.
Another name for the MAC address table of a switch is the:
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ARP table
CAM table
CAD table
CDP table
How many collision domains?
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2
3
9
10
12
And how many broadcast domains?
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SW
2
3
9
10
12
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Why are routers still required for Ethernet networks in some cases even
though multilayer switches are available that operate at layer 3?
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Routers operate more quickly than layer 3 switches.
Routers are generally better at making connections to WANs.
Switches cannot carry out routing using IP addresses.
Layer 3 switches cannot split up broadcast domains.
Which is true of port based buffering but not of shared buffering in a switch?
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Large frames can be accommodated more easily.
Frames are linked dynamically to their exit port and sent as soon as it
is available.
A frame may be delayed if the frame ahead of it in the queue is waiting
for its exit port to become available.
Buffer memory is allocated flexibly as it is required.
Which mode of switching reads the whole frame and carries out a cyclic
redundancy check?
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Fast forward
Cut through
Fragment free
Store and forward
If you type in a switch command, leave a space and then type ?, what do you
get?
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A list of other commands that can be typed in that mode.
A list of parameters that can follow the command.
An error message
A repeat of the previously typed command
If you have used the up arrow key or Ctrl + P to show several previous
commands from the command history, you can work back and show the later
commands by pressing the down arrow key or:
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Ctrl + N
Ctrl + C
Ctrl + D
Ctrl + V
Where is the running configuration held?
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SW
Flash
ROM
RAM
NVRAM
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Which command needs to be in a switch configuration in order for an
administrator to use its web based interface?
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www interface
http server enable
ip http server
ip http activate
Which command is needed if the web based interface of a switch is to be
accessed by a username and password specified in the command:
userid tech password cisco.
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ip http authentication aaa
ip http authentication enable
ip http authentication local
ip http authentication tacacs
Why is it advisable to put a switch IP address on some interface other than
VLAN 1?
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It is not possible to put an IP address on a VLAN interface.
VLAN 1 cannot be associated with a physical interface in order for
messages to be sent.
VLAN 99 is the only interface that allows access to the web based
interface.
It is more secure to use a different VLAN interface for management
purposes.
Which is the correct option for configuring a switch with the address of its local
router so that it can be accessed from a remote network?
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SW1#default-gateway 172.16.0.1 255.255.255.0
SW1(config)# default-gateway 172.16.0.1 255.255.255.0
SW1(config-if)# default-gateway 172.16.0.1 255.255.255.0
SW1(config-line)# default-gateway 172.16.0.1 255.255.255.0
You capture a running configuration that includes the line:
enable secret 5 859D23N4BA56
What will happen if you put this configuration back on a router without making
any changes in this line?
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SW
All passwords will be encrypted.
You will need to enter 859D23N4BA56 in order to reach privileged exec
mode.
The enable password must be used instead of enable secret.
The router will not accept the configuration.
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You configure both a login banner and a message of the day banner on a
switch. What do you see when you make a console connection to the switch?
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The motd banner, then the login banner, then the prompt for a
password.
The login banner, then the motd banner, then the prompt for a
password.
The motd banner, then the prompt for a password, then the login
banner.
The login banner, then the prompt for a password, then the motd
banner.
What is the effect of entering the commands:
SW1(config)#line vty 0 15
SW1(config-line)#transport input SSH
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You will not be able to Telnet to the switch.
It allows you to use SSH as well as Telnet for remote access to the
switch CLI.
All traffic received by all switch ports will be encrypted.
The switch will be able to receive SSH messages but not send them.
A port has been configured to learn a dynamic secure address. How can you
ensure that this address is still known after the switch reboots?
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Save the MAC address table.
Reconfigure the port with a static address.
Enable sticky learning then save the running configuration.
Change the security violation mode.
By default, how many secure addresses can a switch port learn?
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1
2
10
1024
Why do you give the command switchport mode access before setting
security on a port?
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SW
The command is needed in order for any device to access the port.
The default switchport mode is dynamic desirable, which does not
allow security to be configured.
The default switchport mode is trunk, which does not allow security to
be configured.
This is another way of giving the no shutdown command.
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Which type of switchport security is being configured by the command:
SW1(config-if)#switchport port-security mac-address 000c.7612.3b82
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SW
Static
Dynamic
Sticky
Protect
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