CompTIA Network+ Certification Study Guide part 70 pdf

Appendix C
676
Correct answer and explanation: D. Layer 5 switch. Layer 5 switches
use information from the session layer, allowing it to route packets using
Uniform Resource Locators (URLs).
Incorrect answers and explanations: A, B, and C. Answer A is incorrect
because an external transceiver is an external device, and thereby isn’t built
onto the NIC. Answers C and D are incorrect because neither of these are
types of transceivers. They are connectors used for connecting coaxial cable.
You are looking into purchasing a new switch for your network. You 5.
want the switch to be able to route packets of data based on the
uniform resource locator included with the packet. Which switch
type should you buy?
A. Layer 2 switch
B. Layer 3 switch
C. Layer 4 switch
D. Layer 5 switch
Correct answer and explanation: D. Layer 5 switch. Layer 5 switches
use information from the session layer, allowing it to route packets using
Uniform Resource Locators (URLs).
Incorrect answers and explanations: A, B, and C. Answer A is incorrect
because Layer 2 switches work at the data link layer and look at the MAC
address of the packet to determine where it is to be sent. Answer B is incor-
rect because Layer 3 switches work at the network layer of the OSI model
and have an integrated router function that allows it to make decisions
as to where the data should be sent. Answer D is incorrect because Layer
4 switches use information in the packet that identifies the application it
belongs to so that priorities can be set in routing the packets to the destina-
tion computer.
You have installed new cabling to accommodate a new section of 6.
the building that is being networked. Once computers are installed,

you find that they are unable to connect to the network. You
believe the problem is that the length of the cabling has exceeded
the maximum distance allowed. You want to fix the problem with
the least amount of cost and work. Which of the following will you
do?
A. Remove the cabling and install cable that supports a longer
distance.
B. Install a passive hub to increase the distance that data can travel
along the cable.
Appendix C 677
C. Install a NIC to increase the distance that data can travel along
the cable.
D. Install a switch to increase the distance that data can travel
along the cable.
Correct answer and explanation: D. Install a switch to increase the dis-
tance that data can travel along the cable. Switches can perform the same
functions that repeaters used to by regenerating the data so that it is sent out
from the switch at its original strength.
Incorrect answers and explanations: A, B, and C. Answer A is incorrect
because removing the cabling and replacing it with another kind is not only
costly but a considerable amount of work. Answer B is incorrect because
a passive hub won’t regenerate the data when it is sent out from its ports.
Answer C is incorrect because a NIC is used as an interface to communicate
on the network. It isn’t used as a means of regenerating data so that the
network can be extended.
What will happen if we have a routing table with the same route to 7.
the same destination network?
A. You cannot have the same route listed twice.
B. You cannot have the same destination listed twice.
C. The route with the closest router will be used.

D. The route with the fewest number of hops will be used.
Correct answer and explanation: D. The route with the fewest number of
hops will be used. If a route claims, it can reach the destination in one fewer
hop than another router, then that route will be used.
Incorrect answers and explanations: A, B, and C. Answer A is incorrect
because fault tolerant routes are a main advantage of routers if one route is
unavailable. Answer B is incorrect for the same reason. Answer C is incor-
rect because the cable distances aren’t taken into account, only the number
of hops.
What will happen if the default gateway is not specified on your 8.
computer and you are trying to reach another network?
A. The packet will ask every router if they know the path to reach
the destination.
B. The packet will broadcast for the IP address of the nearest
router.
C. The packet will be forwarded to the DNS server.
D. The packet will not be sent.
Appendix C
678
Correct answer and explanation: D. The packet will not be sent. Without that
default gateway, you are stuck on the local network. The subnet mask, which
you will learn about in the next chapter, is also very important. Without a prop-
erly configured subnet mask to determine which subnet your computer is on,
your computer will be unable to communicate outside of the local network.
Incorrect answers and explanations: A, B, and C. Answer A is incorrect
because the PC will not know the addresses of the routers to send the data pack-
ets to or even inquire about router addresses or destination addresses. Answer B
is incorrect for the same reason. Answer C is incorrect because the DNS server
is used for name-to-IP address resolution and not IP addresses of routers.
You need to connect two networks that work on two different 9.

network protocols. Which of the following should be used?
A. DMZ
B. Firewall
C. Gateway
D. NAS
Correct answer and explanation: C. Gateway. If two networks work on
different communication systems, they will not be able to talk to each other.
A gateway functions as a translator between two dissimilar networks so that
both are able to communicate. For example, if your Ethernet network is to be
connected to a Token Ring network, you will need to have a gateway so that
hosts in the two networks are able to communicate.
Incorrect answers and explanations: A, B, and D. Answer A is incorrect
because a DMZ is a neutral network segment where systems accessible to
the public Internet are housed, which offers some basic levels of protection
against attacks. Answer B is incorrect because a firewall provides protection
by filtering traffic from the external network to the internal network, and
vice versa. Answer D is incorrect because a NAS is a system of devices that
are dedicated to providing storage of data on the network.
You have replaced all the hubs in your network with 10/100 Mbps 10.
switches. The switch ports are configured to work by automatically
sensing the network speed. Most of the workstations already had
10/100 Mbps network adapters. Which of the following will you
need to do to upgrade the speed of the entire network to 100 Mbps?
A. Replace all 10 Mbps network adapters to 10/100 Mbps in the
remaining workstations.
B. Reconfigure all the ports on the switch to operate only at 100 Mbps.
Appendix C 679
C. Reconfigure the 10 Mbps adapters in remaining workstations to
operate only at 100 Mbps.
D. None of the above.

Correct answer and explanation: A. Replace all 10 Mbps network adapt-
ers to 10/100 Mbps in the remaining workstations. Because the switch
ports are configured to automatically sense the network speed, the work-
stations with 100 Mbps network adapters will communicate with the
switch at 100 Mbps and others at 10 Mbps. This will affect the overall
network speed. To have a complete 100 Mbps network, you should replace
the 10 Mbps adapters with 10/100 Mbps network adapters in the remain-
ing workstations.
Incorrect answers and explanations: B, C, and D. Answer B is incorrect
because even if the switch ports are configured to operate at 100 Mbps,
the communication with workstations with 10 Mbps adapters will be at
10 Mbps. Answer C is incorrect because 10 Mbps adapters cannot be con-
figured to operate at 100 Mbps. Answer D is incorrect because answer A is
a legitimate solution.
As a network technician, you are asked to deploy a network load 11.
balancer. You need to configure a network load balancer on the
10.0.10.0/8 network for the Web development group. You need to
configure it appropriately. From the list of possible deployment
scenarios, which would you select from as your design?
A. You need to distribute the load to a group of SSH servers.
B. You need to centralize your traffic around your FTP servers.
C. You need to distribute the load to a pool of Web servers.
D. You need to redistribute the traffic to a farm of DHCP servers on
your DMZ.
Correct answer and explanation: C. Load balancers are primarily used
when working with Web servers. Although load balancers can be used in
other situations, you would likely not see them used in the other options and
solutions provided for you.
Incorrect answers and explanations: A, B, and D. Answer A is incorrect
because you would not use a load balancer in that fashion nor would SSH be

used in this way. Answer B is incorrect because FTP servers are not in need
of load balancing. Answer D is incorrect because you would not use a load
balancer to balance DHCP requests.
Appendix C
680
When using a multilayer switch, which layer are you likely 12.
working on?
A. Network
B. Application
C. Presentation
D. Session
Correct answer and explanation: A. A multilayer switch operates on the
first three layers of the OSI model. Primarily, on Layers 2 and 3 because the
multifunction device maintains a list of MAC addresses in its CAM table
as well as a routing table in memory. The device can send packets along a
routed network just as easily as switching data on a Layer 2 network.
Incorrect answers and explanations: B, C, and D. Answer B is incorrect
because multilayer switches primarily operate on the first few layers of the
OSI model, not the topmost layers. Answer C is incorrect because multilayer
switches primarily operate on the first few layers of the OSI model, not the
topmost layers. Answer D is incorrect because multilayer switches primarily
operate on the first few layers of the OSI model, not the topmost layers.
A workstation in building A of an office campus network needs to 13.
obtain IP configuration information from a DHCP server in build-
ing B of the same campus. What is needed to accomplish this if the
packets must traverse a router or a filtering device?
A. DNS relay
B. DHCP relay
C. WINS relay
D. Packet Sniffer

Correct answer and explanation: B. Answer B is correct because you need
a DHCP relay agent configured on a router or any device configured to filter
(and drop) a broadcast typically sent by a DHCP client to a DHCP server.
You are the administrator of a small business network. You notice 14.
that as you add workstations to the network over time the speed
of the network decreases, what devices would you replace in your
network with what other device to resolve this problem?
A. Replace repeaters with hubs.
B. Replace routers with hubs.
C. Replace routers with switches.
D. Replace hubs with switches.
Appendix C 681
Correct answer: D.
As a network administrator you need to deploy a VOIP phone. You 15.
are unfamiliar with this technology. Which connection type could
you use on a standard IP phone?
A. RJ-12
B. RJ-13
C. RJ-24
D. RJ-45
Correct answer: D.
ChApTEr 4: SwITChING
You have purchased a basic switch for your network that can look 1.
at information within a packet of data and send it to its destina-
tion address. It has no additional features. What kind of switch is
this?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5

Correct answer and explanation: A, Layer 2. This scenario describes a basic
Layer 2 switch, which looks at the packet to determine the MAC address
of the computer where the packet is being sent. The MAC address makes
the computer identifiable on a network and allows the switch to determine
which computer the data is meant for.
Incorrect answers and explanations: B is incorrect because a Layer 3 switch
has the capabilities of a router. A Layer 3 switch uses switching tables and
switching algorithms to determine how to send data via MAC addressing
from host to host, device to device. C is incorrect because Layer 4 switches
work at the transport layer of the OSI model and have the added feature
of being able to look at the application protocols being used to send data.
D is incorrect because a Layer 5 switch works at the session layer of the OSI
model and looks at the information in a packet provided by this layer for
routing. This information includes such information as Uniform Resource
Locators (URLs) that allow the switch to route the packet more effectively to
a destination computer. An URL is a method of addressing that is commonly
used on the Internet.
Appendix C
682
A broadcast message is sent by a computer onto the network. 2.
Which of the following will occur when the switch receives the
broadcast message?
A. The message will be sent to all computers on the network.
B. The message will be sent to all computers in the same broadcast
domain.
C. The message will not be sent because switches will only send
messages between two nodes.
D. The message will not be sent because switches are designed to
always ignore broadcast messages.
Correct answer and explanation: B. The message will be sent to all com-

puters in the same broadcast domain. A broadcast domain is a logical seg-
ment of the network. Computers that are a part of the same domain can
broadcast messages to all the computers in the same domain.
Incorrect answers and explanations: A is incorrect because only the com-
puters in the broadcast domain will receive the message. C is incorrect
because although switches will establish a connection between two comput-
ers by passing a message from one port to another, broadcast messages are
sent to all the computers within the same broadcast domain. D is incorrect
because switches can pass a broadcast message to all computers within a
broadcast domain.
You are looking into purchasing a new switch for your network. You 3.
want the switch to be able to route packets of data based on the
uniform resource locator included with the packet. Which switch
type should you buy?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5
Correct answer and explanation: D, Layer 5 switch. This type of switch
works at the session layer of the OSI model, and looks at the information in
a packet provided by this layer for routing. This information includes such
information as Uniform Resource Locators (URLs) that allow the switch
to route the packet more effectively to a destination computer. A URL is a
method of addressing that is commonly used on the Internet.
Incorrect answers and explanations: A is incorrect because a Layer 2 switch
looks at the packet to determine the MAC address of the computer where
Appendix C 683
the packet is being sent. The MAC address makes the computer identifiable
on a network and allows the switch to determine which computer the data
is meant for. B is incorrect because a Layer 3 switch has the capabilities of a

router. A Layer 3 switch uses switching tables and switching algorithms to
determine how to send data via MAC addressing from host to host, device to
device. C is incorrect because Layer 4 switches work at the transport layer of
the OSI model and have the added feature of being able to look at the appli-
cation protocols being used to send data.
A switch on your network is designed to look at the MAC address 4.
of incoming data, and then use switching tables and algorithms to
properly route data to its intended destination. What type of switch
is being used?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5
Correct answer and explanation: B. A Layer 3 switch has the capabilities
of a router. A Layer 3 switch works by using switching tables and switching
algorithms to determine how to send data via MAC addressing from host to
host, device to device.
Incorrect answers and explanations: A is incorrect because a Layer 2 switch
looks at the packet to determine the MAC address of the computer where
the packet is being sent. The MAC address makes the computer identifiable
on a network and allows the switch to determine which computer the data
is meant for. C is incorrect because Layer 4 switches work at the transport
layer of the OSI model and have the added feature of being able to look at
the application protocols being used to send data. D is incorrect. Although a
Layer 5 switch looks at the information in a packet for routing, it uses such
information as Uniform Resource Locators (URLs) that allow the switch
to route the packet more effectively to a destination computer. A URL is a
method of addressing that is commonly used on the Internet.
Your company has just purchased a smaller rival business and now 5.
wants you to connect the two networks together. Your company’s

existing network is twice the size of the new network. To get these
two networks connected together, which of the following will you do?
A. Install a VLAN to connect the two networks together.
B. Install a switch to connect to the two networks together.
Appendix C
684
C. Install a bridge to break the larger LAN into two smaller ones,
and then connect these to the other LAN using a switch.
D. Install a switch to break the larger LAN into two smaller ones,
and then connect these to the other LAN using a switch.
Correct answer and explanation: B. Install a switch to connect to the two net-
works together. Switches are also called multiport bridges, as it can provide the
same functionality as a bridge, which is used to connect two LANs together.
Incorrect answers and explanations: A is incorrect because a VLAN is a
virtual LAN and wouldn’t be used to connect the two networks together. C
and D are incorrect because there is no need to segment the existing LAN
before connecting it to the new smaller LAN.
A small network consists of three computers named Alpha, Beta, 6.
and Omega. Alpha sends a message to Omega, and the data is
passed through a switch. When it reaches the hub, which of the
following will occur?
A. The message is broadcast to all the computers on the network.
B. The message is sent out on all the ports. Beta will ignore the
message because it isn’t intended for that computer.
C. The message will only be sent out on the port connecting to Beta.
D. The message will only be sent out on the port connecting to
Omega.
Correct answer and explanation: D. The message will only be sent out on
the port connecting to Omega. When the computer named Alpha sends the
data to the switch, the switch will then send out the data across the port that

connects to its destination, which is the computer named Omega.
Incorrect answers and explanations: A is incorrect because the message is
being sent to Omega and isn’t a broadcast message. B is incorrect because a hub
will send out the data on all ports, whereas a switch will only send out the data
to the port that connects to the destination computer. C is incorrect because
the message is intended for the computer named Omega not Beta. Therefore,
the choice is saying that the data is being sent out over the wrong port.
You are the network administrator of a large company that has 7.
experienced several hacking attempts in the past. You decide to
install a new IDS on your network. Which of the following will be
required so that the IDS can view data going across a switch?
A. Port authentication
B. Port mirroring
Appendix C 685
C. VLAN
D. Trunking
Correct answer and explanation: B. Port mirroring is used to allow all the
data sent and received on one port or VLAN to be copied to another port. In
doing so, a mirror image of the data can be sent to the Intrusion Detection
System so that the network traffic can be analyzed.
Incorrect answers and explanations: A is incorrect because port authentica-
tion requires a client authenticating to a server before it is given access to a
port. C is incorrect because a VLAN is a virtual LAN, which is used to make
computers in different locations appear to be part of the same local area net-
work. In doing so, broadcast messages can be sent to all computers and devices
that are part of the same VLAN because they are part of the same broadcast
domain. D is incorrect because trunking is used to allow two or more VLANs
to communicate with one another across a single network link.
Your company is looking at replacing all the standard telephones 8.
used in its offices with IP telephones. The initial analysis shows

that there would be a cost savings to the company using IP tele-
phones, but there is a concern that there would be a high initial
cost of having to install new electrical outlets to power these devic-
es. Which of the following could be used to power the IP telephones
without needing to install additional power outlets?
A. PoE
B. STP
C. Trunking
D. VLAN
Correct answer and explanation: A. PoE is Power over Ethernet, which is
a technology in which power can be transferred over standard twisted-pair
cables without modification to the existing cabling infrastructure. The sce-
nario states that the company is seeking to use IP telephones, which would
be a suitable use for PoE.
Incorrect answers and explanations: B is incorrect because STP is Spanning
Tree Protocol, which was designed to prevent broadcast storms that result
from looping. C is incorrect because a VLAN is a virtual LAN and used so
that broadcast messages can be sent to all computers and devices that are
part of the same VLAN because they are part of the same broadcast domain.
D is incorrect because trunking is used to allow two or more VLANs to com-
municate with one another across a single network link.