Answer A is incorrect because the rate is 64 Kbps, not 56 Mbps?. Answer C is incorrect because the rate is 64 Kbps, not 256 Mbps.. An acceptable rule of thumb is that WIMAX will sustai
Trang 1You have been asked to set up a routed network within your
15
company Your company routers are homogenous, having stan-dardized on Cisco You want to set up the best routing solution within your company for this equipment What routing protocol would you use?
A RIP
B OSPF
C IS-IS
D EIGRP
Correct answer and explanation: D Cisco has a proprietary routing
pro-tocol called EIGRP, which they believe is the best Cisco would recommend
that you use this routing protocol
Incorrect answers and explanations: A, B, and D Answer A is incorrect;
though RIP is a standard, it does not have as many factors in path
deter-mination as EIGRP Answer B is incorrect; OSPF has many factors used in
path determination but is not preferred over EIGRP with Cisco equipment
Answer C is incorrect; IS–IS would be a good choice, but is not preferred over
EIGRP on Cisco equipment
You have a DHCP server that is configured to have only 10 addresses
16
available in the pool of addresses to be handed out When a colleague tries to lease an IP address, he is unable to do so In viewing the log, you see the following packets relating to his attempt to get an address DHCPDiscover, DHCPOffer, DHCPRequest, DHCPNack What might be the potential cause of the issue?
A The DHCP server is not running
B The DHCP server handed out an IP address to your colleague
C The DHCP server was unable to hand out an IP address to his system
D The DHCP server is really a BootP server
Correct answer and explanation: C The DHCP communicated with the
client but was unable to provide an IP address indicated by the DHCPNack packet
Incorrect answers and explanations: A, B, and D Answer A is
incor-rect The server is running because the server did send DHCPOffer and
DHCPNack packets Answer B is incorrect The DHCPNack packet
indi-cates that the server could not provide an IP address to your colleague
Answer D is incorrect DHCP is just an enhanced version of the original
BootP protocol
Trang 2ChApTEr 8: wIdE ArEA NETworKING
As the primary lead on your company’s helpdesk, you are asked
1
to help resolve a problem call with an ISDN line A customer
wants to upgrade an existing ISDN line because it’s currently too
slow Right now, he is using a single BRI ISDN circuit-switched
B channel From the available choices, what should his
transmis-sion rate be?
A 56 Mbps
B 64 Kbps
C 128 Kbps
D 256 Mbps
Correct answer and explanation: C When working with ISDN technology,
always remember that the transmission rate of a single BRI ISDN B channel
is 64 Kbps
Incorrect answers and explanations: A, B, and D Answer A is incorrect
because the rate is 64 Kbps, not 56 Mbps
Answer B is incorrect because the rate is 64 Kbps, not 128 Kbps Answer C
is incorrect because the rate is 64 Kbps, not 256 Mbps
As the network administrator for your company, you are asked by
2
your CIO to design and deploy a data link between two offices of
your company There are 10 employees located in each office Your
main concerns are the speed of the connections, the reliability
of transferring of data, and the cost Which solution should you
implement? (Choose one.)
A Place a modem on a server in each office so they can connect
B Connect an ISDN circuit to each workstation in both locations
C Use an ISDN circuit connected to a dedicated location or server
in each building
D Have each workstation at both locations use a modem to
con-nect to opposite offices
Correct answer and explanation: C ISDN provides better speed,
connec-tion time, and reliability than a modem ISDN can be connected to systems
in many ways because of the different adapters that can be used with it
ISDN circuits will be terminated on a device or within a location, not on a
modem, or on individual workstations using modems
Trang 3Incorrect answers and explanations: A, B, and D Answer A is incorrect
because ISDN circuits will be terminated on a device or within a location,
not on a modem, or on individual workstations using modems Answer B is incorrect because ISDN circuits do not terminate on workstations Answer D
is incorrect because ISDN circuits will be terminated on a device or within a location, not on a modem, or on individual workstations using modems
You are the IT manager for rsnetworks.net As the person
respon-3
sible for recommending the right technology, what would you select
as the solution to provide the fastest connectivity? (Select one.)
A T3
B T1
C ISDN BRI
D Cable Modem
Correct answer and explanation: A The T3 provides the fastest
connectiv-ity T3s provide access up to 45 Mbps
Incorrect answers and explanations: B, C, and D Answer B is incorrect
because a T1 provides up to 1.544 Mbps
Answer C is incorrect because ISDN BRI provides up to 128 Kbps Answer D is incorrect because a cable modem network is generally up to
10 Mbps
You want to connect a remote office to a corporate network The
4
only available service is an analog dial-up line provided by the local telephone company What device would you need to implement to use this analog dial-up solution?
A CSU/DSU
B ISDN adapter
C Modem
D NIC
Correct answer and explanation: C A modem is used to connect to the
Internet using the local telephone company’s telephone lines
Incorrect answers and explanations: A, B, and D Answer A is
incor-rect because a CSU/DSU is a multiplexer generally used with T1 access
Answer B is incorrect because an ISDN adapter is used for digital service, not analog Answer D is incorrect because a NIC is used for connecting a
system to a local area network
As the Network Manager for rsnetworks.net, you need to
imple-5
ment a solution that will allow for sporadic connection to the
Trang 4Internet Your only requirement is that you find a solution that will
provide a connection of up to 128 Kbps to the Internet, only when
needed Which solution should you implement?
A T1
B T3
C 56 Kbps
D BRI ISDN
Correct answer and explanation: D BRI ISDN provides up to 128 Kbps.
Incorrect answers and explanations: A, B, and C Answer A is incorrect
because a T1 is a dedicated connection, it’s always on, and you always pay
for its use It’s also 1.544 Mbps Answer B is incorrect because a T3, much
like a T1, is a dedicated connection providing up to 45 Mbps Answer C is
incorrect because a 56 Kbps leased line will only provide up to 56 Kbps
As a network manager for your company’s high-speed network,
6
you are looking to implement a new line from a remote site
(Chicago) to the company’s core hub (New York) where the
main-frame is located The mainmain-frame is where all the company’s sales
orders are placed daily The hub site is where all sites get their
Internet access and where they upload and download files
Con-nection to this mainframe 24 hours a day is essential to meeting
the business plan You have just heard from your systems engineer
that users are no longer able to access the mainframe from the
remote sites; the users at the core site are still able to access the
mainframe
Within minutes, the connection is restored and all users are able to access
the mainframe once more From careful analysis, you uncover that during
the time that the remote users were not able to access the mainframe, one
user had been downloading a very large file from the Internet to the remote
site user’s PC You find that the user was downloading a legitimate file and
will be doing so each day You cannot afford this type of network slowdown
each day, so you decide to allow for the upgrading of the line It’s currently
at 128 Kbps using ISDN BRI You have found that after careful analysis of
the remote sites’ usage patterns and looking over the documentation of the
current network, an upgrade of approximately 1.5 Mbps is needed across all
links Which technology would you implement? (Choose one.)
A ADSL
B E1
C LAN adapter
D T1
Trang 5Correct answer and explanation: D T1.
Incorrect answers and explanations: A, B, and C Answer A is incorrect
because ADSL is not good for uploading, just for downloading, and it is not fast
enough to meet the required needs Answer B is incorrect because an E1 doesn’t
even apply; this technology is European based and the company is located in
the United States Answer C is incorrect because a LAN adapter, which can
deliver amazing speeds, is a LAN-based technology, not a WAN-based technol-ogy, which is what is used to connect the remote sites to the core
The PSTN is the analog-based telephone system we have come to
7
learn to be very familiar with today What are some of the features
of PSTN? (Choose all that apply.)
A Compared to DSL and ISDN, it is inexpensive
B Worldwide installation base in use and readily available
C Easy to use and configure
D Transfer rates of 64 Kbps
Correct answers and explanations: A, B, and C Answers A, B, and C are
all correct because the PSTN is a readily available, easy to use, and is a rela-tively inexpensive method to dial up to an ISP and connect to the Internet
Incorrect answer and explanation: D Answer D is incorrect because the
PSTN has a transfer rate of 56 Kbps, whereas the answer specified 64 Kbps
You are a network administrator at your company Your company
8
has a number of sales and marketing users who work remotely and telecommute from home or from sales meetings These users dial into a remote access service (RAS) server to access the corporate headquarters One day, one of the sales users dials up the RAS server to connect to the corporate headquarters network to access
a few files The sales user dials up the RAS server and cannot connect The sales user when asked reports that there is no dial tone What is the cause of the problem? (Choose one.)
A Telephone company problem
B The modem does not support the PC
C The modem settings are set incorrectly
D There are no settings configured within Windows
Correct answer and explanation: A If there is no dial tone on the line; you
will not be able to dial out to the RAS server to connect to your corporate network For the network+ exam, you will be expected to troubleshoot many scenarios, so make sure you read them very carefully
Trang 6Incorrect answers and explanations: B, C, and D Answer B is incorrect
because neither the modem nor the PC is the problem; the problem is with
the carrier There is no dial tone; therefore, you will not be able to dial out
Answer C is incorrect because the modem settings are not the root cause of
the problem Answer D is incorrect because the Windows Operating system
is installed on a PC, which has nothing to do with the absence of dial tone
You are the network technician at your company You are
configur-9
ing a Windows NT 4.0 laptop for dial-up networking The laptop
will be used by a telecommuter The telecommuter will use the
laptop to dial into a Microsoft Windows NT 4.0 RAS server Once
connected, the telecommuter will need access to a UNIX machine
What should you install on the laptop? (Choose two.)
A TCP/IP Protocol
B RDP
C VPN
D Dial-up networking
Correct answers and explanations: A and D You will need to have dial-up
networking and the TCP/IP protocol installed on your Windows system to
dial into a Windows NY 4.0 RAS server
Incorrect answers and explanations: B and C Answer B is incorrect
because RDP (Remote Desktop Protocol) is not needed for connectivity to a
RAS server RDP is used to make connections to remote hosts Answer C is
incorrect because a VPN is a secure network created over an insecure one
(namely the Internet)
You are a consultant looking over network documentation for a
10
small company with one core site and two remote sites Router A
shows the location of the corporate headquarters where there is also
a link out for Internet access and another remote site configured to
also connect to the core From Figure 8.8, what type of WAN
tech-nology is in use based on the information shown for Link A?
A DSL
B T3
C T1
D FDDI
Correct answer and explanation: C Based on the information given, it is
clear that a T1 is in use
Incorrect answers and explanations: A, B, and D Answer A is incorrect
because DSL does not operate in a point-to-point fashion, nor does it operate
Trang 7at the speed shown in the illustration Answer B is incorrect because a T3 operates at 45 Mbps, not 1.544 Answer D is incorrect because a cable
net-work is a shared netnet-work that supports speed up to 10 Mbps
FIGurE 8.8 WAN Technology.
You are the network manager and you just sat down for lunch at your
11
desk You notice that you have to troubleshoot a circuit switching network from a note written by your boss Your boss has also placed
a picture of this circuit-switched network on your desk What is the usual WAN technology associated with circuit-switched networks?
A Internet Services Digital Network
B Integrated Services Digital Netware
C Integrated Services Diagram Network
D Integrated Services Digital Network
Correct answer and explanation: D Integrated Services Digital Network
(ISDN) The switched circuit is initiated with the circuit number of the remote network In the case of ISDN, the setup will use a SPID (service pro-vider ID) number, which is essentially a phone number that the router dials
to initiate the circuit with the WAN switch
Incorrect answers and explanations: A, B, and C A Internet Services
Digital Network, Integrated Services Digital Netware, and Integrated Services Diagram Network are all incorrect acronyms of ISDN
What is the difference between ISDN and dial-up?
12
A Both use dialing, but dial-up is based on the WAN and uses ana-log lines, whereas ISDN (and DSL) are both digital
Trang 8B Neither use dialing, but dial-up is based on the telephone system
and uses analog lines, whereas ISDN (and DSL) are both analog
C Both use dialing, but dial-up is based on the telephone system
and uses digital lines, whereas ISDN (and DSL) are both digital
D Both use dialing, but dial-up is based on the telephone system
and uses analog lines, whereas ISDN (and DSL) are both digital
Correct answer and explanation: D Both use dialing, but dial-up is based
on the telephone system and uses analog lines, whereas ISDN (and DSL) are
both digital
Incorrect answers and explanations: A, B, and C A Dial-up is NOT based
on the WAN but rather telephone systems B Both use dialing and ISDN
(and DSL) are both digital C Dial-up is based on the telephone system and
use analog lines
You just got hired on to a Mobile Telecommunication Cellular
13
company and your first assignment is to teach your junior network
engineers what WIMAX is What description best describes what
WIMAX is and stands for?
A WIMAX stands for WWW Interoperability for Microwave
Access It is based on IEEE 802.16 standards or Broadband
Wire-less Access An acceptable rule of thumb is that WIMAX will
sustain 70 Mbps transmission rates at approximately 15 miles
B WIMAX stands for Worldwide Interoperability for Microwave
Access It is based on IEEE 802.11 standards or Broadband
Wire-less Access An acceptable rule of thumb is that WIMAX will
sustain 70 Mbps transmission rates at approximately 30 miles
C WIMAX stands for Worldwide Internet for Microwave Access
It is based on IEEE 802.16 standards, or Broadband Wireless
Access An acceptable rule of thumb is that WIMAX will sustain
70 Mbps transmission rates at approximately 15 miles
D WIMAX stands for Worldwide Interoperability for Microwave
Access It is based on IEEE 802.16 standards, or Broadband
Wire-less Access An acceptable rule of thumb is that WIMAX will
sustain 70 Mbps transmission rates at approximately 30 miles
Correct answer and explanation: D WIMAX stands for Worldwide
Interoperability for Microwave Access It is based on IEEE 802.16 standards
or Broadband Wireless Access An acceptable rule of thumb is that WIMAX
will sustain 70 Mbps transmission rates at approximately 30 miles
Incorrect answers and explanations: A WIMAX does not stand for WWW
Interoperability for Microwave Access WIMAX will sustain 70 Mbps
Trang 9transmission rates at approximately 30 miles not 15 miles B WIMAX is based on IEEE 802.16 standards not 802.11 C WIMAX does not stand for
Worldwide Internet for Microwave Access WIMAX will sustain 70 Mbps transmission rates at approximately 30 miles, not 15 miles
What is Figure 8.9 depicting? Choose the best answer
14
A WIMAX similar network
B Satellite-based network
C Wireless Wide Area Network
D Wide Area Network technology
Correct answers and explanations: B and D B Satellite-based network
is depicted in Figure 8.24 D Wide Area Network technology is how
sat-ellite-based networks are categorized; therefore, this is also a depiction of
a wide area network technology A and C A An acceptable rule of thumb
is that WIMAX will sustain 70 Mbps transmission rates at approximately
30 miles C Wireless Wide Area Networks (WWAN) are network
traf-fic encapsulated in mobile communications technology such as WIMAX, UMTS, CDMA2000, or 3G networks to name just a few
How far do LEOs and MEOs orbit above the earth?
15
A LEOs 1,800 to 2,000 miles; MEOs 1,800 to 2,000 miles
B LEOs 1,800 to 2,000 miles; MEOs 2,000 to 10,000 miles
C LEOs 1,800 to 2,000 miles; MEOs 9,000 to 10,000 miles
D LEOs 9,000 to 10,000 miles; MEOs 9,000 to 10,000 miles
FIGurE 8.9
Trang 10Correct answer and explanation: C LEOs are primarily used with
Internet-based satellite communications and are typically located approximately
1,800 to 2,000 miles above Earth MEOs orbit at approximately 9,000 to
10,000 miles above Earth
Incorrect answers and explanations: A, B, and D A LEOs and MEOs do
not orbit at the same distance from the Earth B MEOs orbit at
approxi-mately 9,000 to 10,000 miles above Earth D LEOs and MEOs do not orbit
at the same distance from the Earth
ChApTEr 9: SECurITy STANdArdS ANd SErvICES
You are acting as a security consultant for a company wanting to
de-1
crease their security risks As part of your role, they have asked that
you develop a security policy that they can publish to their
employ-ees This security policy is intended to explain the new security rules
and define what is acceptable and not acceptable from a security
standpoint as well as defining the method by which users can gain
access to IT resources What element of AAA is this policy a part of?
A Authentication
B Authorization
C Access Control
D Auditing
Correct answer and explanation: C Access control is defined as a policy,
software component, or hardware component that is used to grant or deny
access to a resource Because this policy is defining how to access resources,
it is considered part of access control
Incorrect answers and explanations: Answer A is incorrect because this
type of written policy is not part of the authentication process although they
may explain the authentication as part of the policy Answer B is incorrect
because this type of written policy is not part of the authorization process In
addition, authorization is not included in the acronym AAA per CompTIA’s
definition Answer D is incorrect because this type of written policy is not
part of the auditing process
One of the goals of AAA is to provide CIA A valid user has
en-2
tered their ID and password, and has been authenticated to access
network resources When they attempt to access a resource on the
network, the attempt returns a message stating, “The server you
are attempting to access has reached its maximum number of
con-nections.” Which part of CIA is being violated in this situation?