1

elbowshelmetNetworking and Communications

Oct 30, 2013 (4 years and 13 days ago)

204 views

1.

Why are dialer profiles favored over dialer lists for configuring DDR on
a
n ISDN capable router?

a.

They require the use of a dialer map command to provide the correct
dialing information for the remote DDR interface

b.

They only allow a one
-
to
-
one correspondenc
e between the two DDR
interfaces at each end of the link

c.

They allow physical interfaces to dynamically take on different
characteristics based on incoming or outgoing call requirements¡Ì

d.

They can configure B channels of an ISDN interface with different IP
subnets



2.

What is a management information base (MIB)?

a.

the base line level of network performance

b.

an administrator created database of users, computers, software, and
addressing for the network

c.

a database of information on the structure and perfo
rmance of the
network¡Ì

d.

the base server which stores the maintenance records for the network



3.

Which commands can be used to identify which DLCIs are active? (Choose
two.)

a.

show frame
-
relay map¡Ì

b.

show frame
-
relay lmi

c.

show frame
-
relay pvc¡Ì

d.

s
how fra
me
-
relay interface

e.

show interfaces

f.

show ip route



4.

Which of the following statements correctly describe Frame Relay? (Choose
two.)

a.

operates at Layer 2¡Ì

b.

higher latency than X.25

c.

does not use error or flow control¡Ì

d.

bases most connections on SVC
s

e.

uses tariffs based on the amount of data delivered



5.

Why would data frames be discarded in a Frame Relay network? (Choose two.)

a.

The frame contains an incorrect IP address.

b.

An error has been detected in computing the frame check sequence.¡Ì

c.

The
re is not enough bandwidth dedicated for the data contained in
the frame.

d.

Data is transmitted at a rate greater than the access speed.

e.

The frame contains an incorrect DLCI.¡Ì



6.

Which command configures the SPID on the first B channel of an ISDN
i
nterface?

a.

Router(config)# isdn spid0 spid
-
number [ldn]

b.

Router(config)# isdn spid1 spid
-
number [ldn]

c.

Router(config
-
if)# isdn spid0 spid
-
number [ldn]

d.

Router(config
-
if)# isdn spid1 spid
-
number [ldn]¡Ì



7.

The LAN attached to the Ethernet interface o
f the Raleigh router shown in
the
g
raphic is addressed with private IP addresses. If one public IP is
assigned to the company, which commands could be used in a configuration
that allows all devices with private IPs in this network to access the
Internet?
(Choose two.)

a.

ip nat inside source list 1 interface serial0 overload¡Ì

b.

ip nat outside source list 1 interface serial0 overload

c.

ip nat inside serial0

d.

ip nat inside source list 1 pool Raleigh overload¡Ì

e.

ip nat inside Raleigh overload

f.

ip inside nat sour
ce list 1 interface serial0 Raleigh



8.

Which items describe the ISDN D channel? (Choose three.)

a.

defined as the primary channel for transferring ISDN data

b.

transfers control information¡Ì

c.

is always up¡Ì

d.

provides 64kbps for both BRI and PRI

e.

uses s
ignaling protocol specified by Q.921¡Ì

f.

uses signaling protocol specified by Q.931



9.

An administrator consoled into the Jelly router needs to telnet to the
Butter router. What DLCI will the Jelly router place in the frame to
perform this
o
peration?


a.

110

b.

115

c.

220

d.

225¡Ì



10.

A network administrator needs to decide which NOS/OS to use on the
network. There are multiple remote offices with twenty employees each
which connect to the network through dial
-
up connections. Which packages
could be used

on the computers the remote clients dial in to? (Choose
two.)

a.

Windows NT Workstation

b.

Windows 2000 Professional

c.

Windows 2000 Server¡Ì

d.

Windows 2000 Advanced Server¡Ì



11.

An ISDN router is configured for DDR as shown in the graphic.
Immediately aft
er a user in the company attempts to connect to the
Internet, another user in the company tries to download a file using
FTP. What will happen? (Choose two.)

a.

The user that opened the browser will connect to the Internet
because the

DDR link will consider
this traffic interesting.¡Ì

b.

The Internet user will be disconnected because the FTP data will
cause the DDR link to shut down.

c.

The DDR link will allow the FTP traffic because it is interesting.

d.

The DDR link will not allow the FTP traffic because it is no
t
interesting.

e.

The FTP connection will fail because the DDR link is already in use
for the Internet connection.

f.

The FTP connection will succeed because the web user already opened
the DDR link.¡Ì



12.

What is the Layer 2 ISDN signaling protocol?

a.

HD
LC

b.

LCP

c.

PPP

d.

BRI

e.

PRI

f.

LAPD¡Ì



13.

A network administrator is asked to desig
n a system to allow
simultaneou
s access to the Internet for 250 users. The ISP for this
network can only supply five public IPs. What can be used to accomplish
this task?

a.

ro
utable translation

b.

dynamic translation

c.

static translation

d.

port address translation¡Ì



14.

Given the accompanying diagram, what would be the result of using the
following access
-
list statements as a part of the NAT configuration on
the router?

acces
s
-
list 10 permit 192.168.10.0 0.0.0.255

access
-
list 10 permit 192.168.11.11 0.0.0.0

access
-
list 10 deny any


a.

All traffic from 192.168.10.0 will be translated.¡Ì

b.

All traffic from 192.168.11.0 will be translated.

c.

All traffic from 192.168.10.0 and 192.168.
11.0 will be translated.

d.

All traffic destined for 192.168.10.0 will be translated.

e.

A
ll traffic destined for 192.168.11.0 will be translated.

f.

All traffic destined for 192.168.10.0 and 192.168.11.0 will be
translated.




15.

Which of the following IP
addresses are defined by RFC 1918 as private
addresses? (Choose three.)

a.

192.168.146.0/22¡Ì

b.

172.10.25.0/16

c.

172.31.0.0/16¡Ì

d.

20.0.0.0/8

e.

10.172.92.8/29¡Ì





16.

When PPP authentication is enabled, which of the following may be
checked before e
stablishing a PPP link between two devices? (Choose
two.)

a.

enable password on the remote device

b.

ip host configuration on the remote device

c.

security server database username and password for the remote
device¡Ì

d.

hostname and enable password on the local d
evice

e.

local database username and password for the remote device¡Ì



17.

Tariffs are based on the amount of data delivered rather than connection
time or distance. Which type of WAN connection use tariffs?

a.

X.25¡Ì

b.

DSL

c.

ISDN

d.

Frame Relay

e.

Leased line



18.

Which statement explains why basic DSL is an unpopular WAN connectivity
choice for enterprise computer departments that support home users?

a.

DSL offers insufficient bandwidth to home users.

b.

DSL requires the installation of new cables, which is n
ot always
possible for home users.

c.

D
SL dialup connection time is too slow for business use.

d.

DSL has limited geographical availability.¡Ì



19.

Which of the following are functions of the Local Management Interface
used in Frame Relay networks? (Choos
e three.)

a.

exchange information about the status of virtual circuits¡Ì

b.

map DLCIs to network addresses¡Ì

c.

provide flow control

d.

provide error notification

e.

provide congestion notification¡Ì

f.

send keepalive packets to verify operation of the PVC



20.

W
hy was NAT created? (Choose two.)

a.

to create firewalls on routers

b.

to conserve IP addresses¡Ì

c.

to translate domain names into IP addresses

d.

to map network addresses to the corresponding data link address

e.

to hide internal addresses from external devices¡Ì



21.

The command output shown in the graphic was taken from a Cisco 806
broadband router. Which kind of address translation is in effect on this
router?

a.

static

b.

dynamic

c.

overload¡Ì

d.

private

e.

public



22.

Which of the following switching types wil
l allow the communication
devices in the provider's network to be shared and only allocated to an
individual subscriber during data transfer?

a.

circuit
-
switched

b.

packet
-
switched¡Ì

c.

frame
-
switched

d.

dedicated
-
switched lines

e.

lease
-
switched



23.

Which typ
e of circuit is created when a switch, upon bootup, loads a pre

configured table containing the route through a packet
-
switched network?

a.

POTS

b.

SVC

c.

BRI

d.

PRI

e.

PVC¡Ì



24.

Which of the following describes the PAP protocol? (Choose two.)

a.

sends unencrypt
ed authentication passwords¡Ì

b.

performs a three
-
way handshake

c.

allows repeated login attempts¡Ì

d.

uses the remote router hostname to verify identity

e.

sends a random challenge throughout the session



25.

Which of the following can be concluded from the
router output displayed


in the graphic? (Choose two.)

a.

The local DLCI number of this PVC is 100.¡Ì

b.

The interface has been configured for subinterfaces and this map is
for subinterface 0.

c.

Inverse ARP has determined the remote ip address as 10.140.1.1.¡Ì

d.

The LMI type is ANSI (0x64).

e.

There is currently no congestion on the link.



26.

When planning simple WAN connections for a small company, which feature
of the three layer hierarchical model makes it a good choice for the WAN
topology.

a.

It provides f
or redundancy.

b.

It allows for easy WAN expansion in case of company growth.¡Ì

c.

It is less expensive.

d.

It provides faster connection time.

e.

It provides less latency and jitter.


27.

Which Internet protocol was developed to configure diskless clients on a


netw
ork?

a.

DHCP

b.

TFTP

c.

SFTP

d.

BOOTP¡Ì



28.

Which command will provide for CHAP authentication if the hostname on a
challenging router is tampa with a password of florida?

a.

username tampa password florida¡Ì

b.

username tampa florida

c.

hostname tampa password fl
orida

d.

hostname tampa florida



29.

What is the default read
-
only community string on SNMP enabled devices?

a.

private

b.

public¡Ì

c.

personal

d.

publish



30.

Which items are associated with every syslog message at the time of
logging? (Choose three.)

a.

fa
cility¡Ì

b.

solicited message

c.

textual log message¡Ì

d.

notification message

e.

time stamp¡Ì





31.

Which of the following LCP options can be configured for PPP? (Choose
three.)

a.

CHAP¡Ì

b.

Stacker¡Ì

c.

IPCP

d.

CDPCP

e.

Multilink¡Ì



32.

The WAN connectio
n for a nationwide company with 250 offices must
support constant connections to core layer services for file sharing,
and occasional Internet access. Which combination of WAN technologies
will meet these needs with minimum expense?

a.

Frame Relay PVC for In
ternet access and ATM for file server access

b.

Frame Relay PVC for Internet access and ISDN for file server access

c.

ISDN for Internet access and X.25 for file server access

d.

ISDN for Internet access and Frame Relay PVC for file server access



33.

Which

network standards emerged from the IETF or OSI community to allow

for interoperability of management across different network platforms?
(Choose two.)

a.

SMI

b.

SNMP¡Ì

c.

CMIP¡Ì

d.

RMAN

e.

SMTP



34.

How many separate B channel circuits can be provisioned on a
PRI
interface that uses a T1 line for connectivity?

a.

2

b.

16

c.

23¡Ì

d.

24

e.

30

f.

128



35.

Which command would be used to exclude the IP address 192.168.24.5 from

the DHCP address pool on a router?

a.

Router(dhcp
-
config)# ip dhcp excluded
-
address 192.168.24.5

b.

Router# ip dhcp excluded
-
address 192.168.24.5

c.

Router(config
-
excluded)# ip dhcp excluded
-
address 192.168.24.5

d.

Router(config)# ip dhcp excluded
-
address 192.168.24.5¡Ì

e.

Router(config)# excluded
-
address 192.168.24.5

f.

Router(dhcp
-
config)# excluded
-
address 192
.168.24.5



36.

ITU
-
T Q.921 specifies the use of which protocol for sending control and
signalling messages between the router and the ISDN switch?

a.

HDLC

b.

IPCP

c.

LAPB

d.

LAPD¡Ì

e.

NCP

f.

SS7



37.

Which of the following describe SNMP? (Choose two.)

a.

It is

a network layer protocol.¡Ì

b.

It is an application layer protocol.

c.

SNMP controls email delivery.

d.

SNMP uses TCP.

e.

SNMP uses UDP.¡Ì

f.

It is used by the telecommunications community to monitor and
control networks.



38.

What does the command debug isdn
q921 display?

a.

exchange of call setup and teardown messages

b.

PAP and CHAP authentication traffic

c.

Layer 2 messages on the D channel¡Ì

d.

protocol errors and statistics

e.

Layer 2 messages on the B channel



39.

What is placed in the address field of a fram
e that will travel from the
DC office of ABC company to the Orlando office?

a.

MAC address of the Orlando router

b.

MAC address of the DC router

c.

192.168.1.25

d.

192.168.1.26

e.

DLCI 100

f.

DLCI 200¡Ì



40.

What is Mac OS X Darwin?

a.

a subsystem to integrate TCP/
IP networking into the Mac OS

b.

the UNIX based core of the Mac OS¡Ì

c.

a Mac graphics package

d.

the Mac OS GUI



41.

Which of the following are commonly used as Data Communications
Equipment? (Choose two.)

a.

modem¡Ì

b.

router

c.

CSU/DSU¡Ì

d.

ISDN Switch

e.

Frame Re
lay Switch



42.

Which of the following are the default SNMP port numbers? (Choose two.)

a.

161¡Ì

b.

162¡Ì

c.

171

d.

173



43.

A network administrator is troubleshooting an ISDN connectivity problem.
Users are complaining they cannot connect to the Interne
t. The network
administrator suspects the ISDN connection attempt is timing out before
a connection can be established. What command would the network
administrator use to determine what the "wait for carrier" timeout value
is set to?

a.

show isdn status

b.

sh
ow isdn active

c.

show dialer¡Ì

d.

show interfaces bri0/0

e.

debug isdn q931

f.

show ISDN interfaces



44.

Which command would produce the output shown in the graphic?

a.

show ip dhcp server statistics

b.

show ip dhcp binding

c.

debug ip dhcp server events¡Ì

d.

debug
ip dhcp binding



45.

Which statements about DHCP are true? (Choose three.)

a.

DHCP uses TCP.

b.

DHCP uses UDP.¡Ì

c.

DHCP sends messages to the server on port 67.¡Ì

d.

DHCP sends messages to the server on port 68.

e.

DHCP sends messages to the client on port 67.


f.

DHCP sends messages to the client on port 68.¡Ì





46.

What does a DLCI of 0 indicate about a frame? (Choose two.)

a.

This is the first data frame sent by the router.

b.

This is a management frame.¡Ì

c.

The encapsulation type is Cisco.

d.

The encapsu
lation type is IETF.

e.

The LMI type is Ansi or q933a.¡Ì

f.

The LMI type is Cisco.



47.

Which of the following describes the WAN devices and cabling shown in
the graphic? (Choose two.)

a.

A null
-
modem cable is used between RouterD and DeviceC for
connectivi
ty.

b.

A DB
-
25 or DB
-
9 serial cable is connected to interface S0/0 of
RouterA.

c.

DeviceB and DeviceC are DCE devices.¡Ì

d.

The same encoding scheme must be used by DeviceB and DeviceC.¡Ì

e.

A synchronous serial connection exists between DeviceB and DeviceC.




48.

Which of the following describes Active Directory?

a.

a file system management protocol

b.

a database management protocol

c.

a database of network addresses and their associated workstation
identifiers created by DHCP

d.

a centralized point of management of u
sers and groups¡Ì



49.

Which of the following terms describes a device that will put data on
the local loop?

a.

DLCI

b.

CO

c.

DCE¡Ì

d.

DTE

e.

PRI

f.

BRI



50.

Which of the following statements regarding point
-
to
-
point subinterfaces
are true? (Choose two.)

a.

A
point
-
to
-
point subinterface on one router must be connected to a
similar subinterface on a remote router.

b.

Each point
-
to
-
point subinterface connection is configured with its
own subnet.¡Ì

c.

The DLCIs configured on the remote and local routers must be the
sa
me for the PVC.

d.

LMI frames are not transmitted through a subinterface.

e.

Routing updates in point
-
to
-
point networks are not subject to the
split
-
horizon rule.¡Ì


51.

A company needs a WAN connection that is capable of transferring voice,

video, and data at a
minimum data rate of 155 Mbps. Which WAN connection
is the best choice?

a.

X.25

b.

DSL

c.

ATM¡Ì

d.

ISDN BRI

e.

ISDN PRI



52.

Which of the following devices is used to establish the communications
link between the customer equipment and the local loop for digita
l
lines?

a.

terminal adapter

b.

modem

c.

CSU/DSU¡Ì

d.

PBX switch

e.

ISDN switch

f.

Frame Relay Switch



53.

Which of the following statements are true about Frame Relay? (Choose
three.)

a.

Frame Relay operation is defined by a series of ISO standards.

b.

Frame Relay i
s a packet switched, connection
-
oriented, wide area
network service.¡Ì

c.

Frame Relay only supports point
-
to
-
point connections.

d.

A router can be considered as data terminal equipment (DTE) in a
frame relay system.¡Ì

e.

Frame Relay is a cell switched, connectio
n
-
oriented, wide area
network service.

f.

Frame Relay networks use a subset of the HDLC protocol to carry
information.¡Ì



54.

A technician is testing the functionality of a recently installed
router. The technician is unable to ping the serial interface

of a
remote router. The technician executes the show interface serial0/0
command on the local router and sees the following line in the
output:Serial0/0 is up, line protocol is downWhat are possible causes
for this command output? (Choose three.)

a.

remote
CSU/DSU failure¡Ì

b.

serial cable missing

c.

interface shutdown

d.

keepalives not being sent¡Ì

e.

clocking signal missing¡Ì



55.

A router needs to forward a message received from a host. How does the
router identify the correct VC to forward the message? (Cho
ose two.)

a.

The router forwards the frame to all ports in the network and learns
the address from the reply frame.

b.

The destination host IP address is embedded in the DLCI.

c.

The router searches Inverse ARP tables for maps of DLCIs to IP
addresses.¡Ì

d.

A tabl
e of static mappings can be searched.¡Ì

e.

The router broadcasts a request for the required IP address.



56.

Which command is used, on an existing ISDN connection, to display
current call status and the connected remote device?

a.

show isdn status

b.

show d
ialer¡Ì

c.

show interfaces bri0/0

d.

debug isdn q921



57.

Given the accompanying graphic, which statement would provide a single
mapping of a public address to a private address?

a.

ip nat inside source static 128.12.5.23 10.0.0.125

b.

ip nat inside source st
atic 10.0.0.125 128.12.5.23¡Ì

c.

ip nat pool tampa 10.0.0.125 128.12.5.23 netmask 255.255.255.0

d.

ip pat inside static 10.0.0.125 128.12.5.23



58.

Which developmental decisions proved to be the keys for the success of
UNIX? (Choose two.)

a.

writing the cod
e using a higher
-
level programming language¡Ì

b.

allowing the code to be open source

c.

creating a portable operating system¡Ì

d.

creating licenses to purchase the software

e.

implementing a graphical user interface (GUI)



59.

Which of the following are suppo
rted by a BRI interface on a router?
(Choose two.)

a.

Two independent channels that can carry analog data with a bandwidth
of 64 KHz.

b.

A single 128 Kbps digital bearer channel.

c.

Two multiplexed channels carrying digital data.¡Ì

d.

A single 64 Kbps signaling ch
annel.

e.

A multiplexed data channel that can only handle SS7 information.

f.

A 16 Kbps delta channel used for signaling purposes.¡Ì



60.

How will data be transmitted from the router to the ISP if the router
has the two links shown in the graphic?

a.

Both l
inks will transmit data at the same rate.

b.

1544 bits can be transmitted simultaneously from the router over the
T1 line.

c.

Both links will transmit bits one by one.¡Ì

d.

The 56K link will transmit a maximum of 53 bits at the same time.





61.

Whic
h high
-
performing, versatile version of UNIX is the most widely used
implementation for large networks and Internet web servers?

a.

Hewlett Packard Unix (HP
-
UX)

b.

Berkeley Software Design (BSD)

c.

IBM Unix (AIX)

d.

Sun Solaris¡Ì

e.

Santa Cruz Operation (SCO)




62.

Which of the following is a function of a DCE device?

a.

determines the next
-
hop address for a packet

b.

multiplexes signals from several sources

c.

adapts information for use on a service provider's network¡Ì

d.

used to directly connect two DTEs to simulate a

WAN network



63.

A network administrator in the United States has been asked to provide
the network with an ISDN WAN link. The router available to provide the
WAN connection is a non
-
modular cisco router with two serial
connections. What must be done

to adapt this router for the ISDN
connection?

a.

Nothing. The router is already suitable.

b.

Purchase a BRI WAN interface card to install in the router.

c.

Purchase a U interface to install in the router.¡Ì

d.

Purchase a TA/NT1 device to install on the router.