3.1 CCNA 4 - Practice Final

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

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

Which of the following describe functions of the Point-to-Point
protocol with regards to the OSI model? (Choose three.)
PPP uses Layer 3 of the OSI model to establish and
maintain a session between devices.
PPP operates at all layers of the OSI model.
PPP uses the data link layer to configure such
options as error detection and compression.
PPP provides a mechanism to multiplex several
network layer protocols.
PPP uses Network Control Protocols (NCP) to test and
maintain connectivity between devices.
PPP can be configured on both synchronous and
asynchronous serial interfaces.

Which of the following statements regarding point-to-point
subinterfaces are true? (Choose two.)
A point-to-point subinterface on one router must be
connected to a similar subinterface on a remote router.
Each point-to-point subinterface connection is
configured with its own subnet.
The DLCIs configured on the remote and local routers must
be the same for the PVC.
LMI frames are not transmitted through a subinterface.
Routing updates in point-to-point networks are
not subject to the split-horizon rule.


How will data be transmitted from the router to the ISP if
the router has the two links shown in the graphic?
Both links will transmit data at the same rate.
1544 bits can be transmitted simultaneously from the
router over the T1 line.
Both links will transmit bits one by one.
The 56K link will transmit a maximum of 53 bits at
the same time.

A network administrator is asked to design a system to
allow simultaneous 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?
routable translation
dynamic translation
static translation
port address translation

Which of the following statements are true about Frame Relay?
(Choose three.)
Frame Relay operation is defined by a series of ISO standards.
Frame Relay is a packet switched, connection-oriented,
wide area network service.
Frame Relay only supports point-to-point connections.
A router can be considered as data terminal equipment
(DTE) in a frame relay system.
Frame Relay is a cell switched, connection-oriented, wide area
network service.
Frame Relay networks use a subset of the HDLC
protocol to carry information.

Why would data frames be discarded in a Frame Relay network?
(Choose two.)
The frame contains an incorrect IP address.
An error has been detected in computing the
frame check sequence.
There is not enough bandwidth dedicated for the data
contained in the frame.
Data is transmitted at a rate greater than the access speed.
The frame contains an incorrect DLCI.


Which of the following can be concluded from the router output
displayed in the graphic? (Choose two.)
The local DLCI number of this PVC is 100.
The interface has been configured for subinterfaces and this
map is for subinterface 0.
Inverse ARP has determined the remote ip address
The LMI type is ANSI (0x64).
There is currently no congestion on the link.

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.
It provides for redundancy.
It allows for easy WAN expansion in case of company growth.
It is less expensive.
It provides faster connection time.
It provides less latency and jitter.


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 network administrator has been asked to provide the
network in the United States 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 one of the serial interfaces
of this router for the ISDN connection?
Nothing. The router is already suitable.
Purchase a BRI WAN interface card to install in the router.
Purchase a U interface to install in the router.
Purchase a TA/NT1 device to install on the router.

How does Frame Relay technology process frames that
contain errors? (Choose two.)
Frame Relay services depend on the upper
layer protocols to handle error recovery.
It requires the receiving device to request that the
sender retransmit erroneous frames.
FECN, BECN, and DE bits are set in the frames to
minimize errors.
The receiving device drops any frames that
contain errors without notifying the sender.
The frame relay switch notifies the sender that errors
were detected.

Which statements about DHCP are true? (Choose three.)
DHCP uses TCP.
DHCP uses UDP.
DHCP sends messages to the server on port 67.
DHCP sends messages to the server on port 68.
DHCP sends messages to the client on port 67.
DHCP sends messages to the client on port 68.

Which command configures the SPID on the first B
channel of an ISDN interface?
Router(config)# isdn spid0 spid-number [ldn]
Router(config)# isdn spid1 spid-number [ldn]
Router(config-if)# isdn spid0 spid-number [ldn]
Router(config-if)# isdn spid1 spid-number [ldn]


Which command would produce the output shown in the graphic?
show ip dhcp server statistics
show ip dhcp binding
debug ip dhcp server events
debug ip dhcp binding

Which commands can be used to identify which DLCIs are
active? (Choose two.)
show frame-relay map
show frame-relay lmi
show frame-relay pvc
show frame-relay interface
show interfaces
show ip route

When PPP authentication is enabled, which of the following
may be checked before establishing a PPP link between
two devices? (Choose two.)
the enable password on the remote device
the ip host configuration on the remote device
the security server database for the username
and password of the remote device
the hostname and enable password on the local device
the local database for the username and password
of the remote device

Which of the following are supported by a BRI interface on a
router? (Choose two.)
Two independent channels that can carry analog
data with a bandwidth of 64 KHz.
A single 128 Kbps digital bearer channel.
Two multiplexed channels carrying digital data.
A single 64 Kbps signaling channel.
A multiplexed data channel that can only handle SS7 information.
A 16 Kbps delta channel used for signaling purposes.


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 operation?


What is placed in the address field of a frame that will travel
from the DC office of ABC company to the Orlando office?
MAC address of the Orlando router
MAC address of the DC router
DLCI 100
DLCI 200

The WAN connection 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?
Frame Relay PVC for Internet access and ATM for file
server access
Frame Relay PVC for Internet access and ISDN for file
server access
ISDN for Internet access and X.25 for file server access
ISDN for Internet access and Frame Relay PVC for file
server access

What does a DLCI of 0 indicate about a frame? (Choose two.)
This is the first data frame sent by the router.
This is a management frame.
The encapsulation type is Cisco.
The encapsulation type is IETF.
The LMI type is Ansi or q933a.
The LMI type is Cisco.

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?

What are three features of the CHAP protocol? (
Choose three.)
exchanges a random challenge number during
the session to verify identity
sends authentication password to verify identity
prevents transmission of login information in
plain text
disconnects the PPP session if authentication fails
initiates a two-way handshake

Which of the following devices is used to establish the
communications link between the customer equipment
and the local loop for digital lines?
terminal adapter
PBX switch
ISDN switch
Frame Relay Switch

Which command would be used to exclude the IP address from the DHCP address pool on a router?
Router(dhcp-config)# ip dhcp excluded-address
Router# ip dhcp excluded-address
Router(config-excluded)# ip dhcp excluded-address
Router(config)# ip dhcp excluded-address
Router(config)# excluded-address
Router(dhcp-config)# excluded-address

A router needs to forward a message received from a host.
How does the router identify the correct VC to forward the
message? (Choose two.)
The router forwards the frame to all ports in the network
and learns the address from the reply frame.
The destination host IP address is embedded in the DLCI.
The router searches Inverse ARP tables for maps of
DLCIs to IP addresses.
A table of static mappings can be searched.
The router broadcasts a request for the required IP address.

Which of the following switching types will allow the
communication devices in the provider's network to
be shared and only allocated to an individual subscriber
during data transfer?
dedicated-switched lines

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

Which of the following describes the PAP protocol? (Choose two.)
sends unencrypted authentication passwords
performs a three-way handshake
allows repeated login attempts
uses the remote router hostname to verify identity
sends a random challenge throughout the session

Which of the following protocols can be used to encapsulate
data traffic sent from a router BRI interface? (Choose two.)
Link Access Protocol - Data
High-Level Data Link Control
Logical Link Control
Serial Data Link Control
Point to Point protocol
Binary Synchronous Control protocol

Which statement explains why basic DSL is an unpopular
WAN connectivity choice for enterprise computer
departments that support home users?
DSL offers insufficient bandwidth to home users.
DSL requires the installation of new cables, which is not
always possible for home users.
DSL dialup connection time is too slow for business use.
DSL has limited geographical availability.

Which of the following are functions of the Local Management
Interface used in Frame Relay networks? (Choose three.)
exchange information about the status of
virtual circuits
map DLCIs to network addresses
provide flow control
provide error notification
provide congestion notification
send keepalive packets to verify operation of the PVC


An ISDN router is configured for DDR as shown in the
graphic to provide Internet connectivity for the company.
Immediately after a user in the company attempts opens
a web browser to connect to the Internet, another user in
the company tries to download a file using FTP.
What will happen? (Choose two.)
The user that opened the browser will connect
to the Internet because the DDR link will consider
this traffic interesting.
The Internet user will be disconnected because the FTP
data will cause the DDR link to shut down.
The DDR link will allow the FTP traffic because it is
The DDR link will not allow the FTP traffic because it
is not interesting.
The FTP connection will fail because the DDR link is
already in use for the Internet connection.
The FTP connection will succeed because the
web user already opened the DDR link.

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

Which of the following is a function of a DCE device?
determines the next-hop address for a packet
multiplexes signals from several sources
adapts information for use on a service provider's network
used to directly connect two DTEs to simulate a WAN network

Which operating systems support multiuser capability?
(Choose three.)
Windows 98
Windows ME
Windows XP
Windows 2000

Why was NAT created? (Choose two.)
to create firewalls on routers
to conserve IP addresses
to translate domain names into IP addresses
to map network addresses to the corresponding data
link address
to hide internal addresses from external devices

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

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


The LAN attached to the Ethernet interface of the Raleigh router
shown in the graphic 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.)
ip nat inside source list 1 interface serial0 overload
ip nat outside source list 1 interface serial0 overload
ip nat inside serial0
ip nat inside source list 1 pool Raleigh overload
ip nat inside Raleigh overload
ip inside nat source list 1 interface serial0 Raleigh


Which of the following describes the WAN devices and cabling
shown in the graphic? (Choose two.)
A null-modem cable is used between RouterD and DeviceC
for connectivity.
A DB-25 or DB-9 serial cable is connected to interface S0/0 of
DeviceB and DeviceC are DCE devices.
The same encoding scheme must be used by DeviceB
and DeviceC.
A synchronous serial connection exists between DeviceB and

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

What does the command debug isdn q921 display?
exchange of call setup and teardown messages
PAP and CHAP authentication traffic
Layer 2 messages on the D channel
protocol errors and statistics
Layer 2 messages on the B channel

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 down

What are possible causes for this command output? (Choose three.)
remote CSU/DSU failure
serial cable missing
interface shutdown
keepalives not being sent
clocking signal missing