Semestre 4 -
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1 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?
port address translation
2 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
3 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?
4 Which of the following IP addresses are defined by RFC 1918 as private
addresses? (Choose three.)
5 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.
6 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.
7 Which command would be used to exclude the IP address 192.168.24.5 from the
DHCP address pool on a router?
Router(dhcp-config)# ip dhcp excluded-address 192.168.24.5
Router# ip dhcp excluded-address 192.168.24.5
Router(config-excluded)# ip dhcp excluded-address 192.168.24.5
Router(config)# ip dhcp excluded-address 192.168.24.5
Router(config)# excluded-address 192.168.24.5
Router(dhcp-config)# excluded-address 192.168.24.5
8 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
9 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
10 Which of the following devices is used to establish the communications
link between the customer equipment and the local loop for digital lines?
Frame Relay Switch
11 Which of the following statements are true about Frame Relay? (Choose
Frame Relay operation is defined by a series of ISO standards.
Frame Relay is a packet switched, connection-oriented, wide area network
Frame Relay only supports point-to-point connections.
A router can be considered as data terminal equipment (DTE) in a frame relay
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.
12 ITU-T Q.921 specifies the use of which protocol for sending control and
signaling messages between the router and the ISDN switch?
13 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
14 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
DSL dialup connection time is too slow for business use.
DSL has limited geographical availability.
15 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.
16 Which of the following terms describes a device that will put data on the
17 Which of the following are supported by a BRI interface on a router? (Choose
Two independent channels that can carry analog data with a bandwidth of 64
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.
18 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
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.
19 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
20 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.
21 Which of the following are commonly used as Data Communications Equipment?
Frame Relay Switch
22 Which of the following LCP options can be configured for PPP? (Choose
23 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
24 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
25 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
26 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 interesting.
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
The FTP connection will succeed because the web user already opened the DDR link.
27 Which command configures the SPID on the first B channel of an ISDN
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]
28 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
29 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
30 How many separate B channel circuits can be provisioned on a PRI interface
that uses a T1 line for connectivity?
31 Which operating systems support multiuser capability? (Choose three.)
32 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
33 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.
34 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
35 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
36 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 ip route
37 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
keepalives not being sent
clocking signal missing
38 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.
39 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
LMI frames are not transmitted through a subinterface.
Routing updates in point-to-point networks are not subject to the split-horizon
40 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
Inverse ARP has determined the remote ip address as 10.140.1.1.
The LMI type is ANSI (0x64).
There is currently no congestion on the link.
41 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
42 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
PPP operates at all layers of the OSI model.
PPP uses the data link layer to configure such options as error detection and
PPP provides a mechanism to multiplex several network layer protocols.
PPP uses Network Control Protocols (NCP) to test and maintain connectivity
PPP can be configured on both synchronous and asynchronous serial interfaces.
43 Which of the following describes the CHAP protocol? (Choose three.)
exchanges a random challenge number during the session to verfiy 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
44 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?
45 How does Frame Relay technology process frames that contain errors? (Choose
Frame Relay services depend on the upper layer protocols to handle error
It requires the receiving device to request that the sender retransmit erroneous
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
The frame relay switch notifies the sender that errors were detected.
46 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 RouterA.
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 DeviceC.
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