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Practice Final_S4_phan 2

   Trong: CCNA
 
May 18 2008, 03:44 PM     Bởi: Guest_lehuy0305_*
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.
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.
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 Internet connection.
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 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]
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.
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.
30.
How many separate B channel circuits can be provisioned on a PRI interface that uses a T1 line for connectivity?
2
16
23
24
30
128
31.
ITU-T Q.921 specifies the use of which protocol for sending control and signaling messages between the router and the ISDN switch?
HDLC
IPCP
LAPB
LAPD
NCP
SS7
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
192.168.1.25
192.168.1.26
DLCI 100
DLCI 200
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 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
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 this operation?
110
115
220
225
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 interfaces
show ip route
37.
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.
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 PVC.
LMI frames are not transmitted through a subinterface.
Routing updates in point-to-point networks are not subject to the split-horizon rule.
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 subinterface 0.
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.
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.
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 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.
43.
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
44.
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
45.
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.
46.
Which operating systems support multiuser capability? (Choose three.)
Linux
Windows 98
Windows ME
Windows XP
Windows 2000

 

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