Tài liệu Fast Way to get your Certification - Exam :640-605 pdf

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C. It is both a global and an interface command.
D. It defines the type of signaling used by the ISDN service provider switch.


Answer: C
Explanation: Switch type can be defined globally or on interfaces. Before IOS 11.3T
switch type could only be defined globally.

Note: The isdn switch-type switch-type command is used to configure the ISDN BRI
switch type, as specified by the local service provider. Examples of switch types are:
DMS-100 BRI Custom and 5ESS Custom BRI.

Reference: Cisco, Configuring ISDN BRI

Incorrect Answers
A: It is a BRI controller command, not a PRI controller command.
B: It specifies the ISDN provider switch type, not the PRI controller line code.
D: We define what type of signaling the local router should use. We cannot configure the
telco router.



QUESTION NO: 6
Which command displays the status information including LAPB for an interface
serial0 that is running IP traffic over an X.25 network.
Find the correct command in the exhibit list and type it exactly as shown?


Answer: show interface serial0
Explanation: To confirm that the X25 serial interface is functioning correctly study the
output of the show interface serial0 command.

Reference: Cisco Configuring X.25



QUESTION NO: 7
Given the configuration
Access-list 101 permit ip any any
Access-list 1.1 deny TCP any any eq ftp
Dialer list 2 protocol IP list 101

Why does the configuration fail to prevent FTP traffic from dialing the line?

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A. The final configuration line allows all IP traffic to be forwarded.
B. The terms “any any” in the deny line allow FTP to be forwarded.
C. Since FTP uses two sockets, both must be defined to prevent packet forwarding.
D. The “deny” restriction is read after the “permit” line has already allowed packet
forwarding.


Answer: D
Explanation: The access lists are matched in order. Only the first matching access list is
applied. In this scenario the first access list:

Access-list 101 permit ip any any

is applied. It will permit any traffic. We should swap the order of the access list so that
the deny access list is applied first.



QUESTION NO: 8
Which command configures a T1 PRI for binary 8.0 substitution line coding.
Find the correct command in the exhibit list and type it exactly as shown.


Answer: linecode b8zs
Explanation: The service-module t1 linecode command configures the T1 CSU/DSU
for operation on Binary 8 Zeroes Substitution (B8ZS) or Alternate Mark Inversion (AMI)
T1 lines. Syntax:
service-module t1 linecode {b8zs | ami}

Note: B8ZS is a method of ensuring density on a T1 line by substituting intentional bi-
polar violations in bit positions 4 and 7 for a sequence of eight zero bits.

Reference: service-module t1 linecode
http://www.cisco.com/warp/public/471/65.html



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QUESTION NO: 9

Based on the network illustrated in the Exhibit, what is the configuration
command for data encapsulation on the serial interface 0 on Router R1?

A. Encapsulation X25
B. Encapsulation X21
C. Encapsulation HDLC
D. Encapsulation X121


Answer: A
Explanation: To use X25 on an interface simply use the encapsulation X25 interface
command.



QUESTION NO: 10
Which T1 controller command configures the controller for ISDN PRI operation?

A. Framing
B. Line code
C. PRI-Group
D. ISDN Switch-type


Answer: C
Explanation: The pri-group [timeslots range] command configures ISDN PRI. The
command must be issued in controller configuration mode. For example:
RouterTK(config-controller)# pri-group timeslots 1-10
Note: ISDN PRI is typically used on T1 or E1 lines.
Reference: Cisco, Configuring ISDN PRI
Cisco, Configuring ISDN BRI

Incorrect Answers
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A: Only defines framing characteristics, for example as cyclic redundancy check 4
(CRC4).
B: Only defines the line code, for example high-density bipolar 3 (HDB3).
D: The isdn switch-type switch-type command is used to configure so selects a service
provider switch type that accommodates PRI (or BRI). Furthermore the isdn switch-
type command is general configuration command, not a controller command.
Note: Examples of switch types are: DMS-100 BRI Custom and 5ESS Custom BRI.



QUESTION NO: 11
Which three statements about X.25 are true? (Choose three)

A. It is more commonly used with SVC’s.
B. It is available at speeds higher than 64-Kbps.
C. It is not used unless you need to reach small remote locations with little
technology.
D. It is a reliable protocol because there is reliability at both X.25, Layer3 and LAPB
Layer2.
E. It is a reliable protocol because the X.25 protocol at Layer3 provides reliability for
the entire protocol stack.


Answer: A, B, D
Explanation:
A: X.25 is commonly with switched virtual circuits.
B: X.25 is available up to T1 speeds (1.544Mbps).
D: LAPB specifies methods for exchanging frames, monitoring frame sequence, missing
frames, and executing frame acknowledgements and retransmission when necessary.

Reference: Cisco CCNP Remote Access Exam Certification Guide (#640-505), page
227.

Incorrect Answers
C: X.25 is still in use.
E: LAPB also provides reliability.



QUESTION NO: 12
In U.S. which ISDN functional group is provided by the end user device?

A. LE
B. TA
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C. NT1
D. TE2


Answer: C
Explanation: The native ISDN interface on a Cisco router allows the router to be directly
connected to an ISDN NT1 (integrated network termination1) device. In many countries,
the NT1 is provided by the telephone company. In the United States, however, the NT1 is
customer-owned equipment.



QUESTION NO: 13
Which queuing method is enabled by default on low speed Serial Links?

A. No Queuing
B. Custom Queuing
C. Priority Queuing
D. Weighted Fair Queuing


Answer: D
Explanation: Weighted Fair Queuing (WFQ), WFQ is a simple technique that gives low
volume traffic priority on the link. WFQ is enabled by default on low speed Serial Links.



QUESTION NO: 14
Which two statements about the frame relay LMI configuration are True?
(Choose two)

A. There are three possible LMI types.
B. ITU-T QUESTION NO: 933 is the default LMI type.
C. The LMI type must be the same on each end (DTE 2 DTE of the connection).
D. With IOS release 11.2 or later no LMI type needs to be entered.


Answer: A, D
Explanation:
A: The LMI types are ansi, cisco, and q933a.
D: Beginning with Cisco IOS Release 11.2, the software supports Local Management
Interface (LMI) autosense, which enables the interface to determine the LMI type
supported by the switch. Support for LMI autosense means that you are no longer
required to configure the LMI explicitly.
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Reference: Cisco, Configuring Frame Relay



QUESTION NO: 15
In which two situations would implementing a queuing policy other than FIFO be
beneficial? (Choose two)

A. WAN traffic across a T1 link suffers only occasional congestion at which time
certain interactive applications suffer poor performance.
B. A fractional T3 suffers from congestion during normal business hours, time
sensitive applications and server connections time out during the most congested
periods.
C. A T1 WAN connection experiences utilization from 20% to 50% with no
noticeable congestion, link supports several traffic types including file transfers,
SNA and interactive applications.
D. It has become evident that large graphics files transfers between the marketing
office and the central printing facility are adversely affecting interactive
applications whose traffic shares the same T1 link.


Answer: A, D
Explanation:
A: The interactive program should have higher priority.
D: The large file transfers should run at lower priority, for example by using WFQ which
would give low volume traffic priority on the link.

Note: Queuing is only necessary when existing traffic flow is having problems getting
through the router. Implementation of any queuing strategy results in higher delay in the
network.

Incorrect Answers
B: The bandwidth should be increased.
C: With only 20-50% utilization and no congestion there is no need to use another
queuing policy.



QUESTION NO: 16
What is the first configuration step necessary to enable frame relay traffic shaping?

A. Specifying and defining map class.
B. Specify the BECN or FECN for traffic adaptation.
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C. Specify a queuing technique to be used on a frame relay connection.
D. Raise the priority of any virtual circuit that will use traffic shaping above that of
virtual circuits using the same connection but not using traffic shaping.


Answer: A
Explanation: Frame Relay traffic shaping is accomplished through the creation of a map
class.

Note: Frame Relay traffic shaping is a means of controlling the output of traffic across
the Frame Relay network.

Reference: Cisco CCNP Remote Access Exam Certification Guide (#640-507), page 272
Configuring Frame Relay Traffic Shaping
http://www.cisco.com/warp/public/125/traffic_shaping_6151.html




QUESTION NO: 17
Which configuration command assigns all IP traffic to a medium priority queue for
priority list3?
Find the correct command in the Exhibit list and type it exactly as shown.


Answer: priority-list 3 protocol IP medium
Explanation: This command Establishes queueing priorities based on the protocol type.

Syntax: priority-list list-number protocol protocol-name {high | medium | normal |
low} queue-keyword keyword-value

queue-keyword keyword-value are optional

Reference: Cisco, Configuring Priority Queueing



QUESTION NO: 18
With regard to network layer address assignment, what is the effect of using Frame
Relay sub interfaces on a physical interface?

A. The network layer address must be removed from the physical interface.
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B. The sub interfaces should be addresses should be assigned the network broadcast
address of the physical interface.
C. The network layer address of each sub interface must be the same as the physical
interface address.
D. The network layer address of each sub interface must be in the same subnet as the
physical interface address.


Answer: A
Explanation: The physical interface must not have a network layer address.



QUESTION NO: 19
The output from a show frame relay PVC command includes the following line:

DLCI = 300, DLC1 USAGE = LOCAL, PVC STATUS=INACTIVE, INTERFACE =
Serial 0.103

Which statement regarding the output is True?

A. This is a switched virtual circuit (SVC) connection.
B. The connection is tasked for voice over frame transmission.
C. The local connection to the frame relay switch is not working.
D. The connection is up and functional but no traffic is currently flowing across the
circuit.


Answer: D
Explanation: The connections is up, however PVC STATUS = INACTIVE indicates
that no traffic is currently flowing across the circuit.



QUESTION NO: 20
You want to compress traffic on your frame relay connection to maximize the usage
over the WAN. Which compression method should you use?

A. Link Compression
B. Header Compression
C. Payload Compression
D. Predictor Compression


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Answer: C
Explanation: WAN technologies such as Frame Relay, ATM, X.25, and SMDS require
that the header information be untouched so that it can be read by the individual switches
that the transmission crosses. Any implementation of virtual circuits disallows link
compression. In these cases, payload compression is appropriate.

Incorrect Answers
A: Link compression compresses the complete packet, including the header. Link
compression cannot be used for WAN switching technologies, such as frame relay.
B: Only compressing the Headers would not maximize the usage.
D: The Predictor compression method attempts to predict the coming character
sequences. However, Predictor compression cannot directly be used on WAN links. It
is used by link compression for example.



QUESTION NO: 21
Which interface command sets local management interface to use the ANSI 1.617
standard?
Find the correct command in the Exhibit list and type it exactly as shown.


Answer: frame-relay LMI-type ANSI
Explanation: To select the Local Management Interface (LMI) type, use the frame-
relay lmi-type interface configuration command.

Syntax:
frame-relay lmi-type {ansi | cisco | q933a}

There are three LMI types::
Cisco, ANSI - the full version of the name is ANSI standard T1.617 Annex D.), and Q933a.

Reference: Cisco, Frame Relay Commands



QUESTION NO: 22
What is the primary element of a dialer profile?

A. Dialer pool
B. Dialer interface
C. Dialer map class
D. Physical interface
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Answer: B
Explanation: A dialer interface is a logical entity that implements a dialer profile on a
destination by destination basis.



QUESTION NO: 23
Dialer profiles are used for ISDN dial out. Which command is used to review the
source and destination address of the packet that that brought up BRI 0 and to
verify that the dialer came up properly? Find the correct command in the Exhibit
list and type it exactly as shown.


Answer: show dialer interface bri 0
Explanation: To view the status of a dialer interface, the show dialer interface bri 0
command can be of used.



QUESTION NO: 24
Exhibit

dialer hold-queue

The trainee has issued the IOS command listed in the exhibit. The trainee asks you
when packets are saved in the queue specified by the command. What should you
tell the trainee?

A. Interesting outgoing packets are saved while dialing takes place.
B. Interesting outgoing packets are saved during network congestion.
C. Interesting outgoing packets are saved while higher priority traffic is sent.
D. Interesting outgoing packets are saved when a source quench message is received.


Answer: A
Explanation: To allow interesting outgoing packets to be queued until a modem
connection is established, the dialer hold-queue command is used. When the client router
dials, its hold queue timer begins to count down. No additional calls to the same
destination can be made until the time reaches zero. This value is configurable using the
dialer hold-queue command.

Syntax: dialer hold-queue packets timeout seconds
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