Quản trị mạng Chapter5

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Exam questions


1 . When would you use the “dialer isdn speed 64” command?
It is not a valid command
When the ISDN line speed is 64 Kbps
When the ISDN line speed is 64 Mbps
When using robbed-bit signaling

2 . What is a function of the “isdn incoming-voice modem” command?
It allows ISDN modem voice calls
Allows voice calls to use an ISDN BRI interface
It turns on the ISDN modems in an access server
It enables switching of analog calls to internal modems

3 . Which is the correct syntax of the “dialer map” command?

A
B
C
D

4 . Look at the following partial output of the “show run” command: interface BRI0 description Connected to ntt
81019998887654 ip address 10.12.15.5 255.255.255.0 encapsulation ppp dialer idle-timeout 30 dialer load-threshold 40
either dialer map ip 10.12.15.8 name RTB 81019998888901 dialer map ip 10.12.15.9 name RTC 81019998881234 dialer
map ip 10.12.15.4 name RTD 81019998881122 dialer-group l ppp authentication pap ppp multilink Which statement is

true about the type of dial-on demand routing (DDR) being implemented using BRI0?
By configuring legacy DDR on interface BRI0, calls made to all three sites will use the same communication
parameters.
By configuring BRI0 as a member of a dial-group 1, communications parameters assigned to the group will override
those configured on the interface.

Calls made using BRI0 will attempt to use the authentication configured for the dial rotary, and if unsuccessful, will
use pap authentication.
The dialer profile communication parameters will override those configured directly on interface BRI0.

5 . Which command allows you to configure a physical interface to call multiple different remote locations based on the
destination IP address?
dialer map
dialer-group
dialer string
dialer interfaces

6 . What do you need to do when configuring a rotary group for outgoing calls?
Make sure the serial interfaces are set up with HDLC
Make sure that you have more locations than available interfaces
Configure dialer maps on the dialer group
Configure dialer strings on the dialer interface

7 . What command would you use to apply a rotary group to an interface?
access-group
dialer-apply
dialer rotary-group
dialer group

8 . Which three of the following router IOS commands would you use first to define "interesting" traffic using dial-on-

demand routing (DDR)?

A
B
C
D
E
F

9 . What command should you use if the same traffic that is interesting for making the call is the only traffic to be sent on
the link?
dialer-group
access-list
access-group
dialer-list

10 . Which command would you use to block routing broadcasts on an interface?
dialer-list
no routing
passive-interface
redistribute route

11 . What type of interface is created in the same fashion as a loopback interface?
map interface
string interface
dialer interface
group interface

12 . What command would you use to enable dial-on-demand routing (DDR) on any asynchronous interface?
backup interface

dialer dynamic routing
dialer in-band
dialer enable

13 . Which feature will cache routes learned by dynamic routing protocols, enabling their use over DDR connections?
Route redistribution
Dynamic static routes
Snapshot routing
DDR route maps
Passive interfaces

14 . A dialer pool is:
a group of logical interfaces
a group of physical interfaces
a group of phone numbers
a group of map classes

15 . Use the “dialer map” command at which prompt?

A
B
C
D

16 . What are the four Dialer Profile Elements?
Dialer interface
Dialer map class
Capabilities Database
Dialer pool
Physical interfaces

17 . What three profiles must be configured in order to establish a call?
System Profile
LAN Profile
Internal Profile
A User Profile
Standard Profile

18 . The simplest way to associate a phone number with an interface is to use which command?
dialer map
dialer number
dialer-list
dialer string

19 . What command will apply a single interface configuration to multiple interfaces?
dialer rotary-group
dialer group
dialer group-rotary
dialer rotary group

20 . What command would you use if you wanted to enable snapshot on a router?

A
B
C
D

21 . Examine the configuration statements. What will happen when interesting traffic destined to the network 172.16.1.0 is
seen by RouterA?

The packets destined for the 172.16.1.0 network will be dropped.
A DDR call will be placed to router RouterB and the packets routed to 10.1.1.1.
A DDR call will be placed first to router RouterB, and if it is busy,then to RouterC and RouterD.
The packets destined for the 172.16.1.0 network will be sent to the

22 . What are the four elements used by a dialer profile and associated with a dialer interface?
dialer string
dialer interface
dialer pool
dialer group
map class (optional)
Physical interfaces that make up the pool

23 . Which statement is true regarding uninteresting traffic being carried over a DDR link?
Uninteresting traffic will keep DDR call established, even if no more interesting traffic is being routed over the link.
Uninteresting traffic will be routed over an established DDR call, but at a lower priority than interesting traffic.
Uninteresting traffic will not be routed over an established DDR call.
Uninteresting traffic will be routed over an established DDR call, as long as there is enough interesting traffic to keep
the call connected.

24 . An interface may belong to only one dialer pool.