Quản trị mạng Chapter8.

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Exam questions


1 . How can an ISDN interface be used as a backup link for a primary interface and still use DDR to communicate with
other sites?
By using dialer profiles.
An ISDN interface cannot be both.
With the command backup interface serial 0/0 on the bri0/0 interface along with normal DDR commands.
With the command backup interface bri 0/0 on the physical interface and normal DDR commands on the bri0/0
interface.

2 . What command will activate a line when the primary interface reaches 80% and deactivate it when 30% is reached?
backup load 20 90
backup load 80 30
backup load 90 20
backup load 30 80

3 . You need a strict priority queuing mechanism to support the VOIP used in the HanoiCTT network. Which two queuing
methods allow for strict priority queuing of delay sensitive applications? (Choose two)
Flow-based WFQ
Class-based WFQ
LLQ
CQ
PQ

4 . What is the best description of the command “backup delay 20 30”?

When the primary link drops for 20 seconds, the backup link will be activated. When the primary link comes back
online and has been up for 30 seconds, the backup link will drop.
When the primary link drops for 20 msec, the backup link will be activated. When the primary link comes back online
and has been up for 30 msec, the backup link will drop.
When the primary link fails for 20 data tansfers, the backup link will be activated. When the primary link comes back

online and has done 30 good data transfers, the backup link will drop.
When the primary link reaches 20 MB, the backup link will be activated. When the primary link comes back online and
has reached 30 MB, the backup link will drop.

5 . You would like to use an existing ISDN line as a backup for a Frame Relay line connected on interface serial0. Which
statement is correct based on the following configuration of the Cisco Router? interface serial0 ip address 192.168.10.1
255.255.255.0 backup interface bri0 backup delay 5 10 interface bri0 ip address 192.168.11.2 255.255.255.0 dialer idle-
timeout 900 dialer-group 1 dialer-group 1 protocol ip permit
ISDN BRI line will be in "standby" mode after 900 seconds once the serial interface activates again.
ISDN BRI line will be in "standby" mode after 10 seconds once the serial interface activates again.
ISDN BRI line will be in "standby" mode after 10 seconds but will be in "standby" mode after 900 seconds once the
serial interface activates again.
ISDN BRI line will be in "standby" mode after 10 seconds but will be in "up/up" mode after 900 seconds once the
serial interface activates again.

6 . What does TCP IP header exclude in its compression scheme?
TCP/IP header
Layer 3 header
Layer 4 header
Layer 2 header

7 . Read and answer the question?

A

B
C
D

8 . The Cisco currently uses an ISDN BRI in standby mode to back up the primary serial connection. How can the BRI
interface be configured to allow dialup operation as well as backup services?
Configure the BRI as a standard DDR connection and configure the serial port to use BRI as the backup.
Configure one B channel of the BRI as Standby Backup and two B channels as DDR.
Configure one B channel of the BRI as Standby Backup and the other B channel as DDR.
Configure two B channels of the BRI as Standby Backup and the other B channel as DDR.
Use the dialer profile as a backup and configure the BRI as a member of the dialer pool.
Configure one B channel of the BRI as Standby Backup and nothing else.

9 . Read and answer the question?

A
B
C
D

10 . Read and answer the question?

A
B
C
D

11 . What are three symptoms of a congested serial line?
The connection fails at a particular time of day.
The connection has never worked.

The connectivity is intermittent.
The connection fails as load increases.
The hardware connecting the serial link failed.

12 . 18. By using Cisco hardware compression adapters, what compression options can be supported (Choose all that
apply)?
IPX advanced compression
IP payload compression V8
frame relay FRF.9 stacker compression
PPP stacker compression

13 . Which router IOS command would generate the following information line? kick in load 60% kick out load 40%
show primary
show backup
show load
show interfaces
show dialer-profile

14 . To enable TCP header compression, what command will you consider?
compress lapd set
frame-relay payload-compress
ppp compress
compress
ip tcp header-compression
compress all

15 . Your colleague at Cisco is trying to setup an ISDN line to use as a backup for his Frame Relay correction. What is true
about his configuration shown below? interface serial0 ip address 192.168.10.1 255.255.255.0 backup interface bri0 backup
delay 5 10 interface bri0 ip address 192.168.11.2 255.255.255.0 dialer idle-timeout 900 dialer-group 1 dialer-group 1
protocol ip permit

The ISDN BRI line will be in “standby” mode after 900 seconds once the serial interface activates again.
The ISDN BRI line will be in “standby” mode after 10 seconds but will be in “up/ip” mode after 900 seconds once the
serial interface activates again.
The ISDN BRI line will be in “standby” mode after 10 seconds and will be in “standby” mode after 900 seconds once
the serial interface activates again.
The ISDN BRI line will be in “standby” mode after 10 seconds once the serial interface activates again.

16 . Study the command output below: kickin load 60% kickout load 40% Which of the following commands is capable of
producing the above output?
show load
show primary
show dialer-profile
show interface
show backup

17 . Read and answer the question?

A
B
C
D

18 . Read and answer the question

A