Quản trị mạng Chapter4

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Exam questions


1 . Which of the following are true regarding ISDN (Integrated Services Digital Network)? Choose two.
ISDN normally runs by means of a microwave network.
ISDN will only permit voice and graphics to be transmitted.
ISDN involves the digitization of the telephone network, which allows source material such as voice, data, video, and
graphics to be transmitted over existing telephone wires.
ISDN components include terminal adapters (TA), terminals, line termination equipment, network termination devices,
and exchange termination equipment.

2 . What are the three complete and correct options for the “dialer map” command?

A
B
C
D
E
F

3 . What routing protocols are supported by Snapshot routing?
IGRP
OSPF
EIGRP
RIP
BGP

4 . 13. In North America, the service provider supplies the NT1. In Europe, the customer supplies it.
True
False

5 . ISDN provides for what technology applications? Choose three.
voice
data
IEEE 4.2
frame relay
video

6 . Which of the following are ISDN (Integrated Services Digital Network) reference points? Choose four.
W
R
S
T
U
V

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

8 . What are the two types of ISDN (Integrated Services Digital Network) Network Termination devices? Choose two.
WT1
NT2

WT0
NT1

9 . Which two commands would be useful to troubleshoot ISDN Layer 3?
debug isdn q931
debug isdn network
debug isdn q921
debug isdn event

10 . When a T1 link is configured for B8ZS, what is the maximum bandwidth of a DS0?
64 Kbps
33.6 Kbps
64 Mbps
56 Kbps

11 . The “S” in the ISDN “S” Reference Point stands for:
Subscriber
Standard
Service
System

12 . What are the two types of ISDN (Integrated Services Digital Network) terminals? Choose two.
TE1
SE1
SE2
TE2

13 . Which one of the following ranges is the Valid Dynamic TE1 value assignment range for an ISDN BRI circuit?
1-24
25-62

64-126
128-256

14 . B8ZS (Bipolar 8 Zero Substitution) allows for:
An 8-bit string of all 0’s to be replaced by a substitute byte with three bipolar violations
Clear Channel Signaling
Bit Surfing
Data throughput of only 56 Kbps

15 . Which is the switch type for Europe?
Basic-5ess
Pri-5ess
ISDN-3SC
Basic-net3

16 . Multilink PPP (MPPP) can only be configured on individual BRI interfaces.
True
False

17 . Which two of the following terminals can be connected to an ISDN line?
TO2
TE1
TE2/TA
NU1

18 . What are Q.921 and Q.931? Choose two.
Q.921 is the layer 2 framing protocol used for the D channel data
Q.921 is the layer 2 framing protocol used for the B channels
Q.931 is the layer 3 protocol used for the D channel
Q.931 is the layer 3 protocol used for the B channels

19 . ISDN protocols that begin with "E" deal with: Choose two.
International Telephone Numbering Plan
International ISDN addressing
Concepts, structures and terminology
User Network Interface (UNI)
LAPD

20 . Given the configuration: access-list 101 permit ip any any access-list 101 deny tcp any any eq ftp dialer-list 2 protocol
ip list 101 Which two statements about the configuration are true with respect to FTP traffic and DDR?
FTP traffic will be forwarded.
FTP traffic will not be forwarded.
FTP will cause the line to come up.
Since FTP uses two sockets, both must be defined to prevent packet forwarding.

21 . What command would you use to show only the D channel information on the BRI 0 interface?
show interface bri 0 1 2
debug bri0
debug bri 0 1 2
show interface bri 0

22 . Select the correctly matching ISDN reference points and their respective interfaces.
R = Interface between TE2 and TA
S = Interface between TE1 and NT2
T = Interface between NT1 and NT2
U = Interface between NT1 and ISDN network
All of the above are correct

23 . On the ISDN BRI, framing and synchronization use:
8 Kbps

16 Kbps
48 Kbps
64 Kbps

24 . How many SPID’s (Service Profile Identifiers) should you have for each ISDN B channel?
1
2
3
4

25 . What is the layer 3 protocol for the D channel?
Q.921
DSS1
I.430
LAPD

26 . Which of the following would be a choice regarding framing for PRI T1's?