Quản trị mạng Chapter12

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1 . Which of the following are true regarding xDSL? Choose three.
It uses a portion of the existing phone line
It is symmetrical
It requires a user to connect when wanting to use the Internet
It is asymmetrical

2 . What’s true about the G.Lite (G.922) ADSL ITU standard?
It offers equal bandwidth for upstream and downstream data traffic.
It has limited operating range of less than 4,500 feet.
It was developed specifically for the consumer market segment requiring higher download speeds.
Signals cannot be carried on the same wire as POTS signals.
All of the above

3 . Certain physical factors are capable of severely limiting the maximum speed available on a DSL connection. Which of the following
describe the factors that are capable of it? (Choose all that apply)
Number of telephones attached to the local loop.
Gauge of wire used on the local loop.
Distance between the CPE and the DSLAM.
Bridge taps in the local loop.
Loading coils in the subscriber’s line.

4 . Which two statements are true about DSL? (Choose two)

SDSL and POTS can work together.
It uses the unused bandwidth of your existing phone line.
Bandwidth is shared among users in the same geographical area.
It has a maximum distance limitation of 18,000 feet from the CO.

5 . When using PPPoE to communicate over a DSL service connection, which process must be performed by the host to establish a
PPPoE Session-ID?

BootP process to request a configuration and session ID.
Discovery process to identify a PPPoE server and request a session
DHCP request process to request and IP address and session ID.
RARP request process to request a MAC address and session ID.

6 . DSL connections commonly use PPP over Ethernet (PPoE). What process does a HanoiCTT host have to perform to establish a
PPoE SESSION_ID?
A DHCP request process to request and IP address and session ID.
A Discovery process to identify a PPPoE server and request a session ID.
A RARP request process to request a MAC address and session ID.
A BOOTP process to request a configuration and session ID.
None of the above

7 . Over which of the following DSL services is the foundation that Cisco’s Long Reach Ethernet (LRE) is based on?
ADSL
HDSL
IDSL
VDSL

8 . A new ADSL line is being installed in the home office of the HanoiCTT administrator. What best describes ADSL?
Equal upload and downloads speeds.
Slow upload, fast download speeds.

An ISDN line with no D channel.
Used as a T-1 replacement.

9 . Which statement is true regarding the ADSL (G.Lite G.922.2) standard?
Signals cannot be carried on the same wire as POTS signals.
It offers equal bandwidth for upstream and downstream data traffic.
It was developed specifically for the consumer market segment requiring higher download speeds.
It has limited operating range of less than 4,500 feet.

10 . How does xDSL achieve such a high data rate over the phone lines?
Digital data is not converted back to analog at the service provider
xDSL uses higher frequencies for data transmissions
Statistical multiplexing is used
Multiple phone lines are always used

11 . Which two physical factors can reduce the maximum speed available on a DSL connection?
Lack of loading coils and the subscriber's line.
Distance from the CPE to the DSLAM.
Gauge of wire used on the local loop.
Number of telephones attached to the local loop.
Lack of bridge taps in the local loop.

12 . An Internet Service Provider is offering ADSL connections to its customers, providing 640 kbps upload and 4 Mbps download
speeds. Which customers would benefit from this type of connection? Choose two.
Small home offices requiring 24 hour connection to the Internet for email and web communication.
Web services companies providing dynamic web content serving, including video-on-demand.
Central data processing facilities receiving simultaneous uploads of data from remote offices.
Support organizations providing ftp services for software distribution and documentation.

13 . The configuration of the 827 ADSL router depends on tbe encapsulation method used for the ADSL connection. What are the

three common encapsulation methods? (Choose three)
PPPoE
PPPoA
HDLC over ATM
DOCSIS
RFC 1483 Bridged
IP over ATM

14 . Which ADSL modulation type: • is prominent in residential applications • has 120 subchannels • doesn’t need a splitter • has a 1.5
Mbps maximum downstream speed?
CAP
DMT
G.Lite
PPPoA
PPPoE

15 . Router LabA is configured as shown below: interface ATM0/0 no ip address pvc 8/35 encapsulation aaa15mux ppp dialer dialer
pool-member 1 interface dialer 0 ip address negotiated encapsulation ppp dialer pool 1 no cdp enable ppp chap hostname testking
ppp chap password testking Given the above configuration, which statement is true?
This device is configured as a PPPoE client.
This device is configured as a PPPoA client.
This device is configured as RFC 1483/2684 bridge.
This device is configured an an aggregation router.

16 . Which proprietary DSL encapsulation type has the potential of dividing telephone lines into three widely separated, distinct
channels for the sake of minimizing interference between voice, upstream and downstream data flows?
G.Lite
CAP
DMT
Half-rate DMT

17 . When designing an ADSL network; if you want minimal local loop impairments, what should be the maximum distance of your
lines?
1000 feet (0.3 km)
4000 feet (1,5 km)
12,000 feet (3.65 km)
18,000 feet (5,5 km)
28,000 feet (8.52 km)

18 . A local Internet Service Provider is going to start offering ADSL with 640 kbps upload speed and 4Mbps download speeds. They
have retained you to help in their advertisement campaign to help them find their target market. What groups of users should you
target your marketing efforts to? (Choose two)
Central data processing facilities receiving simultaneous uploads of data from remote offices.
Support organizations providing ftp services for software distribution and documentation.
Small home offices requiring 24 hour connection to the Internet for email and web communication.
Web services companies providing dynamic web content serving, including video-ondemand.

19 . When comparing the differences between PPPoA and PPPoE, which of the following statements are true?
PPPoE does not support session authentication with an aggregation router.
PPPaE provides simple bridged connections for a limited number of hosts.
PPPoA relies on client software to provide connectivity and authentication.
PPPoA is routed end-to-end over ATM from the user's PC to the aggregation router.
None of the above

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