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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?
Trang 2BootP 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
Trang 3Multiple 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
Trang 4This 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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