Summary

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• ADSL provides faster downloading speed than uploading speed.

• SDSL provides exactly the same downloading and uploading speeds.

• ADSL is designed to co-exist with POTS because there is a POTS splitter at the CO.

• The trade-off between different DSL types is reach versus speed.

• The three common encapsulation methods are: RFC1483/2684 Bridging, PPPoE, and PPPoA.

© 2004 Cisco Systems, Inc. All rights reserved. BCRAN v2.1—4-13

Quiz

Use the practice items here to review what you learned in this lesson. The correct answers are found in the Quiz Answer Key.

Q1) DSL utilizes high transmission frequencies up to what limit?

Q2) Which of the following DSL variants offers symmetric speed up to 2.3 Mbps and is an ITU standard?

A) IDSL

B) ADSL

C) SDSL

D) G.SHDSL

Q3) Which DSL variant offers the highest speed but the shortest reach?

A) VDSL

B) ADSL

C) IDSL

D) SDSL

E) G.SHDSL

Q4) The typical maximum distance limit for ADSL service is_.

A) 18,000 feet

B) 22,000 feet

C) 30,000 feet

Q5) Which three of the following are ADSL modulation methods? (Choose three.)

A)

CAP

B)

DMT

C)

G.lite

D)

2B1Q

Q6) ADSL is designed to coexist with POTS because_____ .

A) the ADSL CPE combines voice and data signals

B) the DSLAM can be configured to separate the voice and data traffic

C) separate sets of transmission wires are used to transmit the voice and data traffic

D) a POTS splitter at the CO separates voice and data frequency

Q7) Which ADSL modulation method uses 250 subchannels that are 4 kHz each?

D) 2B1Q

Q8) Which three of the following are among the advantages of bridging? (Choose three.)

A) The CPE in bridge mode acts as a dumb device.

B) IP address hijacking is possible in a bridge environment.

C) Bridging architecture is easy to install because of its simple nature.

D) Bridging is very simple to understand and implement because there are no complex issues about routing, authentication requirement for users, and so forth.

Q9) With the PPPoE client software running on the end-user PC, the PPP session is established between which two devices?

A) the end-user PC and the aggregation router

B) the ADSL CPE and the aggregation router

C) the end-user PC and the ADSL CPE

D) the ADSL CPE and the DSLAM

Q10) PPPoE is specified in_.

A) RFC 2516

B) RFC 2545

C) RFC 2216

D) RFC 2534

Q11) When using PPPoE, the MTU should be set to what size?

A) 1492 bytes

B) 1500 bytes

C) 1508 bytes

D) 1518 bytes

Q12) PPP over ATM requires which two of the following: (Choose two.)

A) host-based software on the end-user PC

B) no host-based software on the end-user PC

C) the CPE to be set up as a bridge

D) the CPE to be set up as a router

Q13) With PPPoA, the PPP session is established between which two devices?

A) the end-user PC and the aggregation router

B) the ADSL CPE and the aggregation router

C) the end-user PC and the ADSL CPE

D) the ADSL CPE and the DSLAM

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