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642-825 Exam: Implementing Secure Converged Wide Area Networks (ISCW)642-825 Exam: Implementing Secure Converged Wide Area Networks (ISCW)
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QUESTION 26:
ADSL broadband connections using the PPPoE access method typically uses which
type of user authentication method?
A. AAA authentication
B. DNIS authentication
C. Caller-ID authentication
D. PPP CHAP authentication
E. IPSec authentication
F. L2TP authentication
Answer: D
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Explanation:
Once the DSL device is installed and configured for PPPoE the encapsulation of all
traffic with PPPoE/PPP headers is performed. The default authentication mechanism for
PPPoE is Password Authentication Protocol (PAP). The user has the option to configure
Challenge Handshake Authentication Protocol (CHAP) or MS-CHAP manually.
Generally, the CHAP method is preferred and is normally used to overcome the security
limitations of PAP.
QUESTION 27:
When comparing the differences between PPPoA and PPPoE, which of the following
statements are true?
A. PPPoE does not support session authentication with an aggregation router.
B. PPPaE provides simple bridged connections for a limited number of hosts.
C. PPPoA relies on client software to provide connectivity and authentication.
D. PPPoA is routed end-to-end over ATM from the user’s PC to the aggregation router.
E. None of the above
Answer: D
Explanation:
Some key advantages of PPPoE and how they differ from PPPoA include:
* Per session authentication based on Password Authentication Protocol (PAP) or
Challenge Handshake Authentication Protocol (CHAP). This is the greatest advantage of
PPPoE as authentication overcomes the security hole in a bridging architecture.
* Per session accounting is possible, which allows the service provider to charge the
subscriber based on session time for various services offered. The service provider may
also require a minimal access charge.
* PPPoE can be used on existing CPE installations that cannot be upgraded to PPP or that
do not have the ability to run PPPoA, extending the PPP session over the bridged
Ethernet LAN to the PC.
* PPPoE preserves the point-to-point session used by Internet Service Providers (ISPs) in
the current dialup model. PPPoE is the only protocol capable of running point-to-point
over Ethernet without requiring an intermediate IP stack.
* The Network Access Provider (NAP) or Network Service Provider (NSP) can provide
secure access to a corporate gateway without managing end-to-end permanent virtual
circuits (PVCs) and making use of Layer 3 routing and/or Layer 2 Tunneling Protocol
(L2TP) tunnels. This makes the business model of selling wholesale services and virtual
private networks (VPNs) scalable.
* PPPoE can provide a host (PC) access to multiple destinations at a given time. There
can be multiple PPPoE sessions per PVC.
* The NSP can oversubscribe by deploying idle and session time-outs using an industry
standard Remote Authentication Dial-In User Service (RADIUS) server for each
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subscriber.
* PPP can be used with the service selection gateway (SSG) feature.
Some key disadvantages of PPPoE and how they differ from PPPoA include:
* PPPoE client software must be installed on all hosts (PCs) connected to the Ethernet
segment. This means that the access provider must maintain the CPE and the client
software on the PC.
* Because PPPoE implementation uses RFC1483 bridging, it is susceptible to broadcast
storms and possible denial-of-service attacks.
Reference:

http://www.cisco.com/warp/public/794/pppoe_arch.html

QUESTION 28:
DSL connections commonly use PPP over Ethernet (PPoE). What process does a
PassGuide host have to perform to establish a PPoE SESSION_ID?
A. A DHCP request process to request and IP address and session ID.
B. A Discovery process to identify a PPPoE server and request a session ID.
C. A RARP request process to request a MAC address and session ID.
D. A BOOTP process to request a configuration and session ID.
E. None of the above
Answer: B
Explanation:
When a router wants to initiate a PPPoE session, it must first perform Discovery to
identify the Ethernet MAC address of the peering device and establish a PPPoE
SESSION_ID. Discovery is inherently a client/server relationship. During Discovery, a
router discovers the provider DSLAM. Discovery allows the CPE router to discover all
available DSLAMs, and then select one. When Discovery completes successfully, both
the CPE router and the selected DSLAM have the information they will use to build their
point-to-point connection over Ethernet.
Reference:
Cisco Press – BCRAN – 642-821 – Exam Certification Guide 2004 (ISBN 1-58720-084-8)
Page 253
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QUESTION 29:
Many PassGuide remote offices use DSL for their connectivity. Which four features
are usually required for an 827 ADSL router to support a home ADSL broadband
Internet connection with multiple end-user PCs? (Choose four)
A. IPSec
B. Bridging (IRB or RBE)
C. PPPoE client
D. PAT
E. DHCP server
F. Static default route
Answer: C, D, E, F
Explanation:
In Cisco IOS(r) Software Release 12.1(3)XG, a PPP over Ethernet (PPPoE) client feature
was introduced for the Cisco 827 router. This feature allows the PPPoE functionality to
be moved to the router. Multiple PCs can be installed behind the Cisco 827. Before their
traffic is sent to the PPPoE session, it can be encrypted, filtered, and so forth. Also,
Network Address Translation (NAT) can run.
PAT is needede to be able to translate multiple internal IP addresses into one single IP
address. Since the majority of DSL connections provide only IP address, this is
necessary.
A DHCP server is normally required, so that IP addresses can be dynamically assigned to
the PC’s sharing the DSL connection.
Finally, a static default route needs to be configured on the 827 DSL router pointing out
the DSL interface, so that all traffic destined for the Internet will be forwarded out to the
DSL network.
QUESTION 30:
The following was issued on a PassGuide DSL router:
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Observe the output from the show dsl int atm 0 command shown above. What does
the display of the upstream and downstream speed indicate?
A. Layer 1 connectivity has been established
B. Layer 2 connectivity has been established
C. Layer 1 and 2 connectivity has been established
D. Layer 3 connectivity has been established
E. Layer 2 and 3 connectivity has been established
Answer: C