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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
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:

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

QUESTION 28:
DSL connections commonly use PPP over Ethernet (PPoE). What process does a
Certkiller 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
QUESTION 29:
Many Certkiller 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

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Feedbacks

* ”

I just came back from the exam with a score of 950 3 hours ago.

I got PPPOE simulation, 2 SDM similar in P4S, and also question 218 – 222 in P4S where it’s about site-to-site VPN which I’m curse myself for being panicked for a while( I believe i got ony 1 correct out of 5 Q). It all started before the exam when CISCO give big sign of warning that your result will be pending for their so called analysis. They also conduct online survey asking how long it takes for you to study for the exam and also mode of training which means by self study or working experience. I choose working experience instead since i’m afraid if I got high score, analysis will reveal it is impossible for candidates to pass the exam by working experience only.
”
* — Gloria (Oct, 9 2008)
* ”

I just passed it with a preliminary score of 1000. I spent 1 hour and 15 minutes.

I had the Following:

Simulator:

1. AAA Simulator, with some issues with # and login on the router, however latest config on this is correct, so don’t worry if you are not able to login on the router to verify it, as me..

Simlet:

1. 2 x SDM Simlet

2. HQ – Branch (1 – 5) VPN Tunnel, I don’t thought there were all 5 questions, however the process it the same for all of them…

3. 1x Multi Site VPN SDM

Drag & Drops:

2-3 from P4S

– PPPOE configuration of physical interface

– Hybrid-coaxial architecture, the one with Local headend, cable modem termination system, cable modem sections

– AH-ESP-IKE

Cheers
”
* — Thoms (Oct, 9 2008)
* ”

ISCW passed in the second attempt, CCNP done.

75 Questions 989/1000 (One question wrong)

1 question out of p4s

My GRE tunnel simlet was a little bit else.

one branch office router had wrong AS number 11 instead of 1

one branch office router had missing default route

the HQ router had a non correct tunnel source to one branch

HQ router had non correct tunnel destination IP for one branch office router configured

one branch office router had non correct mask for the EIGRP subnet configured

can’t remember the orde, but this doesn’t matter.

As somebody already said: Just check all the possible answers with the “show run”, “show ip int brief”, …

Thanks to all for the help!
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