October 23 2009
640-802 Dumps Questions 742 to 744
QUESTION 742
Which of the following correctly describe characteristics of PPP? (Select all valid answer choices)
A. Encapsulates several different types of routing protocols.
B. Supports only IP.
C. Can be used over analog circuits.
D. Is proprietary to Cisco
E. Supports error correction.
Answer: AC
Section: IMPLEMENT AND VERIFY WAN LINKS
Explanation/Reference:
Explanation:
Characteristics of PPP:
* PPP can be used on either type of line (dial or switched lines), because data-link protocols are designed for
point-to-point environment.
* PPP uses one LCP per link and one Control Protocol for each Layer 3 protocol defined on the link. If a router
is configured for IPX, Apple Talk, and IP on a PPP serial link, the router configured for PPP encapsulation
automatically tries to bring up the appropriate control protocols for each layer 3 protocol.
Incorrect Answers:
B. PPP can be used to support any higher layer protocol, including IP, IPX, AppleTalk, etc.
D. PPP is an industry standard used in point to point data networks. The Cisco proprietary method that is
similar to PPP is HDLC.
Reference:
CCNA Self-Study CCNA ICND exam certification Guide (Cisco Press, ISBN 1-58720X) Page 309
QUESTION 743
You are preparing to create a point to point WAN by connecting a Cisco router with a Juniper router by way of
their serial links. Which one of the following commands would you use?
A. CM1(config-if)# encapsulation hdlc ansi
B. CM1(config-if)# encapsulation ppp
C. CM1(config-if)# encapsulation LAPD
D. CM1(config-if)# encapsulation frame-relay ietf
E. CM1(config)#encapsulation ppp
Answer: B
Section: IMPLEMENT AND VERIFY WAN LINKS
Explanation/Reference:
Explanation:
PPP is the best encapsulation type to use, when connecting routers of different manufacturers, because PPP
is non proprietary (unlike HDLC). PPP is an industry standard layer 2 encapsulation type that is supported by
every router manufacturer.
Incorrect Answers:
A. HDLC is a cisco proprietary method of encapsulation for connecting a point to point connection. Although
HDLC has become so popular that many other router vendors also support it, HDLC ANSI is not an option that
can be used.
C. LAPD is used as an out of band signaling protocol on connections such as ISDN. It is not a choice that can
be made in this case.
D. This would be the correct choice if the connection was a frame relay connection, instead of a leased line
connection. The ietf keyword is needed for connecting frame links to routers that are non-cisco.
E. This command needs to be placed in interface configuration mode, not in global configuration mode.
QUESTION 744
Router Certifyme1 exhibit:
Router Certifyme2 exhibit:
Referring to the command outputs from the Certifyme routers shown above , which of the following reasons
would you attribute the connectivity problem between the two routers?
A. The authentication needs to be changed to PAP for both routers.
B. The serial IP addresses of routers are not on the same subnet.
C. The username/password combination is incorrectly configured.
D. The router names are incorrectly configured.
E. None of the above
Answer: C
Section: IMPLEMENT AND VERIFY WAN LINKS
Explanation/Reference:
Explanation:
When configuring for CHAP authentication, you must enters the other router’s user name and password. In this
case on router Certifyme2 has entered incorrect router Certifyme1′s password, witch is “cisco1″ (it must be
“cisco”). As a result CHAP authentication will fail, therefore the connection establishment between the routers
will be refused.
Reference:
CCNA Self-Study CCNA ICND Exam Certification Guide Chapter 9 page 315ISBN: 1-58720x Incorrect
Answers:
A. Either PAP or CHAP can be used for these routers.
B. Although this appears to be true at first glance, the subnet mask is 255.255.248.0, and the IP addresses on
each side of the link are indeed on the same subnet.
D. The hostnames are configured correctly, but the passwords do not match.
Topic 9, CERTIFYME NETWORK, SCENARIO
Refer to the diagram of the Certifyme network below for the following 5 questions:
The Certifyme network shown above depicts how a satellite office is connected to the Internet via a single
connection. The following 5 questions will all refer to this diagram.
Topic 9, CERTIFYME NETWORK (5 questions)
Exam I
