CCNA EXPLORATION
ACCESSING THE WAN
Study Guide
Chapter 2: PPP
2.0.1 What is PPP?
A LAN-to-WAN point-to-point connection is
also referred to as a ________
or,___________ because the lines are leased
from a carrier (usually a telephone company)
and are dedicated for use by the company
leasing the lines.
2.1.1 Describe Serial and Parallel communication.
What if any are the benefits of serial vs.
parallel communication?
Describe the three key serial communication
standards affecting LAN-to-WAN
connections.
2.1.2 Describe TDM.
Describe the principle used in synchronous
TDM.
What is the purpose of the MUX?
What is a data stream?
What is Statistical Time Division
Multiplexing?
What are examples of technology that uses
synchronous TDM?
What is a DSO?
What is the T-Carrier Hierarchy?
2.1.3 What is a demarcation point?
2.1.4 Describe the functions of the DTE &DCE.
The DTE/DCE interface for a particular
standard defines what specifications?
What is a null modem?
What is a DB-60 connector?
What is a smart serial connector?
When using a null modem to connect 2
routers what must be configured on the
routers?
What is UART?
2.1.5 The more common WAN protocols and
where they are used.
Describe HDLC in more detail.
CCNA EXP 4
CH.2 PPP
REVISED FEB 2009
HDLC defines three types of frames, each
with a different control field format. Describe
the fields.
2.1.6 When do you use HDLCc vs. PPP
What are the two steps to enable HDLC
encapsulation?
2.1.7 How can you tell if HDLC is configured?
The show interface serial command returns
one of five possible states. What are they?
How is the show controllers command
useful?
When using the show controllers command
how can you tell if a cable is disconnected?
What might be some other possible
problems?
2.2.1 What are some advantages of PPP vs. HDLC?
What are the three main components of
PPP?
2.2.2 On what types of interfaces can you
configure PPP?
At what layer is this considered?
How does PPP operate at the data link and
Network layers?
Describe LCP.
Describe NCP.
2.2.3 List the PPP Frame Fields
2.2.4 Describe the 3 phases of establishing a PPP
session.
Once established, how is a link terminated?
2.2.5 What functions does the LCP perform?
What are the three classes of LCP frames?
When are NCP packets exchanged?
Describe the Link establishment process.
What types of messages can LCP use during
the maintenance phase?
When & how is the link terminated?
Describe an LCP packet.
What options can PPP can be configured to
support?
2.2.6 How does the NCP packet format differ from
that of LCP?
How does NCP perform its process?
What is IPCP?
IPCP negotiates what two options?
What happens when the NCP process is
complete?
2.3.1 PPP may include what LCP options?
How do you configure a router to act as a
callback client or server?
CCNA EXP 4
CH.2 PPP
REVISED FEB 2009
2.3.2 How do you enable PPP encapsulation on
serial interface 0/0/0?
What must also be configured on a router to
use PPP?
What are the commands to configure
compression over PPP?
What command on the router ensures that
the link meets the quality requirement you
set?
What happens if the link quality percentage
is not maintained?
_________ implements a time lag so that the
link does not bounce up and down.
What is MPPP?
What are the commands to enable load
balancing across multiple links?
2.3.3 What commands verifies the proper
configuration of PPP?
What other commands may be helpful in
verifying PPP?
2.3.4 What are some of the arguments that can be
used with the debug ppp command?
Describe the usage of the various arguments
or parameters listed in the above answer.
2.4.1 Describe the PAP Authentication Protocol.
When can authentication be used?
2.4.2 Describe the PAP authentication process.
How are passwords sent using PAP?
In what circumstances is PAP acceptable?
2.4.3 How does CHAP differ from PAP?
2.4.4 Describe the CHAP authentication process.
What happens if the authentication failed?
2.4.5 Can both PAP & CHAP be enabled at the
same time on the same router?
How is the answer above configured?
After authentication has been enabled, the
local router requires the remote device to
prove its identity before allowing data traffic
to flow. How is this done?
What is an AAA/TACACS device?
How are the u/n & p/w configured for
authentication?
2.4.6 What are the code values in the output of the
debug ppp authentication command?
CCNA EXP 4
CH.2 PPP
REVISED FEB 2009