CCNA 4 v3.1 Module 3 PPP
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Transcript of CCNA 4 v3.1 Module 3 PPP
1© 2004, Cisco Systems, Inc. All rights reserved.
CCNA 4 v3.1 Module 3 PPP
222© 2004, Cisco Systems, Inc. All rights reserved.
Objectives
333© 2004, Cisco Systems, Inc. All rights reserved.
Introduction to Serial Communication
Transmission system encodes bits into electrical voltage using methods like NRZ-L or AMI
Some of the many serial communications standards include the following:
RS-232-E V.35 High-Speed Serial Interface (HSSI)
444© 2004, Cisco Systems, Inc. All rights reserved.
Time-Division Multiplexing
555© 2004, Cisco Systems, Inc. All rights reserved.
Demarcation Point
The point in the network where the responsibility of the service provider or "telco" ends.
666© 2004, Cisco Systems, Inc. All rights reserved.
DTE-DCE
777© 2004, Cisco Systems, Inc. All rights reserved.
Serial Connection Options
888© 2004, Cisco Systems, Inc. All rights reserved.
DTE/DCE Interface
• The DTE/DCE interface for a particular standard defines the following specifications:
Mechanical/physical - Number of pins and connector type
Electrical - Defines voltage levels for 0 and 1
Functional - Specifies the functions that are performed by assigning meanings to each of the signaling lines in the interface
Procedural - Specifies the sequence of events for transmitting data
999© 2004, Cisco Systems, Inc. All rights reserved.
HDLC Encapsulation
101010© 2004, Cisco Systems, Inc. All rights reserved.
Configuring HDLC Encapsulation
111111© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting a Serial Interface
121212© 2004, Cisco Systems, Inc. All rights reserved.
Troubleshooting a Serial Interface
• Five possible problem states can be identified in the interface status line of the show interface serial display:
Serial x is down, line protocol is down.
Serial x is up, line protocol is down.
Serial x is up, line protocol is up (looped).
Serial x is up, line protocol is down (disabled).
Serial x is administratively down, line protocol is down.
131313© 2004, Cisco Systems, Inc. All rights reserved.
PPP Layered Architecture
141414© 2004, Cisco Systems, Inc. All rights reserved.
PPP and the Data Link Layer
151515© 2004, Cisco Systems, Inc. All rights reserved.
PPP and the Network Layer
161616© 2004, Cisco Systems, Inc. All rights reserved.
Establishing a PPP Session
171717© 2004, Cisco Systems, Inc. All rights reserved.
PPP Operation
181818© 2004, Cisco Systems, Inc. All rights reserved.
Link Control Protocol Options
191919© 2004, Cisco Systems, Inc. All rights reserved.
PPP Configuration Options
202020© 2004, Cisco Systems, Inc. All rights reserved.
Network Control Protocol
212121© 2004, Cisco Systems, Inc. All rights reserved.
PPP Authentication Protocols
222222© 2004, Cisco Systems, Inc. All rights reserved.
PPP Authentication Protocols
232323© 2004, Cisco Systems, Inc. All rights reserved.
Password Authentication Protocol (PAP)
242424© 2004, Cisco Systems, Inc. All rights reserved.
Challenge Handshake Authentication Protocol (CHAP)
CHAP provides protection against playback attack through the use of a variable challenge value that is unique and unpredictable.
252525© 2004, Cisco Systems, Inc. All rights reserved.
PPP Encapsulation and Authentication Process
262626© 2004, Cisco Systems, Inc. All rights reserved.
CHAP Authentication Process
272727© 2004, Cisco Systems, Inc. All rights reserved.
Configuring PPP
282828© 2004, Cisco Systems, Inc. All rights reserved.
Configuring PPP Authentication
292929© 2004, Cisco Systems, Inc. All rights reserved.
PAP Configuration
303030© 2004, Cisco Systems, Inc. All rights reserved.
CHAP Configuration
313131© 2004, Cisco Systems, Inc. All rights reserved.
Verifying PPP
323232© 2004, Cisco Systems, Inc. All rights reserved.
PPP Configuration Commands
333333© 2004, Cisco Systems, Inc. All rights reserved.
Debug PPP Authentication
343434© 2004, Cisco Systems, Inc. All rights reserved.
Summary