Modem Configuration Using Reverse Telnet

In order to configure a modem, a router must be set up to talk to it. Cisco refers to this as a reverse Telnet connection. A host that is connected to a router can Telnet to a Cisco reserved port address on the router and establish an 8-N-1 connection to a specific asynchronous port. An 8-N-1 connection declares the physical signaling characteristics for a line. Table 4-3 shows reserved port addresses. The router must have a valid IP address on an interface and an asynchronous port. To...

Do I Know This Already Quiz

The purpose of the Do I Know This Already quiz is to help you decide what parts of this chapter to use. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now. The fifteen-question quiz helps you determine how to spend your limited study time. The quiz is sectioned into smaller quizlets, each of which corresponds to the nine major topic headings in the chapter. Use the scoresheet in Table 11-1 to record your scores. Table 11-1 Scoresheet for...

NAT Overlapping Configuration

NAT can deal with overlapping networks, even though it is not desirable to create an overlapped network. The overlapping of networks typically occurs during a merger of two companies that are using the same private address space. The overlap configuration is put in place as a stopgap while renumbering takes place. The following configuration uses the addresses designated as Outside Global and Outside Local with reference, albeit arbitrary, to one or the other networks. One network is declared...

All About the Cisco Certified Network Professional and Design Professional Certification

How This Book Can Help You Pass the CCNP Remote Access Exam 4 Overview of Cisco Certifications 5 The Remote Access Exam and the CCNP and CCDP Certifications 6 What Is on the Remote Access Exam 9 Recommended Training Path for CCNP and CCDP 11 How to Use This Book to Pass the Exam 13 One Final Word of Advice 14 You Have Passed Other CCNP Exams and Are Preparing for the Remote Access Exam 14 Scenario 1 You Have Taken the BCRAN Course 14 Scenario 2 You Have NOT Taken the BCRAN Course 14 You Have...

Foundation Topics X25 Basics

In the 1970s, a suite of protocols was needed to provide WAN connectivity across public data networks (PDNs), which had already been deployed with great success. Standardization in the deployment of PDNs was lacking. Industry participants at the time thought that standardization would increase the number of clients who would subscribe to PDN services, if a way could be found to decrease cost while increasing functionality. The result of this development effort was the X.25 specification, which...

Foundation Summary

The Foundation Summary is a collection of tables and figures that provides a convenient review of many key concepts in this chapter. For those of you already comfortable with the topics in this chapter, this summary could help you recall a few details. For those of you who just read this chapter, this review should help solidify some key facts. For any of you doing your final preparation before the exam, these tables and figures will hopefully be a convenient way to review the day before the...

Characteristics of NAT

NAT enables nonregistered IP addresses, or the RFC 1918 private address space, to be used inside a private network and to gain access to a public network, such as the World Wide Web. The edge router connected to the public network uses NAT to translate the private network addresses to a registered public address. The translation can be statically or dynamically done. In the case of a simple translation, each nonregistered IP address is translated to a unique public address. This enables access...

The Remote Access Exam and the CCNP and CCDP Certifications

The Remote Access exam proves mastery of the features used in larger corporate dial-in facilities and Internet service provider (ISP) operations. Skills required for CCNP and CCDP certifications include the ability to install, configure, operate, and troubleshoot remote access devices in a complex WAN environment. Specifically, the remote access skills required ensure that the CCNP or CCDP candidate can ensure minimal WAN costs to the customer or client using the Cisco IOS features. The Cisco...

ISDN Switch Type

The PRI installation procedure is similar to its BRI counterpart. A service call is placed, and then the demarc is determined and extended, if necessary. The carrier provides the basic information necessary for connectivity, but it will be necessary to configure the router with the appropriate switch type. Table 6-4 shows the Cisco-supported switch types. Table 6-4 Cisco-Supported Primary Rate Switch Types AT& T 4ESS switch type for the U.S. AT& T 5ESS switch type for the U.S. Northern...

Terminal Endpoint Identifier TEIs

A terminal endpoint can be any ISDN-capable device attached to an ISDN network. The TEI is a number between 0 and 127, where 0-63 are used for static TEI assignment, 64-126 are used for dynamic assignment, and 127 is used for group assignments. (0 is used only for PRI and is discussed later.) The TEI provides the physical identifier, and the service access point identifier (SAPI) carries the logical identifier. The process of assigning TEIs differs slightly between North America and Europe. In...

Scenario 81 X25 Initial Configuration

In this scenario, you must configure the Dallas and San Jose routers for X.25 connectivity. Use Figure 8-8 to assist you in the scenarios. All necessary parameters are listed there. Use the configurations in Examples 8-6 and 8-7 to answer the questions that follow. Example 8-6 Dallas Configuration for Scenario 8-1 Example 8-6 Dallas Configuration for Scenario 8-1 Example 8-7 San Jose Configuration for Scenario 8-1 interface ethernet 0 ip address 192.168.3.1 255.255.255.0 interface serial 0...

TCP Load Distribution

NAT can be used for TCP load distribution. This works in a form that is somewhat reversed from other translations. In the other three uses of NAT, the sender uses a nonlegitimate source address in a packet destined for the outside world. In contrast, load distribution takes advantage of the NAT function by allowing a site to advertise an address but when you send a packet to the advertised address, it is rerouted to another set of addresses. Load distribution occurs, for example, when a large...

Scenario 82 Answers

1 The configurations in Examples 8-10 and 8-11 expand the configurations in Examples 86 and 8-7 to include the packet size parameters listed in Figure 8-8. Example 8-10 Dallas Configuration Including Packet Size Parameters interface ethernet 0 ip address 192.168.1.1 255.255.255.0 interface serial 0 encapuslation x25 ip address 192.168.2.1 255.255.255.0 x25 address 3102145551212 x25 map ip 192.168.2.2 3104085553434 broadcast Example 8-11 San Jose Configuration Including Packet Size Parameters...

Scenario 2 You Do Not Have a CCNA Certification

Why don't you have the certification The prerequisite for the CCNP certification is to be certified as a CCNA, so you really should pursue your CCNA certification before tackling the CCNP certification. Beginning with the Remote Access exam gives you a skewed view of what is needed for the Cisco Professional certification track. That being said, if you must pursue the certifications out of order, follow the spirit of the book. Read each chapter and then do the quiz at the front of the chapter...

Assembling and Cabling the WAN Components

The CCNP Remote Access Exam requires you to have an in-depth understanding of various WAN technologies. This chapter focuses on the cabling requirements of various technologies. Although individual WAN topologies can require specific cabling variances and Frame Relay implementations require little or no variance from implementations of High-Level Data Link Control (HDLC), the physical cabling is virtually identical. However, other technologies can have different requirements depending on the...