Review and Test Yourself


The following sections provide you with the opportunity to review what you learned in this chapter and to test yourself.

The Facts

For the exam, don't forget these important concepts:

  • BRI ISDN uses 2 B channels of 64Kbps each.

  • PRI ISDN uses 23 B channels offering up to 1.5Mbps transfer rates.

  • T1 lines offer transmission speeds of up to 1.544Mbps, but are more costly than an ISDN solution.

  • T3 lines offer transmission speeds of 44.736Mbps.

  • T-carrier lines are used to create point-to-point network connections for private networks.

  • FDDI can use a dual-ring configuration for fault tolerance.

  • FDDI uses a token-passing media-access method.

  • X-25 is restricted to transmission rates of 56Kbps or 64Kbps with digital implementations.

  • SONET can transfer speeds of 51.8Mbps to 2.4Gbps.

  • When a connection is made to the RAS server, the client is authenticated and the system that is dialing in becomes a part of the network.

  • RAS supports remote connectivity from all the major client operating systems.

  • Although the system is called RAS, the underlying technologies that enable the RAS process are dial-up protocols such as PPP and SLIP.

  • SLIP also does not provide error checking or packet addressing, so it can be used only in serial communications.

  • PPP provides a number of security enhancements compared to SLIPthe most important being the encryption of usernames and passwords during the authentication process.

  • Windows 2000/XP clients natively support SLIP and PPP.

  • The RDP protocol allows client systems to access and run applications on a server, using the resources of the server, with only the user interface, keystrokes, and mouse movement being transferred between the client and server computers.

  • IPSec is designed to encrypt data during communication between two computers.

  • IPSec operates at the network layer of the OSI model and provides security for protocols that operate at higher layers of the OSI model.

  • L2TP operates at the data-link layer, making it protocol independent.

  • SSL is a security protocol that is used on the Internet.

  • Secure websites begin with https:// instead of the http://. Hypertext Transfer Protocol over SSL (HTTPS) connections require a browser to establish a secure connection.

  • Secure SSL connections for web pages are made through port 443 by default.

  • WEP was the original wireless security standard. WEP encryption techniques were found to be weak, and commonly found utilities were capable of cracking the encryption.

  • WPA was introduced to address the shortcomings of WEP and offered increased encryption strength and authentication.

  • 802.1x is used by wireless networks to increase security using port controlled access.

  • Kerberos provides a method to verify the identity of a computer system over an insecure network connection.

  • The security tokens used in Kerberos are known as tickets.

Key Terms

  • PSTN

  • Modem

  • ISDN

  • BRI

  • PRI

  • T-carrier

  • T1/E1

  • T3/E3

  • FDDI

  • X.25

  • SONET/OC-x

  • RAS

  • SLIP

  • PPP

  • CHAP

  • MS-CHAP

  • PAP

  • EAP

  • SPAP

  • PPTP

  • RDP

  • Security protocol

  • Encryption

  • IPSec

  • L2TP

  • SSL

  • Kerberos

  • VPN

  • Tickets

Exam Prep Questions

1:

Which of the following dial-up protocols can use multiple LAN protocols over a link?

  • A. PPP

  • B. SLIP

  • C. IPX/SPX

  • D. UDP/TCP

2:

Which of the following protocols is used with HTTPS?

  • A. SSH

  • B. SSL

  • C. Proxy

  • D. IPSec

3:

What is the total bandwidth available when combining all BRI ISDN communication channels?

  • A. 128Kbps

  • B. 64Kbps

  • C. 96Kbps

  • D. 1,544Kbps

4:

As a remote user, you need to access your company's private network through the Internet. Which of the following protocols can you use to establish a secure connection?

  • A. IPX/SPX

  • B. TCP/IP

  • C. PPP

  • D. PPTP

5:

Which of the following is an advantage of ISDN over PSTN?

  • A. ISDN is more reliable.

  • B. ISDN is cheaper.

  • C. ISDN is faster.

  • D. ISDN uses fixed-length packets called cells.

6:

Which of the following technologies is associated with dial-up access type?

  • A. FDDI

  • B. ISDN

  • C. Packet switching

  • D. OCx

7:

Your company wants to create a secure tunnel between two networks over the Internet. Which of the following protocols would you use to do this?

  • A. IPX

  • B. CHAP

  • C. PPTP

  • D. SLIP

8:

Which of the following protocols is used in thin-client computing?

  • A. RDP

  • B. PPP

  • C. PPTP

  • D. RAS

9:

Which of the following URLs is using SSL?

  • A. http:ssl//www.comptia.org

  • B. http://www.comptia.org

  • C. httpssl://www.comptia.org

  • D. https://www.comptia.org

10:

Which of the following statements best describes the function of a PPP?

  • A. It is a secure technology that allows information to be securely downloaded from a website.

  • B. It is a dial-up protocol used over serial links.

  • C. It is a technology that allows a secure tunnel to be created through a public network.

  • D. It provides a public key/private key exchange mechanism.

Answers to Exam Prep Questions

A1:

The correct answer is A. The PPP protocol can use multiple LAN protocols such as IPX/SPX, TCP/IP, or NetBEUI.

A2:

The correct answer is B. HTTPS uses SSL to create secure connections over the Internet. Answer A is incorrect as SSH provides a secure multiplatform replacement for Telnet. Answer C is not valid, and IPSec is designed to encrypt data during communication between two computers.

A3:

The correct answer is A. BRI ISDN uses two 64Kbps channels that, when combined, offer 128Mbps transfer speeds. None of the other options are valid.

A4:

The correct answer is D. PPTP is used to establish a secure transmission tunnel over an insecure public network such as the Internet. The other protocols mentioned do not provide secure transmissions over a public network.

A5:

The correct answer is C. One clear advantage that ISDN has over the PSTN is its speed. ISDN can combine 64Kbps channels for faster transmission speeds than the PSTN can provide. ISDN is no more or less reliable than the PSTN. ISDN is more expensive than the PSTN. Answer D describes ATM, not ISDN, thus it is not a valid answer.

A6:

The correct answer is B. ISDN establishes dial-up connections to initiate the communication session. The other answers are not valid.

A7:

The correct answer is C. To establish the VPN connection between the two networks, you can use PPTP. IPX is a part of the IPX/SPX protocol suite and associated with NetWare networks. CHAP is not used to create a point-to-point tunnel; it is a authentication protocol. SLIP is not a secure dial-up protocol.

A8:

The correct answer is A. The RDP protocol is used in thin-client networking, where only screen, keyboard, and mouse inputs are sent across the line. PPP is a dial-up protocol used over serial links. PPTP is a technology used in VPNs, and RAS is a remote access service.

A9:

The correct answer is D. You can identify when SSL is used by the s in the URL (in this case, https://www.comptia.org). Answer B is a valid HTTP URL, but it is not secure. None of the other answers are correct.

A10:

The correct answer is B. PPP is a protocol that can be used for dial-up connections over serial links. Answer A describes SSL; answer C describes a VPN, and answer D describes PKI.



    Network+ Exam Cram 2
    Network+ Exam Cram 2
    ISBN: 078974905X
    EAN: N/A
    Year: 2003
    Pages: 194

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