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Designing Secure Communications Between Networks
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Exercise 1: Make Recommendations for Site-to-Site Configuration
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Answer the following question. 1. What configuration would you recommend be used for site-to-site connections
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Exercise 2: Make Recommendations for Protecting Employee Communications
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Answer the following question. 1. What would you recommend to protect the communications going from remoteaccess employees back to the employees offices
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VPN protocol selection depends on:
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The computer operating system and the organization s willingness to add cli ent software. The requirements for security level and speed of implementation. The existing certificate infrastructure or the ability to acquire one.
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VPN network infrastructure must be considered in the development of technical solutions. Particular attention must be paid to firewall and NAT server location and configuration. Network Access Quarantine Control can provide additional protection for networks that are remotely accessed. Trust infrastructure must support proposed VPN connections when certificates are required.
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Summary and Exam Highlights
7-59
Exam Highlights
Before taking the exam, review these key points and terms. You need to know this information.
Key Points
Regardless of whether the VPN server is located behind the firewall or in front of it, you should configure the firewall to open only the required ports and configure the VPN server to protect itself by allowing only VPN traffic on its external network interface. Know which ports are required for VPN protocol access through the firewall. You configure remote access account lockout by using the registry. This has no relationship to Account Lockout in the Group Policy Account Policy settings. NAT-T solutions for client VPN software are available for Windows client com puter software, including Windows 98 second edition, Windows 2000, Windows XP Professional, and Windows Server 2003.
Key Terms
Compulsory tunnel A tunnel that is created to transport data between two VPN routers in a site-to-site demand-dial configuration. If no other route exists for transporting traffic from one site to another, this tunnel will be used and is therefore considered compulsory. Remote access VPN A type of VPN that consists of a client and server connection that is tunneled and encrypted. The client initiates the connection and must have VPN client software and VPN protocols installed. Site-to-site VPN A type of VPN that can be established between two VPN servers that have been configured with a demand-dial interface. A connection is made when a computer communication requires routing through the VPN server from one site to the other. The communication from the client is not encrypted, and this sce nario does not require VPN client software, nor does it require that VPN protocols be installed on the client. Split-tunnel When a VPN tunnel is created between a client and a server, the default Microsoft VPN configuration prevents the client from accessing other networks, such as the Internet. A split-tunnel is a tunnel in which access of other networks is allowed. Voluntary tunnel The tunnel created when a client initiates a VPN connection with the remote access server. Because the client must initiate the connection, the tun nel is considered to be voluntary.
7-60
7
Designing Secure Communications Between Networks
Questions and Answers
Pg 7-11
Lesson 1
Practice: Selecting VPN Protocols
The following table provides the answers:
Table
Selecting VPN Protocols Answer Key
Which VPN protocol should be used in this scenario
PPTP
IPSec tunnel mode
PPTP
Scenarios The VPN server sits behind a NAT box. Clients must connect to a device that is not compatible with the Microsoft L2TP/IPSec VPN. The VPN server must operate in an environment where there is no public key infrastructure and where it serves 1000 clients. Windows 98 second edition, Windows NT 4.0, and Windows 2000 Professional clients must be able to use the VPN. There is concern about the use of password-cracking software on captured VPN packets. 3DES is required for encryption.
Pg 7-25
Users must be able to use smart cards for authentication. PPTP or L2TP/IPSec
PPTP or L2TP
L2TP/IPSec L2TP/IPSec
Lesson 2
Practice: Designing a Remote Access Server VPN
1. What VPN protocol will you select
L2TP/IPSec
2. What authentication choices will you allow
Smart cards
3. What encryption strength will you require
Strongest. For L2TP/IPSec, this is 3DES.
4. What are the certificate requirements of this design
Computer and user certificates must be used.
5. What type of certificate infrastructure is required, and how will certificates be deployed
A CA hierarchy configured to automatically issue and distribute computer and user certificates must be used.
Questions and Answers
Pg 7-49
7-61
Lesson 3
Exercise 1: Choosing a VPN Protocol
Answer the following questions. 1. Which VPN protocol will you use
PPTP
2. Why did you choose this VPN protocol
There is limited time to set up the VPN, and PPTP is less complicated. It does not require cer tificates. In addition, once a successful VPN is established, certificates can be obtained and the L2TP/IPSec VPN can be configured.
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