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Quarantine Control A remote-access feature that can be used to restrict VPN client access. Quarantine Control allows you to screen VPN client machines using a clientside script before allowing them access to the organization s network. Quarantined VPN Clients network Contains the IP addresses of all the VPN clients that have connected using VPN client access but have not yet cleared quarantine. remote-site network Contains the IP addresses of all the computers in remote sites when a site-to-site VPN connection is configured. Additional remote-site networks are created for each remote-site connection. site-to-site VPN A point-to-point secure tunnel created through the Internet between a VPN gateway server in one location and a VPN gateway server in another location. tunneling protocol Uses encryption protocols to provide data security as the data is sent across the public network. The two VPN protocols supported by ISA Server are Microsoft Point-to-Point Tunneling Protocol (PPTP) or the Layer 2 Tunneling Protocol (L2TP). virtual private network (VPN) A virtual network that enables communication between a remote-access server and computers on the internal network or between two remote sites separated by a public network such as the Internet. VPN Clients network Contains the IP addresses of all the VPN clients that have connected using VPN client access.
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Questions and Answers
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Lesson 1 Review
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1. Your company needs to support VPN clients that use Microsoft Windows 98, Windows 2000, and Windows XP to connect to ISA Server 2004. The computers are all configured with smart-card readers, and each user has been issued a smart card. What is the most secure authentication protocol that is available for these clients a. CHAP b. MS-CHAP c. MS-CHAP v2 d. EAP
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D is correct. Although you can use any of these protocols, the most secure form of authentication for these clients is Extensible Authentication Protocol because it can use the smart cards for authentication.
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2. You need to ensure that your VPN clients attempting to connect have the Windows Firewall installed and enabled. How would you accomplish this
Implement network quarantine control by enabling quarantine control and then using a script on each client to test if the client has the Windows Firewall installed and enabled. Only allow VPN access if the client has the firewall enabled.
3. You want to use L2TP/IPSec as your tunneling protocol. Some of your VPN clients are running Windows NT 4.0 Workstation. What must you do to enable L2TP/IPSec support with the least amount of effort a. Do nothing. L2TP/IPSec support is built into NT 4.0 Workstation. b. Download and install the Ms12tp.exe on the clients. c. You must upgrade the clients to Windows 2000 Professional or Windows XP. d. Install a Connection Manager package to deliver the L2TP/IPSec client.
B is correct. Download and install Ms12tp.exe. A is incorrect because L2TP/IPSec is not available in Windows NT 4.0 by default. C is incorrect because the VPN client can be installed to provide support for L2TP/IPSec so you do not have to upgrade the client to a newer operating system. D is incorrect because the Connection Manager package is used to deliver a client side script to test client configuration and cannot be used to distribute an upgraded client.
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Lesson 2 Review
1. You have deployed three different ISA Server computers and configured them to accept VPN connections. You want to log information about all connection attempts in a single log file. What is the best way to accomplish this
Questions and Answers
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Install Internet Authentication Service on a server in your domain. Then configure the ISA Server computers to Use RADIUS for Accounting (Logging) and configure them to use the IAS server. RADIUS servers allow you to log all connection information on the RADIUS server.
2. You are the network administrator for your organization. You have deployed ISA Server to accept VPN connections. You have remote-access policies in place so that only specified Windows security groups can connect to the VPN server. Users in those groups are reporting that they are unable to get a connection. The error message they receive tells them they do not have dial-in permission. The remoteaccess policies are configured correctly. What is the most likely cause of the error message How will you resolve the problem
The most likely cause is that the domain is running in mixed mode. While in mixed mode, all users dial-in permissions are set to Deny and remote-access policies are ignored. You must raise the domain level or manually configure each user s dial-in permission.
3. You have deployed ISA Server 2004. Several users within the organization travel frequently and must be able to access resources on the internal network. These resources include accessing their mailboxes through Microsoft Exchange Server by using client computers running Microsoft Office Outlook, accessing internal Web sites that contain confidential information, and accessing file shares on internal file servers. You need to enable access to these internal resources while minimizing the complexity of the client configuration as much as possible. Users should require only a user name and password to connect to internal resources. All the users should also be granted immediate access to the network after authentication. What should you do a. Configure ISA Server to support VPN client access to the internal network. Configure the VPN connection to require L2TP over IPSec. Provide the users with instructions on how to configure each of these connections. b. Configure ISA Server to support VPN client access to the internal network. Configure the VPN connection to require L2TP over IPSec. Use the Connection Manager Administration Kit to create a profile for all the remote users. c. Configure ISA Server to support quarantined VPN access to the internal network. Configure the VPN connection to require PPTP. Provide the users with instructions about how to configure each of these connections. d. Configure ISA Server to support VPN client access to the internal network. Configure the VPN connection to require PPTP. Use the Connection Manager Administration Kit to create a profile for all the remote users.
D is correct. To provide access to several internal resources while simplifying the client configuration, use a VPN. Because the users require immediate access after authentication, you cannot use a quarantine control. Point-to-Point Tunneling Protocol (PPTP) is the only protocol that requires only a user name and password because Layer Two Tunneling Protocol (L2TP) over Internet Protocol Security (IPSec) requires a certificate or pre-shared key. And to simplify the client configuration, use the Connection Manager Administration Kit (CMAK) to configure a profile for each user.
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