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Objective 3.2
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Plan Security for Remote Access Users
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Objective 3.2 Questions 1.
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Which of the following authentication protocols requires you to modify the way that Active Directory encrypts user passwords
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A. PAP B. CHAP C. MS-CHAP D. MS-CHAP v2
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You are a network administrator designing a remote access security strategy for your company. You want users accessing the network with VPN connections to be able to connect to the server during business hours only, and you intend to require that users authenticate themselves using smart cards. To accomplish these goals, you configure RRAS to use the MS-CHAP v2 authentication protocol and you create a remote access policy with a condition specifying the hours during which the users can connect. Spec ify which of the stated goals are accomplished by this solution.
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A. This solution can accomplish neither of the stated goals: it will neither limit the
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users logon hours nor enable smart card authentication.
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B. This solution accomplishes only one of the stated goals: it will not limit the users
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logon hours, but it will enable smart card authentication.
C. This solution accomplishes only one of the stated goals: it will limit the users
logon hours, but it will not enable smart card authentication.
D. This solution accomplishes both stated goals: it will limit the users logon hours
and enable smart card authentication.
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16
Planning, Implementing, and Maintaining Routing and Remote Access (3.0)
Which of the following Windows Server 2003 remote access configurations would enable an attacker running Network Monitor to read user passwords from captured packets in unencrypted form
A. You configure RRAS to use CHAP for its authentication protocol and enable the
Store Password Using Reversible Encryption password policy for all remote access users.
B. You configure RRAS to use PAP for its authentication protocol, and issue a smart
card to each user.
C. You configure the Allow Remote Systems To Connect Without Authentication
option on the RRAS server, and create a remote policy with a profile specifying the use of the strongest encryption method available.
D. You configure RRAS to use MS-CHAP for its authentication protocol and set up the
callback options so the server reconnects to the client at a predetermined tele phone number.
Which of the following procedures can you use to limit client access to a remote access server based on group membership
A. Modify the properties of the clients user objects in the Active Directory Users And
Computers console.
B. Configure RRAS to use the EAP authentication protocol in the Routing And Remote
Access console.
C. Configure RRAS to use a RADIUS server to authenticate incoming client connec
tions.
D. Use the Routing And Remote Access console to create a remote access policy.
Objective 3.2
Plan Security for Remote Access Users
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Objective 3.2 Answers 1.
Correct Answers: B
A. Incorrect: The Password Authentication Protocol transmits passwords in clear
text, so it has no encryption requirements.
B. Correct: The Challenge Handshake Authentication Protocol requires access to
the users passwords, and by default, Windows Server 2003 does not store the passwords in a form that CHAP can use. To authenticate users with CHAP, you must open the group policy governing the users and enable the Store Password Using Reversible Encryption password policy mechanism.
C. Incorrect: Version 1 of the Microsoft Challenge Handshake Authentication Proto
col uses one-way authentication and a single encryption key for transmitted and received messages, but it requires no modification of Active Directory s password storage method.
D. Incorrect: Version 2 of the Microsoft Challenge Handshake Authentication Proto
col enables clients and servers to mutually authenticate each other using encrypted passwords, but requires no modification to Active Directory.
Correct Answers: C
A. Incorrect: You can successfully limit remote access users logon hours using a
remote access policy, so the solution does accomplish one of the stated goals.
B. Incorrect: Remote access policies can limit users logon hours, but the MS-CHAP
v2 authentication protocol does not support smart cards.
C. Correct: The remote access policy can limit users logon hours, but to enable
smart card authentication, you must use the Extensible Authentication Protocol (EAP).
D. Incorrect: While the solution can successfully limit users logon hours, you
cannot authenticate users with smart cards using MS-CHAP v2.
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16
Planning, Implementing, and Maintaining Routing and Remote Access (3.0)
Correct Answers: B
A. Incorrect: Storing passwords using a reversible encryption method, as required
for the Challenge Handshake Authentication Protocol, does not alter the fact that the passwords are encrypted when the clients transmit them over the remote access connection. An attacker capturing the packets using Network Monitor would not be able to read the encrypted passwords.
B. Correct: The Password Authentication Protocol transmits user passwords in clear
text, so that anyone capturing the packets with a protocol analyzer such as Network Monitor would be able to read the passwords.
C. Incorrect: Although enabling the Allow Remote Systems To Connect Without
Authentication option is a grave security risk, there is no danger of passwords being compromised, because the clients do not transmit any passwords at all.
D. Incorrect: The Microsoft Challenge Handshake Authentication Protocol always
transmits passwords in encrypted form, so there is no danger of passwords being compromised by Network Monitor, regardless of the callback options in effect.
Correct Answers: D
A. Incorrect: You can grant or deny users remote access and set caller ID and call-
back options by modifying the properties of user objects, but you cannot limit their access based on group membership.
B. Incorrect: Authentication protocols do not limit users access based on group
memberships or any other criteria. They simply specify the format for the message exchanges that the clients and server will use when authenticating.
C. Incorrect: Using RADIUS offloads the authentication process from the RRAS
service to an external RADIUS service, but RRAS is still responsible for server access control.
D. Correct: Remote access policies enable you to limit user access based on group
memberships, day and time restrictions, and various other criteria.
Objective 3.3
Implement Secure Access Between Private Networks
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Objective 3.3
Implement Secure Access
Between Private Networks
The Routing and Remote Access service in Windows Server 2003 can route traffic between networks at remote locations, using a wide area networking (WAN) link. To do this, you must connect the two sites using any functional WAN technology, such as a dial-up telephone line, leased line, or VPN, and install a router at each site to connect the private network to the WAN. However, one of the problems in implementing a connection between private networks is securing the traffic passing over the WAN link. Depending on the nature of the WAN technology you choose and the sensitivity of your data, you might choose to encrypt the traffic passing between the networks. To do this with routers running Windows Server 2003, you use the IP Security extensions (IPSec). IPSec is a set of extensions to the Internet Protocol (IP) that enable systems to digitally sign and encrypt data before it is transmitted over the network. With the transmitted data protected in this way, attackers capturing packets cannot read the information inside, nor can they modify the contents of the packet without the modifications being detected by the recipient. To define when and how computers running Windows Server 2003 use IPSec, you use IPSec policies, which you manage using the IP Security Policies snap-in for Microsoft Management Console (MMC). Windows Server 2003 has three default IPSec policies, which are as follows:
Client (Respond Only) Configures the computer to use IPSec only when another computer requests its use. The computer using this policy never initiates an IPSec negotiation; it only responds to requests from other computers for secured communications. Secure Server (Require Security) Configures the computer to require IPSec security for all communications. If the computer attempts to communicate with another computer and discovers that it does not support IPSec, the computer ter minates the connection. Server (Request Security) Configures the computer to request the use of IPSec when communicating with another computer. If the other computer supports IPSec, the IPSec negotiation begins. If the other computer does not support IPSec, the systems establish a standard, unsecured IP connection.
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