Removing the IPP printing capability from a server is a good countermeasure against an IIS buffer overflow attack. A Network Administrator should take the following steps to prevent a Web server from IIS buffer overflow attacks: Conduct frequent scans for server vulnerabilities. Install the upgrades of Microsoft service packs. Implement effective firewalls. Apply URLScan and IISLockdown utilities. Remove the IPP printing capability. Answer: B is incorrect. The following are the DNS zone transfer countermeasures: Do not allow DNS zone transfer using the DNS property sheet:
a. Open DNS.
b. Right-click a DNS zone and click Properties.
c. On the Zone Transfer tab, clear the Allow zone transfers check box.
Configure the master DNS server to allow zone transfers only from secondary DNS servers:
a. Open DNS.
b. Right-click a DNS zone and click Properties.
c. On the zone transfer tab, select the Allow zone transfers check box, and then do one of the following:
To allow zone transfers only to the DNS servers listed on the name servers tab, click on the Only to the servers listed on the Name Server tab. To allow zone transfers only to specific DNS servers, click Only to the following servers, and add the IP address of one or more servers. Deny all unauthorized inbound connections to TCP port 53. Implement DNS keys and encrypted DNS payloads. Answer: D is incorrect. The following are the countermeasures against SNMP enumeration:
1. Removing the SNMP agent or disabling the SNMP service
2. Changing the default PUBLIC community name when 'shutting off SNMP' is not an option
3. Implementing the Group Policy security option called Additional restrictions for anonymous connections
4. Restricting access to NULL session pipes and NULL session shares
5. Upgrading SNMP Version 1 with the latest version 6.Implementing Access control list filtering to allow only access to the read-write community from approved stations or subnets Answer: A is incorrect.
NetBIOS NULL session vulnerabilities are hard to prevent, especially if NetBIOS is needed as part of the infrastructure. One or more of the following steps can be taken to limit NetBIOS NULL session vulnerabilities: 1.Removing the SNMP agent or disabling the SNMP service 2.Changing the default PUBLIC community name when 'shutting off SNMP' is not an option 3.Implementing the Group Policy security option called Additional restrictions for anonymous connections 4.Restricting access to NULL session pipes and NULL session shares 5.Upgrading SNMP Version 1 with the latest version 6.Implementing Access control list filtering to allow only access to the read-write community from approved stations or subnets nswer option A is incorrect. NetBIOS NULL session vulnerabilities are hard to prevent, especially if NetBIOS is needed as part of the nfrastructure. One or more of the following steps can be taken to limit NetBIOS NULL session vulnerabilities:
1. Null sessions require access to the TCP 139 or TCP 445 port, which can be disabled by a Network Administrator.
2. A Network Administrator can also disable SMB services entirely on individual hosts by unbinding WINS Client TCP/IP from the interface.
3. A Network Administrator can also restrict the anonymous user by editing the registry values:
a.Open regedit32, and go to HKLM\SYSTEM\CurrentControlSet\LSA. b.Choose edit > add value. Value name: RestrictAnonymous Data Type: REG_WORD Value: 2
