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NEW QUESTION: 1
You are running a packet sniffer on a network and see a packet containing a long string of "0x90 0x90
0x90 0x90...." in the middle of it traveling to an x86-based machine as a target. This could be indicative of what activity being attempted?
A. A FIN scan.
B. Over-subscription of the traffic on a backbone.
C. A source quench packet.
D. A buffer overflow attack.
Answer: D
Explanation:
Explanation/Reference:
A series of the same control characters, hexadecimal code, imbedded in the string is usually an indicator of a buffer overflow attack.
The Intel x86 processors use the hexadecimal number 90 to represent NOP (no operation). Many buffer overflow attacks use long strings of control characters and this is representative of that type of attack.
A buffer overflow takes place when too much data are accepted as input to a specific process. A buffer is an allocated segment of memory. A buffer can be overflowed arbitrarily with too much data, but for it to be of any use to an attacker, the code inserted into the buffer must be of a specific length, followed up by commands the attacker wants executed. So, the purpose of a buffer overflow may be either to make a mess, by shoving arbitrary data into various memory segments, or to accomplish a specific task, by pushing into the memory segment a carefully crafted set of data that will accomplish a specific task. This task could be to open a command shell with administrative privilege or execute malicious code.
Common threats to system availability, integrity, and confidentiality include hardware failure, misuse of system privileges, buffer overflows and other memory attacks, denial of service, reverse engineering, and system hacking.
Since many vulnerabilities result from insecure design and most threats are well known, it is the responsibility of the security architect to ensure that their designs are addressing security requirements appropriately while also ensuring that the system can continue to perform its intended function.
The following answers are incorrect:
Over-subscription of the traffic on a backbone. Is incorrect because if there was Over-subscription of the traffic on a backbone, that would typically result in not being able to send or receive any packets, more commonly known as Denial of Service or DoS.
A source quench packet. This is incorrect because a source quench packet is an ICMP message that contains the internet header plus 64 bits of the original datagram.
A FIN scan. This is incorrect because a FIN scan is when a packet with the FIN flag set is sent to a specific port and the results are then analyzed.
Reference(s) used for this question:
Harris, Shon (2012-10-25). CISSP All-in-One Exam Guide, 6th Edition, Security Architecture and Design, Page 332, for people using the Kindle edition you will find it at Kindle Locations 7310-7315.
Schneiter, Andrew (2013-04-15). Official (ISC)2 Guide to the CISSP CBK, Third Edition : Security Architecture and Design (Kindle Locations 1403-1407). . Kindle Edition.
Wikipedia http://en.wikipedia.org/wiki/Port_scanner
ICMP http://security.maruhn.com/iptables-tutorial/x1078.html
Wikipedia http://en.wikipedia.org/wiki/Buffer_overflow
NEW QUESTION: 2
Your company has a domain controller that runs Windows Server 2008.
The domain controller has the backup features installed.
You need to perform a non-authoritative restore of the doman controller using an existing backup
file.
What should you do?
A. Restart the domain controller in Safe Mode and use the backup snap-in to restore critical volume
B. Restart the domain controller in Safe Mode and use wbadmin to restore critical volume
C. Restart the domain controller in Directory Services Restore Mode and use the backup snap-in to restore critical volume
D. Restart the domain controller in Directory Services Restore Mode and use wbadmin to restore critical volume
Answer: D
Explanation:
almost identical to B42
http://technet.microsoft.com/en-us/library/cc816627%28v=ws.10%29.aspx
Performing Nonauthoritative Restore of Active Directory Domain Services
A nonauthoritative restore is the method for restoring Active Directory Domain Services (AD DS) from a system state, critical-volumes, or full server backup. A nonauthoritative restore returns the domain controller to its state at the time of backup and then allows normal replication to overwrite that state with any changes that occurred after the backup was taken. After you restore AD DS from backup, the domain controller queries its replication partners. Replication partners use the standard replication protocols to update AD DS and associated information, including the SYSVOL shared folder, on the restored domain controller.
You can use a nonauthoritative restore to restore the directory service on a domain controller without reintroducing or changing objects that have been modified since the backup. The most common use of a nonauthoritative restore is to reinstate a domain controller, often after catastrophic or debilitating hardware failures. In the case of data corruption, do not use nonauthoritative restore unless you have confirmed that the problem is with AD DS.
Nonauthoritative Restore Requirements
You can perform a nonauthoritative restore from backup on a Windows Server 2008 system that is a standalone server, member server, or domain controller.
On domain controllers that are running Windows Server 2008, you can stop and restart AD DS as a service. Therefore, in Windows Server 2008, performing offline defragmentation and other database management tasks does not require restarting the domain controller in Directory Services Restore Mode (DSRM). However, you cannot perform a nonauthoritative restore after simply stopping the AD DS service in regular startup mode. You must be able to start the domain controller in Directory Services Restore Mode (DSRM). If the domain controller cannot be started in DSRM, you must first reinstall the operating system.
To perform a nonauthoritative restore, you need one of the following types of backup for your backup source:
-System state backup: Use this type of backup to restore AD DS. If you have reinstalled the operating
system, you must use a critical-volumes or full server backup. If you are restoring a system state
backup, use the wbadmin start systemstaterecovery command.
-Critical-volumes backup: A critical-volumes backup includes all data on all volumes that contain operating system and registry files, boot files, SYSVOL files, or Active Directory files. Use this type of backup if you want to restore more than the system state. To restore a critical-volumes backup, use the wbadmin start recovery command.
-Full server backup: Use this type of backup only if you cannot start the server or you do not have a system state or critical-volumes backup. A full server backup is generally larger than a critical-volumes backup. Restoring a full server backup not only rolls back data in AD DS to the time of backup, but it also rolls back all data in all other volumes. Rolling back this additional data is not necessary to achieve nonauthoritative restore of AD DS.
NEW QUESTION: 3
Ein Unternehmen möchte Wartungsarbeiten an einem seiner Webserver durchführen, ohne die Verfügbarkeit des Dienstes während eines geplanten Änderungsfensters zu beeinträchtigen. Welches der folgenden Netzwerkgeräte ist erforderlich, um diese Funktionalität bereitzustellen?
A. Router
B. Load Balancer
C. Proxy weiterleiten
D. Firewall
Answer: B