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NEW QUESTION: 1
攻撃者であるロビンは、データを盗み出すために、DNSトンネリング方式を介して組織のファイアウォールをバイパスしようとしています。彼はファイアウォールをバイパスするためにNSTXツールを使用しています。ロビンは次のどのポートでNSTXツールを実行する必要がありますか？
A. ポート80
B. ポート53
C. ポート23
D. ポート50
Answer: B
Explanation:
DNS uses Ports 53 which is almost always open on systems, firewalls, and clients to transmit DNS queries. instead of the more familiar Transmission Control Protocol (TCP) these queries use User Datagram Protocol (UDP) due to its low-latency, bandwidth and resource usage compared TCP-equivalent queries. UDP has no error or flow-control capabilities, nor does it have any integrity checking to make sure the info arrived intact. How is internet use (browsing, apps, chat etc) so reliable then? If the UDP DNS query fails (it's a best-effort protocol after all) within the first instance, most systems will retry variety of times and only after multiple failures, potentially switch to TCP before trying again; TCP is additionally used if the DNS query exceeds the restrictions of the UDP datagram size - typically 512 bytes for DNS but can depend upon system settings. Figure 1 below illustrates the essential process of how DNS operates: the client sends a question string (for example, mail.google[.]com during this case) with a particular type - typically A for a number address. I've skipped the part whereby intermediate DNS systems may need to establish where '.com' exists, before checking out where 'google[.]com' are often found, and so on.

Many worms and scanners are created to seek out and exploit systems running telnet. Given these facts, it's really no surprise that telnet is usually seen on the highest Ten Target Ports list. Several of the vulnerabilities of telnet are fixed. They require only an upgrade to the foremost current version of the telnet Daemon or OS upgrade. As is usually the case, this upgrade has not been performed on variety of devices. this might flow from to the very fact that a lot of systems administrators and users don't fully understand the risks involved using telnet. Unfortunately, the sole solution for a few of telnets vulnerabilities is to completely discontinue its use. the well-liked method of mitigating all of telnets vulnerabilities is replacing it with alternate protocols like ssh. Ssh is capable of providing many of an equivalent functions as telnet and a number of other additional services typical handled by other protocols like FTP and Xwindows. Ssh does still have several drawbacks to beat before it can completely replace telnet. it's typically only supported on newer equipment. It requires processor and memory resources to perform the info encryption and decryption. It also requires greater bandwidth than telnet thanks to the encryption of the info . This paper was written to assist clarify how dangerous the utilization of telnet are often and to supply solutions to alleviate the main known threats so as to enhance the general security of the web Once a reputation is resolved to an IP caching also helps: the resolved name-to-IP is usually cached on the local system (and possibly on intermediate DNS servers) for a period of your time . Subsequent queries for an equivalent name from an equivalent client then don't leave the local system until said cache expires. Of course, once the IP address of the remote service is understood , applications can use that information to enable other TCP-based protocols, like HTTP, to try to to their actual work, for instance ensuring internet cat GIFs are often reliably shared together with your colleagues. So, beat all, a couple of dozen extra UDP DNS queries from an organization's network would be fairly inconspicuous and will leave a malicious payload to beacon bent an adversary; commands could even be received to the requesting application for processing with little difficulty.

NEW QUESTION: 2
侵入検知システム（IDS）をレビューするIS監査人に最も関係するのは次のうちどれですか？
A. 偽陰性の数
B. IDSログの信頼性
C. システムによってブロックされた正当なトラフィック
D. 誤検知の数
Answer: D

NEW QUESTION: 3
Examine these details from the sysctl.conf file and from the proc file system:
[root@FAROUT fs]# grep aio-max-nr /etc/sysctl.conf # oracle-rdbms-server-11gR2-preinstall setting for fs.aio-mx-nr is 1048576 fs.aio-max-nr = 1048576
[root@FAROUT fs] # cat /proc/sys/fs/aio-max-nr 1048576
[root@FAROUT fs] # rpm -q libaio Libaio-0.0.107-10.e16.x86_64 Libaio-0.3.107-10.e76.i686
Which statement is true about the setting created by oracle-rdbms-server-11gR2-preinstall?
A. It allows two or more processes to request I/Os and then to both be notified when both of them complete.
B. It allows two or more processes to request I/O simultaneously while running on different CPUs.
C. It allows a process to request a single I/O without awaiting for a reply. However, if a second I/O is requested, then the process must wait.
D. It allows a process to request an I/O without waiting for reply.
Answer: B