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NEW QUESTION: 1



A. cat: cannot open file1Hello, world
B. Hello, world
C. cat: cannot open file1
D. cat: cannot open file1 Hello, World
E. bash: syntax error near unexpected token '&&'
Answer: C
Explanation:
First line (rm file1) deletes/removes file1.
Second line captures the text into file2.
The first part of line 3 (cat file1) fails as the file1 does not exist.
The && (AND) operator will ensure that the third line fails. The result of line 3 will be the result of first part of line 3 (cat file1).
Note: cat - concatenate files and print on the standard output
Note #1: A list is a sequence of one or more pipelines separated by one of the operators ';',
'&', '&&', or '||', and optionally terminated by one of ';', '&', or a newline.
Of these list operators, '&&' and '||' have equal precedence, followed by ';' and '&', which have equal precedence.
AND and OR lists are sequences of one or more pipelines separated by the control operators '&&' and '||', respectively. AND and OR lists are executed with left associativity.
An AND list has the form
command1 && command2
command2 is executed if, and only if, command1 returns an exit status of zero.
An OR list has the form
command1 || command2
command2 is executed if, and only if, command1 returns a non-zero exit status.
The return status of AND and OR lists is the exit status of the last command executed in the list.
Note #2 (on exit status): Zero means command executed successfully, if exit status returns non-zero value then your command failed to execute.

NEW QUESTION: 2
Which of the following is most important for an auditor to convey at an initial audit interview?
A. A personal approach to information gathering
B. A give-and-take atmosphere that focuses on compromise
C. A formal approach that is guided by specific roles for each participant
D. An interest in cooperation and open dialogue
Answer: D

NEW QUESTION: 3
Andrewは、特定のターゲットネットワークのIPv4範囲内の制限付きファイアウォールによって隠されているすべてのアクティブなデバイスを検出するタスクを割り当てられた倫理的ハッカーです。
特定のタスクを実行するために、次のホスト検出手法のどれを使用する必要がありますか？
A. arpingスキャン
B. TCPマイモンスキャン
C. UDPスキャン
D. ACKフラグプローブスキャン
Answer: A
Explanation:
One of the most common Nmap usage scenarios is scanning an Ethernet LAN. Most LANs, especially those that use the private address range granted by RFC 1918, do not always use the overwhelming majority of IP addresses. When Nmap attempts to send a raw IP packet, such as an ICMP echo request, the OS must determine a destination hardware (ARP) address, such as the target IP, so that the Ethernet frame can be properly addressed. .. This is required to issue a series of ARP requests. This is best illustrated by an example where a ping scan is attempted against an Area Ethernet host. The -send-ip option tells Nmap to send IP-level packets (rather than raw Ethernet), even on area networks. The Wireshark output of the three ARP requests and their timing have been pasted into the session.
Raw IP ping scan example for offline targets
This example took quite a couple of seconds to finish because the (Linux) OS sent three ARP requests at 1 second intervals before abandoning the host. Waiting for a few seconds is excessive, as long as the ARP response usually arrives within a few milliseconds. Reducing this timeout period is not a priority for OS vendors, as the overwhelming majority of packets are sent to the host that actually exists. Nmap, on the other hand, needs to send packets to 16 million IP s given a target like 10.0.0.0/8. Many targets are pinged in parallel, but waiting 2 seconds each is very delayed.
There is another problem with raw IP ping scans on the LAN. If the destination host turns out to be unresponsive, as in the previous example, the source host usually adds an incomplete entry for that destination IP to the kernel ARP table. ARP tablespaces are finite and some operating systems become unresponsive when full. If Nmap is used in rawIP mode (-send-ip), Nmap may have to wait a few minutes for the ARP cache entry to expire before continuing host discovery.
ARP scans solve both problems by giving Nmap the highest priority. Nmap issues raw ARP requests and handles retransmissions and timeout periods in its sole discretion. The system ARP cache is bypassed. The example shows the difference. This ARP scan takes just over a tenth of the time it takes for an equivalent IP.
Example b ARP ping scan of offline target

In example b, neither the -PR option nor the -send-eth option has any effect. This is often because ARP has a default scan type on the Area Ethernet network when scanning Ethernet hosts that Nmap discovers. This includes traditional wired Ethernet as 802.11 wireless networks. As mentioned above, ARP scanning is not only more efficient, but also more accurate. Hosts frequently block IP-based ping packets, but usually cannot block ARP requests or responses and communicate over the network.Nmap uses ARP instead of all targets on equivalent targets, even if different ping types (such as -PE and -PS) are specified. LAN.. If you do not need to attempt an ARP scan at all, specify -send-ip as shown in Example a "Raw IP Ping Scan for Offline Targets".
If you give Nmap control to send raw Ethernet frames, Nmap can also adjust the source MAC address. If you have the only PowerBook in your security conference room and a large ARP scan is initiated from an Apple-registered MAC address, your head may turn to you. Use the -spoof-mac option to spoof the MAC address as described in the MAC Address Spoofing section.

NEW QUESTION: 4
About Huawei's smart photovoltaic solution grounding system design, which of the following is correct? (Multiple Choice)
A. Grounding flat steel coated with anti-rust paint, and annual derusting and painting maintenance;
B. The inverter ground wire is connected to the component bracket, and the bracket is grounded.
C. The device is reliably grounded nearby
D. Grounding flat steel is installed next to the cement column at each end of each bracket, and all grounded flat steel rings are welded back together after being buried in the ground;
Answer: A,C,D