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質問 # 63
A network engineer discovers network traffic that is sending confidential information to an unauthorized and unknown destination. Which of the following best describes the cause of this network traffic?
正解：A
解説：
Malware refers to any malicious software that can exfiltrate confidential data, including spyware, trojans, and rootkits. This fits the scenario where unauthorized data transfer is occurring.
Breakdown of Options:
A: Adware - Displays ads, does not typically steal data.
B: Ransomware - Encrypts files but does not exfiltrate data.
C: Darkware - Not a real cybersecurity term.
D: Malware - Correct answer. Malicious software is responsible for unauthorized data exfiltration.
Reference:
CompTIA Network+ (N10-009) Official Study Guide - Domain 3.5: Given a scenario, implement cybersecurity measures.
NIST 800-83: Malware Incident Prevention & Handling
質問 # 64
A company's marketing team created a new application and would like to create a DNS record for newapplication.comptia.org that always resolves to the same address as www.comptia.org.
Which of the following records should the administrator use?
正解：A
解説：
A CNAME (Canonical Name) record is used in DNS to alias one domain name to another. This means that newapplication.comptia.org can be made to resolve to the same IP address as www.comptia.org by creating a CNAME record pointing newapplication.comptia.org to www.comptia.org. SOA (Start of Authority) is used for DNS zone information, MX (Mail Exchange) is for mail server records, and NS (Name Server) is for specifying authoritative DNS servers.
質問 # 65
A network administrator configured a router interface as 10.0.0.95 255.255.255.240. The administrator discovers that the router is not routing packets to a web server with IP 10.0.0.81/28. Which of the following is the best explanation?
正解：B
解説：
* Understanding Subnetting:
* The subnet mask 255.255.255.240 (or /28) indicates that each subnet has 16 IP addresses (14 usable addresses, 1 network address, and 1 broadcast address).
* Calculating the Subnet Range:
* Subnet Calculation:For the IP address 10.0.0.95 with a /28 subnet mask:
* Network address: 10.0.0.80
* Usable IP range: 10.0.0.81 to 10.0.0.94
* Broadcast address: 10.0.0.95
* Router Interface Configuration:
* Broadcast Address Issue:The IP address 10.0.0.95 is the broadcast address for the subnet
10.0.0.80/28. Configuring a router interface with the broadcast address will cause routing issues as it is not a valid host address.
* Comparison with Other Options:
* The web server is in a different subnet:The web server (10.0.0.81) is within the same subnet range (10.0.0.80/28).
* The IP address space is a class A network:While 10.0.0.0 is a Class A network, this does not explain the routing issue caused by the broadcast address.
* The subnet is in a private address space:The private address space designation (RFC 1918) does not impact the routing issue related to the broadcast address configuration.
* Resolution:
* Reconfigure the router interface with a valid host IP address within the usable range, such as
10.0.0.94.
References:
* CompTIA Network+ study materials on subnetting and IP address configuration.
質問 # 66
Which of the following describes a malicious application that takes advantage of a software flaw?
正解：A
解説：
An exploit is a malicious application or code that takes advantage of a vulnerability (a flaw or weakness) in software to perform unauthorized actions.
Risk is the potential for loss or damage. Vulnerability is the flaw or weakness that could be exploited. Threat is any circumstance or event that has the potential to cause harm.
The exploit is the actual attack mechanism that abuses the vulnerability.
質問 # 67
A network technician is troubleshooting a web application's poor performance. The office has two internet links that share the traffic load. Which of the following tools should the technician use to determine which link is being used for the web application?
正解：A
解説：
Understanding Tracert:
Traceroute Tool: tracert (Windows) or traceroute (Linux) is a network diagnostic tool used to trace the path that packets take from a source to a destination. It lists all the intermediate routers the packets traverse.
Determining Traffic Path:
Path Identification: By running tracert to the web application's destination IP address, the technician can identify which route the traffic is taking and thereby determine which internet link is being used.
Load Balancing Insight: If the office uses load balancing for its internet links, tracert can help verify which link is currently handling the traffic for the web application.
Comparison with Other Tools:
netstat: Displays network connections, routing tables, interface statistics, and more, but does not trace the path of packets.
nslookup: Used for querying DNS to obtain domain name or IP address mapping, not for tracing packet routes.
ping: Tests connectivity and measures round-trip time but does not provide path information.
Implementation:
Open a command prompt or terminal.
Execute tracert [destination IP] to trace the route.
Analyze the output to determine the path and the link being used.
Reference:
CompTIA Network+ study materials on network troubleshooting and diagnostic tools.
質問 # 68
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