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質問 # 591
Which of the following ports creates a secure connection to a directory service?
正解：A
解説：
LDAP (Lightweight Directory Access Protocol) uses port 389 for standard connections and port 636 for LDAP over SSL (LDAPS), which secures directory service communication.
Breakdown of Options:
A: 22 - SSH port, not used for directory services.
B: 389 - Used for LDAP, but not encrypted.
C: 445 - Used for SMB file sharing, not LDAP.
D: 636 - Correct answer. LDAPS (LDAP over SSL/TLS) secures directory authentication.
Reference:
CompTIA Network+ (N10-009) Official Study Guide - Domain 3.1: Compare and contrast network protocols.
RFC 4511: Lightweight Directory Access Protocol (LDAP)
質問 # 592
A network technician is troubleshooting an issue between a web server and computers within a LAN. The technician needs to gather information about the IP addresses, protocols, and content of the traffic. Which of the following will best help the technician troubleshoot the issue?
正解：A
解説：
Packet capture records the actual traffic - including IP headers, protocol details, and payload content - enabling full analysis of what's being sent and received.
質問 # 593
A network administrator needs to fail over services to an off-site environment. This process will take four weeks to become fully operational. Which of the following DR concepts does this describe?
正解：D
解説：
A cold site is a backup facility that provides infrastructure (such as power, cooling, and space) but does not have active IT resources installed. When a disaster occurs, IT teams must bring in and configure all necessary hardware and software before services can resume. This process can take weeks or longer--which matches the scenario described.
質問 # 594
Which of the following is the most cost-effective way for a network administrator to establish a persistent, secure connection between two facilities?
正解：D
解説：
A Site-to-site VPN (Virtual Private Network) is the most cost-effective solution for establishing a persistent, secure connection between two facilities. It uses the public internet to create an encrypted tunnel, leveraging existing internet connections without requiring expensive dedicated infrastructure. This makes it ideal for organizations looking to securely connect remote sites while minimizing costs.
Why not GRE tunnel? Generic Routing Encapsulation (GRE) tunnels encapsulate traffic but do not provide encryption natively, requiring additional protocols (e.g., IPsec) for security. This adds complexity and is less cost-effective than a site-to-site VPN, which integrates encryption.
Why not VXLAN? Virtual Extensible LAN (VXLAN) is used for overlay networks in data centers to extend Layer 2 networks, not for secure site-to-site connectivity.
Why not Dedicated line? A dedicated line (e.g., leased line or MPLS) provides high reliability but is significantly more expensive due to the need for dedicated infrastructure.
質問 # 595
A security administrator is creating a new firewall object for a device with IP address 192.168.100.1/25. However, the firewall software only uses dotted decimal notation in configuration fields. Which of the following is the correct subnet mask to use?
正解：D
解説：
A /25 subnet mask means 25 bits are reserved for the network portion, leaving 7 bits for host addresses. In dotted decimal, that is:
11111111.11111111.11111111.10000000
Decimal equivalent: 255.255.255.128
A . 255.255.254.0 corresponds to /23.
B . 255.255.255.1 is invalid as a subnet mask.
D . 255.255.255.192 corresponds to /26.
Thus, the correct subnet mask for a /25 network is 255.255.255.128.
質問 # 596
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