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| Section | Objectives |
|---|---|
| Topic 1: Network Defense Fundamentals | - Security policies and procedures - Network security principles and architectures |
| Topic 2: Threats and Vulnerabilities | - Malware and attack vectors - Network reconnaissance and exploitation techniques |
| Topic 3: Incident Response and Recovery | - Incident handling lifecycle - Disaster recovery and business continuity |
| Topic 4: Network Security Controls | - Secure network devices configuration - Firewalls, IDS/IPS, and network access control |
| Topic 5: Network Security Monitoring | - Traffic monitoring and anomaly detection - Log analysis and SIEM fundamentals |
| Topic 6: Data and Application Security | - Data protection mechanisms and encryption basics - Endpoint and application hardening |
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質問 # 341
James, a network admin in a large US based IT firm, was asked to audit and implement security controls over all network layers to achieve Defense-in-Depth. While working on this assignment, James has implemented both blacklisting and whitelisting ACLs. Which layer of defense-in-depth architecture is Jason working on currently?
正解：C
解説：
James is working on the Perimeter Layer of the Defense-in-Depth architecture. This layer is responsible for protecting the network's boundaries from unauthorized access and attacks. The implementation of blacklisting and whitelisting Access Control Lists (ACLs) is a common practice at this layer. Blacklisting ACLs block known malicious entities, while whitelisting ACLs allow only approved entities to access the network. These measures are part of the perimeter defenses that include firewalls, intrusion detection systems, and other boundary security mechanisms designed to prevent attackers from gaining initial access to the network infrastructure1234.
References:
* Defense in depth explained: Layering tools and processes for better security1.
* What is a whitelist and a blacklist? - National Cybersecurity Society2.
* Blacklisting vs Whitelisting: What's the Difference? - Instasafe3.
* Whitelisting, blacklisting, and your security strategy: It's not either/or4.
質問 # 342
Which of the following tools is a free portable tracker that helps the user to trace the laptop if it is stolen?
正解：B
質問 # 343
Which of the following UTP cables supports transmission up to 20MHz?
正解：D
質問 # 344
FILL BLANK
Fill in the blank with the appropriate term. A ______________________ network is a local area network (LAN)
in which all computers are connected in a ring or star topology and a bit- or token-passing scheme is used for
preventing the collision of data between two computers that want to send messages at the same time.
正解：
解説：
Token Ring
Explanation:
A Token Ring network is a local area network (LAN) in which all computers are connected in a ring or star
topology and a bit- or token-passing scheme is used in order to prevent the collision of data between two
computers that want to send messages at the same time. The Token Ring protocol is the second most widely-
used protocol on local area networks after Ethernet. The IBM Token Ring protocol led to a standard version,
specified as IEEE 802.5. Both protocols are used and are very similar. The IEEE 802.5 Token Ring technology
provides for data transfer rates of either 4 or 16 megabits per second.
Working:
Empty information frames are constantly circulated on the ring. When a computer has a message to send, it
adds a token to an empty frame and adds a message and a destination identifier to the frame. The frame is
then observed by each successive workstation. If the workstation sees that it is the destination for the
message, it copies the message from the frame and modifies the token back to 0. When the frame gets back
to the originator, it sees that the token has been modified to 0 and that the message has been copied and
received. It removes the message from the particular frame. The frame continues to circulate as an empty
frame, ready to be taken by a workstation when it has a message to send.
質問 # 345
Which of the following devices helps in connecting a PC to an ISP via a PSTN?
正解：C
解説：
Explanation/Reference:
質問 # 346
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