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NEW QUESTION # 328
Which of the following terms describes the capability in a public cloud to add or remove compute resources based on need?
Answer: B
Explanation:
The correct answer is C. Elasticity . In cloud computing, elasticity refers to the ability to increase or decrease resources quickly based on current demand . If workloads rise, more compute resources can be allocated. If demand drops, those resources can be reduced again. That is exactly what the question is describing.
This is slightly different from scalability . Scalability is the broader idea that a system can grow to handle more workload. Elasticity focuses more on the dynamic, on-demand adjustment of resources as conditions change. In exam questions, wording like "add or remove based on need" usually points straight to elasticity.
The other answer choices do not fit. Availability is about uptime and service access. Multitenancy refers to multiple customers sharing underlying cloud infrastructure while remaining logically separated. Neither describes rapid expansion and contraction of compute resources.
From a Network+ study perspective, elasticity is one of the core cloud characteristics to remember because it explains why cloud services are useful for workloads that are unpredictable or variable. Instead of permanently building for peak demand, organizations can consume more or less compute as required. That makes elasticity the best answer.
NEW QUESTION # 329
Which of the following protocols is used to send networking status messages between clients and servers?
Answer: B
Explanation:
The correct answer is SNMP (Simple Network Management Protocol) because it is specifically designed to collect and transmit network management and status information between managed devices and management systems. According to CompTIA Network+ (N10-009) objectives, SNMP is used for monitoring and managing network devices such as routers, switches, servers, and printers.
SNMP operates using a manager-agent model. The SNMP manager (such as a network monitoring server) communicates with SNMP agents installed on network devices. Agents send traps and inform messages, which are unsolicited status alerts indicating events such as device failures, high CPU usage, or link outages.
The manager can also poll agents to retrieve performance metrics and configuration details stored in the Management Information Base (MIB).
SSH (Option A) is used for secure remote administration. DHCP (Option B) dynamically assigns IP addresses. NTP (Option C) synchronizes time between devices. None of these protocols are designed for network status monitoring and alert messaging.
Therefore, SNMP is the correct protocol for sending networking status messages between devices and management systems.
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NEW QUESTION # 330
A network engineer is troubleshooting an issue with an SMTP relay server. The engineer suspects the issue is related to a reverse DNS lookup failure. Which of the following should the engineer implement to resolve the issue?
Answer: C
Explanation:
A PTR record is used for reverse DNS resolution and is therefore the correct solution. A normal forward DNS lookup maps a hostname to an IP address using records such as an A record for IPv4 or an AAAA record for IPv6. A reverse DNS lookup does the opposite: it takes an IP address and resolves it to a hostname. PTR, or Pointer, records provide this mapping.
The CompTIA Network+ N10-009 objectives require familiarity with DNS services and common record types. Reverse DNS is particularly important for SMTP servers because many receiving mail servers perform reverse lookups as part of anti-spam and reputation checks. If the sending mail server ' s public IP address does not have an appropriate PTR record, messages may be rejected, delayed, or classified as suspicious.
An MX record specifies which mail servers receive email for a domain, but it does not perform reverse resolution. DNSSEC provides validation of DNS data to help protect against spoofed or altered DNS responses. DoT, or DNS over TLS, encrypts DNS queries between systems. Neither addresses a missing reverse DNS mapping. Therefore, the engineer should implement a PTR record.
NEW QUESTION # 331
A network engineer wants to implement a new IDS between the switch and a router connected to the LAN.
The engineer does not want to introduce any latency by placing the IDS in line with the gateway. The engineer does want to ensure that the IDS sees all packets without any loss. Which of the following is the best way for the engineer to implement the IDS?
Answer: B
Explanation:
Reference: CompTIA Network+ Certification Exam Objectives - Network Security section.
NEW QUESTION # 332
Which of the following will allow secure, remote access to internal applications?
Answer: B
Explanation:
A Virtual Private Network (VPN) creates an encrypted connection between a remote user and an internal network, ensuring secure access to internal applications. VPNs use encryption protocols like IPSec and SSL/TLS to protect data during transmission. They are widely used for secure remote work, accessing company resources, and bypassing geographic restrictions.
NEW QUESTION # 333
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