A network engineer performed a migration to a new mail server. The engineer changed the MX record, verified the change was accurate, and confirmed the new mail server was reachable via the IP address in the A record. However, users are not receiving email.
Which of the following should the engineer have done to prevent the issue from occurring?
A. Change the email client configuration to match the MX record.
B. Reduce the TTL record prior to the MX record change.
C. Perform a DNS zone transfer prior to the MX record change.
D. Update the NS record to reflect the IP address change.
Correct Answer: B
Understanding TTL (Time to Live):
uk.co.certification.simulator.questionpool.PList@5e5842cf Impact of TTL on DNS Changes:
Best Practice Before Making DNS Changes:
Verification of DNS Changes:
Comparison with Other Options:
References:
CompTIA Network+ study materials and DNS best practices.
Question 122:
A client with a 2.4GHz wireless network has stated that the entire office is experiencing intermittent issues with laptops after the WAP was moved.
Which of the following is the most likely reason for these issues?
A. The network uses a non-overlapping channel.
B. The signal is reflecting too much.
C. The network has excessive noise.
D. A microwave is in the office.
Correct Answer: D
Microwaves are known to interfere with the 2.4GHz frequency, which is the same frequency used by many wireless networks. This can cause signal degradation and intermittent connectivity issues, especially if the WAP is placed near such devices.
Question 123:
Which of the following panels would be best to facilitate a central termination point for all network cables on the floor of a company building?
Which of the following describes the best reason for using BGP?
A. Preventing a loop within a LAN
B. Improving reconvergence times
C. Exchanging router updates with a different ISP
D. Sharing routes with a Layer 3 switch
Correct Answer: C
BGP (Border Gateway Protocol) is used for routing data between different ISPs, making it essential for the functioning of the internet. Its primary use is for exchanging routing information between autonomous systems, especially different ISPs. Preventing loops within a LAN is handled by protocols like Spanning Tree Protocol (STP), while improving reconvergence times and sharing routes with a Layer 3 switch are functions of other protocols or internal mechanisms.
Reference:
The CompTIA Network+ training emphasizes BGP's role in the exchange of routing information across different ISPs and autonomous systems.
Question 125:
Which of the following technologies are X.509 certificates most commonly associated with?
A. PKI
B. VLAN tagging
C. LDAP
D. MFA
Correct Answer: A
X.509 certificates are most commonly associated with Public Key Infrastructure (PKI). These certificates are used for a variety of security functions, including digital signatures, encryption, and authentication. PKI: X.509 certificates are a
fundamental component of PKI, used to manage encryption keys and authenticate users and devices. Digital Certificates: They are used to establish secure communications over networks, such as SSL/TLS for websites and secure email
communication. Authentication and Encryption: X.509 certificates provide the means to securely exchange keys and verify identities in various applications, ensuring data integrity and confidentiality.
Network References:
CompTIA Network+ N10-007 Official Certification Guide: Covers PKI and the role of X.509 certificates in network security.
Cisco Networking Academy: Provides training on PKI, certificates, and secure communications.
Network+ Certification All-in-One uide: Explains PKI, X.509 certificates, and their applications in securing network communications.
Question 126:
Which of the following allows a remote user to connect to the network?
A. Command-line interface
B. API gateway
C. Client-to-site VPN
D. Jump box
Correct Answer: C
A Client-to-Site VPN allows a remote user to securely connect to a company's internal network, providing access as if they were physically on-site.
Question 127:
Which of the following are environmental factors that should be considered when installing equipment in a building? (Select two).
A. Fire suppression system
B. UPS location
C. Humidity control
D. Power load
E. Floor construction type
F. Proximity to nearest MDF
Correct Answer: A
When installing equipment in a building, environmental factors are critical to ensure the safety and longevity of the equipment. A fire suppression system is essential to protect the equipment from fire hazards. Humidity control is crucial to prevent moisture-related damage, such as corrosion and short circuits, which can adversely affect electronic components. Both factors are vital for maintaining an optimal environment for networking equipment.References: CompTIA Network
+ study materials.
Question 128:
A network administrator notices interference with industrial equipment in the 2.4GHz range. Which of the following technologies would most likely mitigate this issue? (Select two).
CompTIA Network+ study materials on wireless networking and interference mitigation.
Question 129:
Which of the following best describes the transmission format that occurs at the transport layer over connectionless communication?
A. Datagram
B. Segment
C. Frames
D. Packets
Correct Answer: A
At the transport layer, connectionless communication is typically handled using the User Datagram Protocol (UDP), which transmits data in units called datagrams. Unlike TCP, UDP does not establish a connection before sending data and
does not guarantee delivery, making datagrams the correct term for the transmission format in this context.
References: CompTIA Network+ Exam Objectives and official study guides.
Question 130:
Before using a guest network, an administrator requires users to accept the terms of use
Which of the following is the best way to accomplish this goal?
A. Pre-shared key
B. Autonomous access point
C. Captive portal
D. WPA2 encryption
Correct Answer: C
A captive portal is a web page that users must view and interact with before being granted access to a network. It is commonly used in guest networks to enforce terms of use agreements. When a user connects to the network, they are redirected to this portal where they must accept the terms of use before proceeding. This method ensures that users are aware of and agree to the network's policies, making it the best choice for this scenario. References: CompTIA Network
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