A network administrator needs to create a way to redirect a network resource that has been on the local network but is now hosted as a SaaS solution. Which of the following records should be used to accomplish the task?
A. TXT
B. AAA
C. PTR
D. CNAME
Show Answer
Correct Answer: D
Explanation: A CNAME (Canonical Name) record creates an alias from one hostname to another hostname, allowing clients to be redirected to a service now hosted under a different domain, such as a SaaS provider. TXT stores text data, PTR is for reverse DNS lookups, and AAA is not a standard DNS record type (AAAA is IPv6 address mapping).
Question 142
An administrator needs to configure an IoT device with a /21 subnet mask, but the device will only accept dotted decimal notation. Which of the following subnet masks should the administrator use?
A. 255.255.224.0
B. 255.255.240.0
C. 255.255.248.0
D. 255.255.252.0
Show Answer
Correct Answer: C
Explanation: A /21 subnet mask has 21 leading 1 bits: 11111111.11111111.11111000.00000000, which converts to 255.255.248.0. The other options correspond to /19 (255.255.224.0), /20 (255.255.240.0), and /22 (255.255.252.0).
Question 143
Which of the following tools uses ICMP to help determine whether a network host is reachable?
A. tcpdump
B. netstat
C. nslookup
D. ping
Show Answer
Correct Answer: D
Explanation: The ping utility uses the Internet Control Message Protocol (ICMP), specifically ICMP Echo Request and Echo Reply messages, to test whether a remote host is reachable over the network. The other tools serve different purposes: tcpdump captures packets, netstat displays network connections and statistics, and nslookup performs DNS queries.
Question 144
A user submits an escalated ticket regarding failed logins on their laptop. The user states that the time displayed on the laptop is incorrect. An administrator thinks the issue is related to the NTP. Which of the following should the administrator do next?
A. Create a plan of action.
B. Implement a solution.
C. Identify the problem.
D. Test the theory.
Show Answer
Correct Answer: D
Explanation: The troubleshooting process has already reached the point where the administrator has identified the symptoms (failed logins and incorrect system time) and has established a theory of probable cause (an NTP issue). The next step in the standard troubleshooting methodology is to test that theory by verifying the NTP configuration, synchronization status, and whether correcting time resolves the login issue. Planning and implementing a solution come only after the theory is confirmed.
Question 145
A technician is implementing a new SD-WAN device with a default configuration. The technician receives a URL via email and connects the new device to the internet to complete the installation. Which of the following is this an example of?
A. Voice VLAN
B. Native VLAN
C. Data VLAN
D. Trunk port
Show Answer
Correct Answer: C
Explanation: A default-configured SD-WAN device connecting to the internet to complete its initial provisioning is simply carrying normal network data traffic. A data VLAN is used for standard user/device traffic. A voice VLAN is for IP phones, a native VLAN is the untagged VLAN on an 802.1Q trunk, and a trunk port is a port type rather than a VLAN.
Question 146
A data center administrator is evaluating the use of jumbo frames within a storage environment. Which of the following describes the best reason to use jumbo frames in the storage environment?
A. To reduce device overhead
B. To report on the current root switch in the STP
C. To improve routing convergence
D. To increase drive throughput
Show Answer
Correct Answer: A
Explanation: Jumbo frames increase the Ethernet MTU (commonly to around 9000 bytes), allowing more payload per frame. In storage environments such as iSCSI, this reduces the number of frames that must be transmitted and processed, lowering CPU utilization, interrupts, and protocol overhead on network devices and hosts. They do not affect STP root reporting, routing convergence, or the physical throughput of storage drives.
Question 147
A network administrator needs to secure SNMP access with authentication and encryption. Which of the following should the administrator use?
A. SNMPv3
B. SNMP community string
C. SNMP ACL access group
D. SNMPv2c
Show Answer
Correct Answer: A
Explanation: SNMPv3 is the only SNMP version that provides built-in authentication, encryption (privacy), and message integrity. SNMPv2c relies on community strings and does not provide encryption or strong authentication. Community strings and ACLs alone do not satisfy both authentication and encryption requirements.
Question 148
A medical clinic recently configured a guest wireless network on the existing router. Since then, guests have been changing the music on the speaker system. Which of the following actions should the clinic take to prevent unauthorized access? (Choose two.)
A. Isolate smart devices to their own network segment.
B. Configure IPS to prevent guests from making changes.
C. Install a new AP on the network.
D. Set up a syslog server to log who is making changes.
E. Change the default credentials.
F. Configure GRE on the wireless router.
Show Answer
Correct Answer: A, E
Explanation: Guest clients should not have access to internal IoT devices such as network-connected speakers; placing smart devices on a separate network segment/VLAN prevents guest access. Additionally, changing default credentials on the speaker or other smart devices prevents unauthorized configuration if default logins are being exploited. IPS, syslog, a new AP, or GRE do not address the root cause of guest access to internal devices.
Question 149
A network engineer needs to deploy an access point at a remote office so that it will not communicate back to the wireless LAN controller. Which of the following deployment methods must the engineer use to accomplish this task?
A. ESSID
B. Lightweight
C. Autonomous
D. Ad hoc
Show Answer
Correct Answer: C
Explanation: An autonomous access point operates independently and does not require or communicate with a wireless LAN controller for normal operation. Lightweight access points rely on a WLC, an ESSID is a network identifier rather than a deployment mode, and ad hoc refers to peer-to-peer wireless networking between clients.
Question 150
A network technician receives a new ticket while working on another issue. The new ticket is critical to business operations. Which of the following documents should the technician reference to determine which ticket to complete first?
A. NDA
B. AUP
C. SLA
D. MOU
Show Answer
Correct Answer: C
Explanation: A Service Level Agreement (SLA) defines service priorities, response times, and resolution targets for different ticket severities. A critical business-impacting ticket should be prioritized according to the SLA. An NDA covers confidentiality, an AUP defines acceptable use, and an MOU outlines general understanding between parties.
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