Which of the following record types does an IP-to-name lookup use in DNS?
A. NS
B. PTR
C. A
D. CNAME
Show Answer
Correct Answer: B
Explanation: A reverse DNS lookup maps an IP address to a hostname using a PTR (Pointer) record. An A record maps a hostname to an IPv4 address, NS identifies authoritative name servers, and CNAME provides an alias to another hostname.
Question 102
A network administrator wants an automatic alert to be sent when a switch’s link status changes, administered through SNMP. Which of the following SNMP technologies will allow for this alert?
A. Trap
B. Object identifier
C. String
D. MIB
Show Answer
Correct Answer: A
Explanation: An SNMP trap is an unsolicited notification sent by a managed device to an SNMP manager when an event occurs, such as a switch link changing status.
Question 103
A company's marketing team created a new application and would like to create a DNS record for newapplication.comptia.org that always resolves to the same address as wwww.comptia.org. Which of the following records should the administrator use?
A. SOA
B. MX
C. CNAME
D. NS
Show Answer
Correct Answer: C
Explanation: A CNAME record creates an alias for another DNS name, so newapplication.comptia.org can resolve to the same address as wwww.comptia.org.
Question 103
A technician configures a new printer and places it on the network. Which of the following is the best way to ensure the printer will always keep the same IP configuration?
A. Add a new scope.
B. Place an exclusion.
C. Extend the lease time.
D. Create a reservation.
Show Answer
Correct Answer: D
Explanation: A DHCP reservation binds the printer's MAC address to a specific IP address so it consistently receives the same IP configuration. A new scope creates a different address pool, an exclusion only prevents DHCP from assigning certain addresses, and extending the lease time does not guarantee the address will never change.
Question 103
A media company is implementing a global streaming service. Which of the following should the company apply to each regional point of presence in order to comply with local laws?
A. ACL
B. Port security
C. Key management
D. Content Altering
Show Answer
Correct Answer: D
Explanation: Content altering or filtering at each regional point of presence can restrict or modify content to meet that region’s legal requirements. ACLs and port security control network access, while key management handles encryption keys.
Question 104
A network administrator is notified that a user cannot access resources on the network. The network administrator checks the physical connections to the workstation labeled User 3 and sees the Ethernet is properly connected. However, the network interface’s indicator lights are not blinking on either the computer or the switch. Which of the following is the most likely cause?
A. The switch failed.
B. The default gateway is wrong.
C. The port is shut down.
D. The VLAN assignment is incorrect.
Show Answer
Correct Answer: C
Explanation: A shut-down switch port prevents the Ethernet link from coming up, so the workstation and switch show no link/activity lights. An incorrect gateway or VLAN assignment would not normally eliminate the physical link lights.
Question 104
Employees report that the network is slow. The network engineer thinks the performance issue is with an upstream router. Which of the following tools should the engineer use to determine the location of the issue?
A. nslookup and dig
B. Nmap and speed tester
C. traced and ping
D. tcpdump and protocol analyzer
Show Answer
Correct Answer: C
Explanation: Traceroute (or tracert) shows the network hops to the destination and their response times, helping identify where along the route latency or packet loss begins. Ping can then test connectivity and response time to a particular hop. Option C appears to mean traceroute and ping.
Question 105
A network administrator notices interference with industrial equipment in the 2.4GHz range. Which of the following technologies would most likely mitigate this issue? (Choose two.)
A. Mesh network
B. 5GHz frequency
C. Omnidirectional antenna
D. Non-overlapping channel
E. Captive portal
F. Ad hoc network
Show Answer
Correct Answer: B, D
Explanation: Switching to 5 GHz avoids much of the interference affecting the 2.4 GHz band. If operating in 2.4 GHz, choosing a non-overlapping channel (such as 1, 6, or 11) can reduce interference from nearby Wi-Fi networks.
Question 105
A network technician implements a switch with multiple VLANs. Which of the following items should the technician configure to ensure that clients can communicate with clients in other VLANs?
A. VPC
B. VXLAN
C. ACL
D. SVI
Show Answer
Correct Answer: D
Explanation: A switched virtual interface (SVI) provides a Layer 3 interface and default gateway for a VLAN. Configuring SVIs on a multilayer switch enables routing between VLANs so their clients can communicate.
Question 106
Which of the following will a router prioritize first in the route selection process?
A. Prefix length
B. Metric
C. Administrative distance
D. Default route
Show Answer
Correct Answer: A
Explanation: Routers first perform longest-prefix matching. The most specific matching route (largest prefix length) is selected before considering administrative distance or metric. Administrative distance is only compared among routes to the same destination prefix from different sources, and metrics are compared within the same routing protocol. A default route is used only if no more specific match exists.
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