- (Topic 3)
A network administrator needs to change where the outside DNS records are hosted.
Which of the following records should the administrator change at the registrar to accomplish this task?

Correct Answer:A
NS stands for Name Server, and it is a DNS record that specifies which servers are authoritative for a domain. The registrar is the entity that manages the domain registration and delegation, and it maintains the NS records for each domain. To change where the outside DNS records are hosted, the network administrator needs to change the NS records at the registrar to point to the new DNS servers that will host the outside DNS records.
References:
✑ DNS Record Types – N10-008 CompTIA Network+ : 1.61
✑ CompTIA Network+ N10-008 Cert Guide, page 1472

- (Topic 3)
Users report they cannot reach any websites on the internet. An on-site network engineer is able to duplicate the issue on a different PC. The network engineer then tries to ping a website and receives the following message:
Ping request could not find host www.google.com. Please check the name and try again. Which of the following is the next step the engineer should take?

Correct Answer:C

The error message “Ping request could not find host www.google.com” indicates that the network engineer’s PC cannot resolve the hostname www.google.com to its corresponding IP address. This means that there is a problem with the DNS (Domain Name System) service, which is responsible for translating hostnames to IP addresses and vice versa. The DNS service can be provided by internal or external name servers, depending on the network configuration.
The next step the engineer should take is to ping the internal name server functionality, which means to test if the PC can communicate with the name server that is configured in its network settings, and if the name server can resolve internal hostnames, such as those of the company’s servers or devices. To do this, the engineer can use the following commands:
✑ To find out the IP address of the name server, use ipconfig /all and look for the DNS Servers entry.
✑ To ping the name server, use ping and check if the packets are sent and received successfully.
✑ To test the name resolution, use nslookup and check if the name server returns the correct IP address.
If the ping or the nslookup commands fail, it means that the internal name server is not working properly, and the engineer should troubleshoot the name server configuration or connectivity. If the ping and the nslookup commands succeed, it means that the internal name server is working properly, but there is a problem with the external name resolution, and the engineer should check the internet firewall logs for blocked DNS traffic, or test the website from outside the company.
ReferencesWindows 10 can’t resolve hostnames - ping with IP works but not with hostnamePing request could not find host xyz.local. Please check the name and try againDNS problem, nslookup works, ping doesn’t Users are connected to a switch on an Ethernet interface of a campus router. The service provider is connected to the serial 1 interface on the router. The output of the interfaces is:
E1/0: 192.168.8.1/24 S1: 192.168.7.252/30

- (Topic 3)
Which of the following is a characteristic of the application layer?

Correct Answer:A

The application layer is the highest layer of the OSI model, and it provides the interface between the user and the network. It does not handle the details of packet delivery, such as addressing, routing, error checking, or encryption. Those functions are performed by the lower layers of the OSI model. The application layer only focuses on the format, content, and presentation of the data.
References:
✑ Understanding the OSI Model – N10-008 CompTIA Network+ : 1.11
✑ CompTIA Network+ Certification Exam Objectives, page 92

- (Topic 3)
A network engineer is monitoring a fiber uplink to a remote office and notes the uplink has been operating at 100

Correct Answer:A
When a fiber uplink is operating at 100

- (Topic 3)
A network security administrator needs to monitor the contents of data sent between a secure network and the rest of the company. Which of the following monitoring methods will accomplish this task?

Correct Answer:A
Port mirroring is a method of monitoring network traffic by copying the data packets from one port to another port on the same switch or router. This allows the network security administrator to analyze the contents of the data sent between different networks without affecting the performance or security of the original traffic. Port mirroring can be configured to capture all traffic or only specific types of traffic, such as VLANs, protocols, or IP addresses.
References:
✑ Port Mirroring - CompTIA Network+ N10-008 Domain 3.1 - YouTube1
✑ CompTIA Network+ Certification Exam Objectives, page 142

SIMULATION - (Topic 1)
You are tasked with verifying the following requirements are met in order to ensure network security.
Requirements: Datacenter
Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage
Provide a dedicated server to resolve IP addresses and hostnames correctly and handle port 53 traffic
Building A
Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage
Provide devices to support 5 additional different office users Add an additional mobile user
Replace the Telnet server with a more secure solution Screened subnet
Ensure network is subnetted to allow all devices to communicate properly while minimizing address space usage
Provide a server to handle external 80/443 traffic Provide a server to handle port 20/21 traffic INSTRUCTIONS
Drag and drop objects onto the appropriate locations. Objects can be used multiple times and not all placeholders need to be filled.
Available objects are located in both the Servers and Devices tabs of the Drag & Drop menu.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Solution:
Screened Subnet devices – Web server, FTP server
Building A devices – SSH server top left, workstations on all 5 on the right, laptop on bottom left
DataCenter devices – DNS server.



A screenshot of a computer
Description automatically generated

Does this meet the goal?

Correct Answer:A