N10-009 Free Practice Test

- (Exam Topic 3)
A large number of PCs are obtaining an APIPA IP address, and a number of new computers were added to the network. Which of the following is MOST likely causing the PCs to obtain an APIPA address?

1. A. Rogue DHCP server
2. B. Network collision
3. C. Incorrect DNS settings
4. D. DHCP scope exhaustion

Correct Answer: D
DHCP scope exhaustion means that there are no more available IP addresses in the DHCP server’s pool of addresses to assign to new devices on the network. When this happens, the devices will use APIPA (Automatic Private IP Addressing) to self-configure an IP address in the range of 169.254.0.1 to 169.254.255.2541. These addresses are not routable and can only communicate with other devices on the same local network.
A rogue DHCP server (A) is an unauthorized DHCP server that can cause IP address conflicts or security issues by assigning IP addresses to devices on the network. A network collision (B) is a situation where two or more devices try to send data on the same network segment at the same time, causing interference and data loss. Incorrect DNS settings © can prevent devices from resolving domain names to IP addresses, but they do not affect the DHCP process.

- (Exam Topic 1)
A company built a new building at its headquarters location. The new building is connected to the company’s LAN via fiber-optic cable. Multiple users in the new building are unable to access the company’s intranet site via their web browser, but they are able to access internet sites. Which of the following describes how the network administrator can resolve this issue?

1. A. Correct the DNS server entries in the DHCP scope
2. B. Correct the external firewall gateway address
3. C. Correct the NTP server settings on the clients
4. D. Correct a TFTP Issue on the company’s server

Correct Answer: A
If multiple users in a new building are unable to access the company’s intranet site via their web browser but are able to access internet sites, the network administrator can resolve this issue by correcting the DNS server entries in the DHCP scope. The DHCP scope is responsible for assigning IP addresses and DNS server addresses to clients. If the DNS server entries are incorrect, clients will not be able to access intranet sites.
References:
CompTIA Network+ Certification Study Guide, Exam N10-007, Fourth Edition, Chapter 4: Network Implementations, Objective 4.4: Explain the purpose and properties of DHCP.

- (Exam Topic 3)
A network administrator wants to check all network connections and see the output in integer form. Which of the following commands should the administrator run on the command line?

1. A. netstat
2. B. netstat -a
3. C. netstat —e
4. D. netstat —n

Correct Answer: A

- (Exam Topic 3)
A WAN technician reviews activity and identifies newly installed hardware that is causing outages over an eight-hour period. Which of the following should be considered FIRST?

1. A. Network performance baselines
2. B. VLAN assignments
3. C. Routing table
4. D. Device configuration review

Correct Answer: D

- (Exam Topic 3)
An employee reports to a network administrator that internet access is not working. Which of the following should the administrator do FIRST?

1. A. Establish a theory of probable cause.
2. B. Identify symptoms.
3. C. Determine if anything has changed.
4. D. Ask the user to restart the computer.

Correct Answer: C
When a user reports that internet access is not working, it is important to first determine if there have been any recent changes to the network or the user's computer that could have caused the issue. This could include changes to the network configuration, the installation of new software or hardware, or other events that could have impacted the user's ability to access the internet. By determining if anything has changed, the administrator can narrow down the possible causes of the issue and focus on addressing the most likely cause.