- (Topic 3)
A computer engineer needs to ensure that only a specific workstation can connect to port 1 on a switch. Which of the following features should the engineer configure on the switch interface?

Correct Answer:B
Port security is a feature that can be configured on a switch interface to limit and identify the MAC addresses of workstations that are allowed to connect to that specific port. This can help ensure that only a specific workstation (or workstations) can connect to the interface. According to the CompTIA Network+ Study Manual, “Port security can be used to specify which MAC addresses are allowed to connect to a particular switch port. If a port security violation is detected, the switch can take a number of different actions, such as shutting down the port, sending an SNMP trap, or sending an email alert.”

- (Topic 3)
Which of the following would be the BEST choice to connect branch sites to a main office securely?

Correct Answer:A
Host-to-Site, or Client-to-Site, VPN allows for remote servers, clients, and other hosts to establish tunnels through a VPN gateway (or VPN headend) via a private network. The tunnel between the headend and the client host encapsulates and encrypts data.

- (Topic 3)
A company is opening a new building on the other side of its campus. The distance from the closest building to the new building is 1,804ft (550m). The company needs to connect the networking equipment in the new building to the Other buildings on the campus without using a repeater. Which Of the following transceivers should the company use?

Correct Answer:B
10GBASE-LR is a standard for 10 Gbps Ethernet over single-mode fiber optic cable. It can support a maximum distance of 6.2 miles (10 km), which is much longer than the distance between the buildings. 10GBASE-SW, 10GBASE-LX4, and 10GBASE- SR are all standards for 10 Gbps Ethernet over multimode fiber optic cable, which have shorter maximum distances ranging from 984ft (300m) to 1,312ft (400m).
References: CompTIA Network+ Certification Exam Objectives Version 7.0 (N10-007), Objective 1.5: Compare and contrast network cabling types, standards and speeds.

- (Topic 1)
A technician is writing documentation regarding a company’s server farm. The technician needs to confirm the server name for all Linux servers. Which of the following commands should the technician run?

Correct Answer:B
The nslookup command should be run to confirm the server name for all Linux servers. Nslookup is a tool that queries DNS servers to resolve hostnames to IP addresses or vice versa. It can also provide other information about DNS records, such as MX, NS, SOA, etc. By running nslookup with the IP address of a Linux server, the technician can obtain its hostname. References: https://www.howtogeek.com/663056/how- to-use-the-nslookup-command-on-linux/

- (Topic 3)
A company wants to set up a backup data center that can become active during a disaster. The site needs to contain network equipment and connectivity. Which of the following strategies should the company employ?

Correct Answer:B
Active-active refers to more than one NIC being active at the same time. In my opinion, this question is referring to a recovery site (hot, warm, cold, cloud)

- (Topic 3)
A junior network administrator is auditing the company network and notices incrementing input errors on a long-range microwave interface. Which of the following is the most likely reason for the errors?

Correct Answer:A
A long-range microwave interface is a type of wireless communication that uses high- frequency radio waves to transmit and receive data over long distances. A long-range microwave interface typically uses a parabolic antenna, also known as a dish antenna, to focus the radio waves into a narrow beam that can travel farther and with less interference than an omnidirectional antenna, which radiates the radio waves in all directions1.
One of the most common causes of input errors on a long-range microwave interface is the misalignment of the parabolic antenna. Input errors are errors that occur when the receiver cannot properly decode or process the incoming signal. If the parabolic antenna is not aligned correctly with the transmitter, the receiver may not be able to capture the full strength of the signal, or it may pick up unwanted noise or interference from other sources. This can result in corrupted or lost data, which will increase the input error count23.
To troubleshoot this issue, the junior network administrator should check the alignment of the parabolic antenna and make sure it is pointing directly at the transmitter. The administrator can use tools such as a spectrum analyzer, a signal strength meter, or a path alignment tool to measure and adjust the signal quality and alignment of the antenna24. The other options are not likely reasons for the input errors on a long-range microwave interface. A long-range microwave interface does not use an omnidirectional signal, so it cannot be jammed or weakened by other sources. The parabolic signal does not depend on the routing protocols used by the network, so it cannot be affected by improper routing protocols.