CompTIA A+ Core 2 Question J-79

Which of the following should a technician implement to prevent external contractors from physically plugging devices into the company’s network jacks unless such jacks are designated for guest use?

A. Disable DHCP and assign a static IP address to each network device physically connected to the network.
B. Enable MAC address filtering across all network jacks and record the MAC address of guest devices.
C. Disable all switch ports when they are not utilized and enable them on an as needed basis.
D. Place guest network jacks in public areas and all other jacks in secure areas as needed.

Correct Answer: C

CompTIA A+ Core 2 Question G-94

A user attempts to remote into their machine at night but cannot connect. The user believes that someone is unplugging their computer from the network at night and plugging in a personal machine. Which of the following security measures would BEST prevent this behavior from continuing?

A. Limit the port to a specific MAC address.
B. Set the port to only activate during business hours.
C. Disable DHCP on the network router.
D. Deactivate the port that is being used from the switch.

Correct Answer: A

CompTIA A+ Core 2 Question G-40

A technician is configuring a PC that will have confidential information stored on it. To ensure that only authorized users can access this PC, which of the following should the technician do? (Select TWO).

A. Disable the guest account
B. Install antivirus applications
C. Disable DHCP
D. Change the SSID
E. Change the default username

Correct Answer: AE

Explanation:
To prevent unauthorized access to the PC, disable guest accounts and change default usernames for maximum security.

CompTIA A+ Core 2 Question D-93

Which of the following should a technician implement to prevent external contractors from physically plugging devices into the company’s network jacks unless such jacks are designated for guest use?

A. Disable DHCP and assign a static IP address to each network device physically connected to the network.
B. Enable MAC address filtering across all network jacks and record the MAC address of guest devices.
C. Disable all switch ports when they are not utilized and enable them on an as needed basis.
D. Place guest network jacks in public areas and all other jacks in secure areas as needed.

Correct Answer: C

Explanation:
The best way is to disable all switch ports when they are not utilized. Switch them on when you need them. This way, you can prevent external contractors from physically plugging devices in to company’s network jacks.

CompTIA A+ Question G-33

A computer technician is installing a new wireless router for a small office. The office already has an internal device that assigns addresses to users. Which of the following functions needs to be disabled on the router to prevent conflicts?

A. DMZ capability
B. MAC filtering capability
C. Network Address Translation
D. DHCP server functionality

Correct Answer: D

Explanation:
DHCP automatically assigns IP address, subnet mask and default gateway to provide access to workstations. Disable DHCP server before installing a wireless router so that you can configure it without DHCP assigning IP addresses to other computers.