CompTIA Network+ Question A-17

Which of the following devices implements CSMA/CA virtually through the RTS/CTS protocols?

A. Firewall
B. Router
C. 802.11 AP
D. Switch

Correct Answer: C

Explanation:
802.11 AP is a Wireless Access Point used in a wireless network.
If two computers on a network send data frames at the same time, a collision between the frames can occur. The frames are then discarded and the sending computers will attempt to send the data again.
Carrier sense multiple access with collision avoidance (CSMA/CA) is a protocol used in wireless networks where computers connected to the wireless network attempt to avoid collisions by transmitting data only when the channel is sensed to be “idle”. Carrier Sense Multiple Access/Collision Detect (CSMA/CD) is unreliable in wireless networks because computers connected to the wireless network often cannot see each other so CSMA/CA is a better option for avoiding collisions.
Request to Send/Clear to Send (RTS/CTS) can also be used to mediate access to the wireless network. This goes some way to alleviating the problem of computers not being able to see each other because in a wireless network, the Wireless Access Point only issues a “Clear to Send” to one node at a time.
With RTS/CTS, a Request to Send (RTS) packet is sent by the sending computer, and a Clear to Send (CTS) packet is sent by the intended receiver. This will alert all computers within range of the sender, receiver or both, to not transmit for the duration of the transmission. This is known as the IEEE 802.11 RTS/CTS exchange.

CompTIA Network+ Simulation 13

You have been tasked with setting up a wireless network in an office. The network will consist of 3 access points and a single switch. The network must meet the following parameters.

The SSIDs need to be configured as corpnet with a key of S3cr3t! The wireless signals should not interfere with each other.

The subnet the Access points and Switch are on should only support 30 devices maximum The access Points should be configured to only support TKIP clients at a maximum speed

Instructions: Click on the devices to review their information and adjust the setting of the APs to meet the given requirements.

Correct Answer:

Exhibit 1 as follows
Access Point Name: AP1
IP Address: 192.168.1.3
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 1
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!

Exhibit 2 as follows
Access Point Name: AP2
IP Address: 192.168.1.4
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 6
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!

Exhibit 3 as follows
Access Point Name: AP3
IP Address: 192.168.1.5
Gateway: 192.168.1.2
SSID: corpnet
SSID Broadcast: yes
Mode: G
Channel: 11
Speed: Auto
Duplex: Auto
WPA Passphrase: S3cr3t!

CompTIA Network+ Simulation 6

Wireless network users recently began experiencing speed and performance issues after access point 2 (AP2) was replaced due to faulty hardware. The original network was installed according to a consultant’s specifications and has always worked without a problem.

You a network technician, have been tasked with evaluating the situation and resolving the issues to improve both performance and connectivity. Refer to the following exhibits and perform any necessary changes to the wireless and wired infrastructure by adjusting devices. Note: Adjust the LEAST number of devices needed to fix the issue.

Select and Place:

Correct Answer:


After you fix AP2, you must click on the switch, which will bring up the switch interface. Type in the two commands that they show there, to prove the fix. Do not worry that interface 4 is down, there is no interface 4 for you to do

CompTIA Network+ Simulation 5

Your company recently purchased a new building down the street from the existing office. For each of the tasks below, select the appropriate antenna type and encryption object for all wireless access point (AP).
1. Create an encrypted wireless connection between the two buildings that BEST controls signal propagation, while maximizing security.
2. Restrict the wireless signal generated by the access points (AP’s) inside Building 1, so that it minimizes broadcast beyond the building.
3. Maximize wireless coverage inside Building 1.
4. Building 1’s internal wireless network is for visitors only and must not require any special configuration on the visitor’s device to connect.

Select and Place:

Correct Answer:

CompTIA A+ Core 2 Question J-73

A user, Jane, reports that her laptop will no longer connect to wireless. Peter, a technician, checks the device manager and does not see a wireless networking card or any unknown devices. Which of the following should Peter do FIRST?

A. Check to make sure the wireless card was not turned off via the hardware switch or keyboard shortcut.
B. Install a USB wireless card to ensure that Windows networking is working properly.
C. Open the laptop and reseat the network card and both antennas.
D. Download and install the latest wireless driver from the manufacturers website.

Correct Answer: A

Explanation:
If the wireless networking card is functioning properly, check the wireless switch on the laptop and see if the wireless is enabled within the operating system.

CompTIA A+ Core 2 Question J-36

A client requests a small SOHO wireless network setup. The client has only three devices that will require access to the Internet. The client is also concerned that a neighboring business will attempt to access the Internet without permission. Which of the following should the technician ensure when setting up the SOHO network? (Select TWO).

A. Enable client isolation
B. Lower radio power levels
C. Physically secure the access point
D. Disable unused ports
E. Enable MAC filtering
F. Enable short preambles

Correct Answer: BE

CompTIA A+ Core 2 Question J-13

A technician is trying to prevent a local application from reaching the web due to security concerns. Which of the following solutions could BEST prevent the application from reaching the web? (Select TWO).

A. Configure the workstation for a static IP
B. Disable all wireless network connections
C. Remove shortcuts to the application
D. Block the application in Windows Firewall
E. Change network location to Work
F. Reroute the web address in HOSTS file

Correct Answer: DF

Explanation:
Use Windows firewall to restrict an application from reaching the web. Alternatively you can also reroute the web address in the HOST file.

CompTIA A+ Core 2 Question H-81

A user is reporting that they cannot connect to the wireless network from their office but they were able to connect yesterday. Which of the following would be the MOST likely reason?

A. Radio switch on laptop is enabled
B. Radio switch on laptop is disabled
C. Channel interference
D. User is too far away from the access point