CompTIA Security+ Question L-48

Due to hardware limitation, a technician must implement a wireless encryption algorithm that uses the RC4 protocol. Which of the following is a wireless encryption solution that the technician should implement while ensuring the STRONGEST level of security?

B. 802.11ac

Answer: C

WPA-TKIP uses the RC4 cipher.

TKIP and the related WPA standard implement three new security features to address security problems encountered in WEP protected networks. First, TKIP implements a key mixing function that combines the secret root key with the initialization vector before passing it to the RC4 initialization. WEP, in comparison, merely concatenated the initialization vector to the root key, and passed this value to the RC4 routine. This permitted the vast majority of the RC4 based WEP related key attacks. Second, WPA implements a sequence counter to protect against replay attacks. Packets received out of order will be rejected by the access point. Finally, TKIP implements a 64-bit Message Integrity Check (MIC) To be able to run on legacy WEP hardware with minor upgrades, TKIP uses RC4 as its cipher. TKIP also provides a rekeying mechanism. TKIP ensures that every data packet is sent with a unique encryption key.

CompTIA Security+ Question L-46

Given the following list of corporate access points, which of the following attacks is MOST likely underway if the company wireless network uses the same wireless hardware throughout?
00:01:AB:FA:CD:34Corporate AP
00:01:AB:FA:CD:35Corporate AP
00:01:AB:FA:CD:36Corporate AP
00:01:AB:FA:CD:37Corporate AP
00:01:AB:FA:CD:34Corporate AP

A. Packet sniffing
B. Evil Twin
C. WPS attack
D. Rogue access point

Answer: B

CompTIA Security+ Question K-73

A company has recently implemented a high density wireless system by having a junior technician install two new access points for every access point already deployed. Users are now reporting random wireless disconnections and slow network connectivity. Which of the following is the MOST likely cause?

A. The old APs use 802.11a
B. Users did not enter the MAC of the new APs
C. The new APs use MIMO
D. A site survey was not conducted

Answer: D

To test the wireless AP placement, a site survey should be performed.

CompTIA Security+ Question K-17

The system administrator has been notified that many users are having difficulty connecting to the company’s wireless network. They take a new laptop and physically go to the access point and connect with no problems. Which of the following would be the MOST likely cause?

A. The certificate used to authenticate users has been compromised and revoked.
B. Multiple war drivers in the parking lot have exhausted all available IPs from the pool to deny access.
C. An attacker has gained access to the access point and has changed the encryption keys.
D. An unauthorized access point has been configured to operate on the same channel.

Answer: D

Wireless Access Points can be configured to use a channel. If you have multiple access points within range of each other, you should configure the access points to use different channels. Different channels use different frequencies. If you have two access points using the same channel, their Wi-Fi signals will interfere with each other. The question states that that many users are having difficulty connecting to the company’s wireless network. This is probably due to the signal being weakened by interference from another access point using the same channel. When the administrator takes a new laptop and physically goes to the access point and connects with no problems, he is able to connect because he is near the access point and therefore has a strong signal.

CompTIA Security+ Question K-14

A retail store uses a wireless network for its employees to access inventory from anywhere in the store. Due to concerns regarding the aging wireless network, the store manager has brought in a consultant to harden the network. During the site survey, the consultant discovers that the network was using WEP encryption. Which of the following would be the BEST course of action for the consultant to recommend?

A. Replace the unidirectional antenna at the front of the store with an omni-directional antenna.
B. Change the encryption used so that the encryption protocol is CCMP-based.
C. Disable the network’s SSID and configure the router to only access store devices based on MAC addresses.
D. Increase the access point’s encryption from WEP to WPA TKIP.

Answer: B

CCMP is the standard encryption protocol for use with the WPA2 standard and is much more secure than the WEP protocol and TKIP protocol of WPA. CCMP provides the following security services: Data confidentiality; ensures only authorized parties can access the information Authentication; provides proof of genuineness of the user Access control in conjunction with layer management

Incorrect Options:

A: The antenna type deals with signal strength and direction. It will not have a bearing on whether technology is older.

C: This option would “cloak” the network, not harden the network.

D: WPA2, which uses CCMP as its standard encryption protocol, more secure than WPA-TKIP.

Reference: Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 61, 63

CompTIA Security+ Question J-67

Which of the following is a step in deploying a WPA2-Enterprise wireless network?

A. Install a token on the authentication server
B. Install a DHCP server on the authentication server
C. Install an encryption key on the authentication server
D. Install a digital certificate on the authentication server

Answer: D

When setting up a wireless network, you’ll find two very different modes of Wi-Fi Protected Access (WPA) security, which apply to both the WPA and WPA2 versions. The easiest to setup is the Personal mode, technically called the Pre-Shared Key (PSK) mode. It doesn’t require anything beyond the wireless router or access points (APs) and uses a single passphrase or password for all users/devices. The other is the Enterprise mode —which should be used by businesses and organizations—and is also known as the RADIUS, 802.1X, 802.11i, or EAP mode. It provides better security and key management, and supports other enterprise-type functionality, such as VLANs and NAP. However, it requires an external authentication server, called a Remote Authentication Dial In User Service (RADIUS) server to handle the 802.1X authentication of users.

To help you better understand the process of setting up WPA/WPA2-Enterprise and 802.1X, here’s the basic overall steps: Choose, install, and configure a RADIUS server, or use a hosted service.

Create a certificate authority (CA), so you can issue and install a digital certificate onto the RADIUS server, which may be done as a part of the RADIUS server installation and configuration. Alternatively, you could purchase a digital certificate from a public CA, such as GoDaddy or Verisign, so you don’t have to install the server certificate on all the clients. If using EAP-TLS, you’d also create digital certificates for each end-user. On the server, populate the RADIUS client database with the IP address and shared secret for each AP. On the server, populate user data with usernames and passwords for each end-user. On each AP, configure the security for WPA/WPA2-Enterprise and input the RADIUS server IP address and the shared secret you created for that particular AP. On each Wi-Fi computer and device, configure the security for WPA/WPA2-Enterprise and set the 802.1X authentication settings.

CompTIA Security+ Question J-44

The security administrator has been tasked to update all the access points to provide a more secure connection. All access points currently use WPA TKIP for encryption. Which of the following would be configured to provide more secure connections?

C. Disable SSID broadcast and increase power levels
D. MAC filtering

Answer: B

CCMP makes use of 128-bit AES encryption with a 48-bit initialization vector. This initialization vector makes cracking a bit more difficult.

CompTIA Security+ Question I-54

The string:
‘ or 1=1– ­
Represents which of the following?

A. Bluejacking
B. Rogue access point
C. SQL Injection
D. Client-side attacks

Answer: C

The code in the question is an example of a SQL Injection attack. The code ‘1=1’ will always provide a value of true. This can be included in statement designed to return all rows in a SQL table.

SQL injection is a code injection technique, used to attack data-driven applications, in which malicious SQL statements are inserted into an entry field for execution (e.g. to dump the database contents to the attacker). SQL injection must exploit a security vulnerability in an application’s software, for example, when user input is either incorrectly filtered for string literal escape characters embedded in SQL statements or user input is not strongly typed and unexpectedly executed. SQL injection is mostly known as an attack vector for websites but can be used to attack any type of SQL database.

CompTIA Security+ Question I-49

A user has plugged in a wireless router from home with default configurations into a network jack at the office. This is known as:

A. an evil twin.
B. an IV attack.
C. a rogue access point.
D. an unauthorized entry point.

Answer: C

A rogue access point is a wireless access point that should not be there. In this question, the wireless router has been connected to the corporate network without authorization. Therefore, it is a rogue access point. A rogue access point is a wireless access point that has either been installed on a secure company network without explicit authorization from a local network administrator, or has been created to allow a hacker to conduct a man-in-the-middle attack. Rogue access points of the first kind can pose a security threat to large organizations with many employees, because anyone with access to the premises can install (maliciously or non-maliciously) an inexpensive wireless router that can potentially allow access to a secure network to unauthorized parties. Rogue access points of the second kind target networks that do not employ mutual authentication (client-server server-client) and may be used in conjunction with a rogue RADIUS server, depending on security configuration of the target network. To prevent the installation of rogue access points, organizations can install wireless intrusion prevention systems to monitor the radio spectrum for unauthorized access points.

CompTIA Security+ Question I-25

The practice of marking open wireless access points is called which of the following?

A. War dialing
B. War chalking
C. War driving
D. Evil twin

Answer: B

War chalking is the act of making chalk marks on outdoor surfaces (walls, sidewalks, buildings, sign posts, trees) to indicate the existence of an open wireless network connection, usually offering an Internet connection so that others can benefit from the free wireless access. The open connections typically come from the access points of wireless networks located within buildings to serve enterprises. The chalk symbols indicate the type of access point that is available at that specific spot.