An administrator needs to secure a wireless network and restrict access based on the hardware address of the device. Which of the following solutions should be implemented?
A. Use a stateful firewall B. Enable MAC filtering C. Upgrade to WPA2 encryption D. Force the WAP to use channel 1
Explanation: MAC addresses are also known as an Ethernet hardware address (EHA), hardware address or physical address. Enabling MAC filtering would allow for a WAP to restrict or allow access based on the hardware address of the device.
A company determines a need for additional protection from rogue devices plugging into physical ports around the building. Which of the following provides the highest degree of protection from unauthorized wired network access?
A. Intrusion Prevention Systems B. MAC filtering C. Flood guards D. 802.1x
Explanation: IEEE 802.1x is an IEEE Standard for Port-based Network Access Control (PNAC). It is part of the IEEE 802.1 group of networking protocols and provides an authentication mechanism to wireless devices connecting to a LAN or WLAN.
A computer is suspected of being compromised by malware. The security analyst examines the computer and finds that a service called Telnet is running and connecting to an external website over port 443. This Telnet service was found by comparing the system’s services to the list of standard services on the company’s system image. This review process depends on:
A. MAC filtering. B. System hardening. C. Rogue machine detection. D. Baselining.
Explanation: Application baseline defines the level or standard of security that will be implemented and maintained for the application. It may include requirements of hardware components, operating system versions, patch levels, installed applications and their configurations, and available ports and services. Systems can be compared to the baseline to ensure that the required level of security is being maintained.
A network engineer is setting up a network for a company. There is a BYOD policy for the employees so that they can connect their laptops and mobile devices. Which of the following technologies should be employed to separate the administrative network from the network in which all of the employees’ devices are connected?
A. VPN B. VLAN C. WPA2 D. MAC filtering
Explanation: A virtual local area network (VLAN) is a hardware-imposed network segmentation created by switches. VLANs are used for traffic management. Communications between ports within the same VLAN occur without hindrance, but communications between VLANs require a routing function.
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?
A. WEP B. WPA2 CCMP C. Disable SSID broadcast and increase power levels D. MAC filtering
Explanation: CCMP makes use of 128-bit AES encryption with a 48-bit initialization vector. This initialization vector makes cracking a bit more difficult.
A network administrator has been tasked with securing the WLAN. Which of the following cryptographic products would be used to provide the MOST secure environment for the WLAN?
A. WPA2 CCMP B. WPA C. WPA with MAC filtering D. WPA2 TKIP
Explanation: 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
Because CCMP is a block cipher mode using a 128-bit key, it is secure against attacks to the 264 steps of operation.
Which of the following best practices makes a wireless network more difficult to find?
A. Implement MAC filtering B. UseWPA2-PSK C. Disable SSID broadcast D. Power down unused WAPs
Explanation: Network administrators may choose to disable SSID broadcast to hide their network from unauthorized personnel. However, the SSID is still needed to direct packets to and from the base station, so it’s a discoverable value using a wireless packet sniffer. Thus, the SSID should be disabled if the network isn’t for public use.
Which of the following can be implemented if a security administrator wants only certain devices connecting to the wireless network?
A. Disable SSID broadcast B. Install a RADIUS server C. Enable MAC filtering D. Lowering power levels on the AP
Explanation: MAC filtering is commonly used in wireless networks. In computer networking, MAC Filtering (or GUI filtering, or layer 2 address filtering) refers to a security access control method whereby the 48-bit address assigned to each network card is used to determine access to the network. MAC addresses are uniquely assigned to each card, so using MAC filtering on a network permits and denies network access to specific devices through the use of blacklists and whitelists. While the restriction of network access through the use of lists is straightforward, an individual person is not identified by a MAC address, rather a device only, so an authorized person will need to have a whitelist entry for each device that he or she would use to access the network.
An administrator has a network subnet dedicated to a group of users. Due to concerns regarding data and network security, the administrator desires to provide network access for this group only. Which of the following would BEST address this desire?
A. Install a proxy server between the users’ computers and the switch to filter inbound network traffic. B. Block commonly used ports and forward them to higher and unused port numbers. C. Configure the switch to allow only traffic from computers based upon their physical address. D. Install host-based intrusion detection software to monitor incoming DHCP Discover requests.
Explanation: Configuring the switch to allow only traffic from computers based upon their physical address is known as MAC filtering. The physical address is known as the MAC address. Every network adapter has a unique MAC address hardcoded into the adapter. You can configure the ports of a switch to allow connections from computers with specific MAC addresses only and block all other MAC addresses. MAC filtering is commonly used in wireless networks but is considered insecure because a MAC address can be spoofed. However, in a wired network, it is more secure because it would be more difficult for a rogue computer to sniff a MAC address.