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NEW QUESTION: 1
Which of the following is a type of attack that can be mitigated by enabling DAI on campus access layer switches?
A. VLAN hopping
B. MAC flooding
C. DHCP spoofing
D. ARP poisoning
Answer: D
Explanation:
Explanation/Reference:
Section: Considerations for Expanding an Existing Network Explanation
Explanation:
Dynamic ARP Inspection (DAI) can be enabled on campus access layer switches to mitigate Address Resolution Protocol (ARP) poisoning attacks. In an ARP poisoning attack, which is also known as an ARP spoofing attack, the attacker sends a gratuitous ARP (GARP) message to a host. The message associates the attacker's media access control (MAC) address with the IP address of a valid host on the network.
Subsequently, traffic sent to the valid host address will go through the attacker's computer rather than directly to the intended recipient. DAI protects against ARP poisoning attacks by inspecting all ARP packets that are received on untrusted ports.
Dynamic Host Configuration Protocol (DHCP) spoofing attacks can be mitigated by enabling DHCP snooping on campus access layer switches, not by enabling DAI. In a DHCP spoofing attack, an attacker installs a rogue DHCP server on the network in an attempt to intercept DHCP requests. The rogue DHCP server can then respond to the DHCP requests with its own IP address as the default gateway address?
hence all traffic is routed through the rogue DHCP server. DHCP snooping is a feature of Cisco Catalyst switches that helps prevent rogue DHCP servers from providing incorrect IP address information to hosts on the network. When DHCP snooping is enabled, DHCP servers are placed onto trusted switch ports and other hosts are placed onto untrusted switch ports. If a DHCP reply originates from an untrusted port, the port is disabled and the reply is discarded.
Virtual LAN (VLAN) hopping attacks can be mitigated by disabling Dynamic Trunking Protocol (DTP) on campus access layer switches, not by enabling DAI. A VLAN hopping attack occurs when a malicious user sends frames over a VLAN trunk link? the frames are tagged with two different 802.1Q tags, with the goal of sending the frame to a different VLAN. In a VLAN hopping attack, a malicious user connects to a switch by using an access VLAN that is the same as the native VLAN on the switch. If the native VLAN on a switch were VLAN 1, the attacker would connect to the switch by using VLAN 1 as the access VLAN. The attacker would transmit packets containing 802.1Q tags for the native VLAN and tags spoofing another VLAN. Each packet would be forwarded out the trunk link on the switch, and the native VLAN tag would be removed from the packet, leaving the spoofed tag in the packet. The switch on the other end of the trunk link would receive the packet, examine the 802.1Q tag information, and forward the packet to the destination VLAN, thus allowing the malicious user to inject packets into the destination VLAN even though the user is not connected to that VLAN.
To mitigate VLAN hopping attacks, you should configure the native VLAN on a switch to an unused value, remove the native VLAN from each end of the trunk link, place any unused ports into a common unrouted VLAN, and disable DTP for unused and nontrunk ports. DTP is a Cisco-proprietary protocol that eases administration by automating the trunk configuration process. However, for nontrunk links and for unused ports, a malicious user who has gained access to the port could use DTP to gain access to the switch through the exchange of DTP messages. By disabling DTP, you can prevent a user from using DTP messages to gain access to the switch.
MAC flooding attacks can be mitigated by enabling port security on campus access layer switches, not by enabling DAI. In a MAC flooding attack, an attacker generates thousands of forged frames every minute with the intention of overwhelming the switch's MAC address table. Once this table is flooded, the switch can no longer make intelligent forwarding decisions and all traffic is flooded. This allows the attacker to view all data sent through the switch because all traffic will be sent out each port. Implementing port security can help mitigate MAC flooding attacks by limiting the number of MAC addresses that can be learned on each interface to a maximum of 128. A MAC flooding attack is also known as a Content Addressable Memory (CAM) table overflow attack.
Reference:
CCDA 200-310 Official Cert Guide, Chapter 12, Loss of Availability, pp. 495-496 Cisco: Layer 2 Security Features on Cisco Catalyst Layer 3 Fixed Configuration Switches Configuration Example: Background Information
Cisco: Enterprise Data Center Topology: Preventing VLAN Hopping
NEW QUESTION: 2
Which unit of measurement does the HPE Synergy Planning Tool provide for the cooling requirements of a given configuration?
A. BTU
B. W
C. VA
D. A
Answer: B
NEW QUESTION: 3
You are creating a SQL Server 2008 Reporting Services (SSRS) solution for a company that has offices in
different countries. The company has a data server for each country. Sales data for each country is
persisted in the respective data server for the country. Report developers have only Read access to all data
servers. All data servers have the same schema for the database.
You design an SSRS solution to view sales data.
You need to ensure that users are able to easily switch between sales data for different countries.
What should you do?
A. Implement an embedded data source that has an expression-based connection string.
B. Implement an embedded data source that has a static connection string.
C. Implement a single shared data source.
D. Implement multiple shared data sources.
Answer: A