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NEW QUESTION: 1
A security technician at a small business is worried about the Layer 2 switches in the network suffering from a DoS style attack caused by staff incorrectly cabling network connections between switches.
Which of the following will BEST mitigate the risk if implemented on the switches?
A. Syn flood
B. Access control lists
C. Flood guards
D. Spanning tree
Answer: D
Explanation:
Spanning Tree is designed to eliminate network 'loops' from incorrect cabling between switches. Imagine two switches named switch 1 and switch 2 with two network cables connecting the switches. This would cause a network loop. A network loop between two switches can cause a 'broadcast storm' where a broadcast packet is sent out of all ports on switch 1 which includes two links to switch 2. The broadcast packet is then sent out of all ports on switch 2 w hich includes links back to switch 1. The broadcast packet will be sent out of all ports on switch 1 again which includes two links to switch 2 and so on thus flooding the network with broadcast traffic.
The Spanning-Tree Protocol (STP) was created to overcome the problems of transparent bridging in redundant networks. The purpose of STP is to avoid and eliminate loops in the network by negotiating a loop-free path through a root bridge. This is done by determining where there are loops in the network and blocking links that are redundant.
Spanning-Tree Protocol executes an algorithm called the Spanning-Tree Algorithm (STA). In order to find redundant links, STA will choose a reference point called a Root Bridge, and then determines all the available paths to that reference point. If it finds a redundant path, it chooses for the best path to forward and for all other redundant paths to block. This effectively severs the redundant links within the network.
All switches participating in STP gather information on other switches in the network through an exchange of data messages. These messages are referred to as Bridge Protocol Data Units (BPDUs). The exchange of BPDUs in a switched environment will result in the election of a root switch for the stable spanning-tree network topology, election of designated switch for every switched segment, and the removal of loops in the switched network by placing redundant switch ports in a backup state.
Incorrect Answers:
B. Flood guards are used to prevent network flooding attacks such as DoS, SYN floods, ping floods etc. However, this question states that a security technician at a small business is worried about the Layer 2 switches in the network suffering from a DoS style attack caused by staff incorrectly cabling network connections between switches. Spanning tree is a more appropriate answer is this scenario.
C. Access control lists would not prevent a DoS style attack caused by staff incorrectly cabling network connections between switches. Switch traffic is not allowed or disallowed using Access control lists.
D. A SYN flood is a form of denial-of-service attack in which an attacker sends a succession of SYN requests to a target's system in an attempt to consume enough server resources to make the system unresponsive to legitimate traffic. It is not used to prevent a DoS style attack caused by staff incorrectly cabling network connections between switches.
References:
http://www.symantec.com/business/support/index?page=content&id=HOWTO6019
https://www.google.co.uk/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=syn%20flood
NEW QUESTION: 2
Given:
Which two allow a.Main to allocate a new Person? (Choose two.)
A. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
B. In Line 1, change the access modifier to privateprivate Person() {
C. In Line 1, change the access modifier to publicpublic Person() {
D. In Line 2, change the access modifier to protectedprotected class Main {
E. In Line 1, remove the access modifierPerson() {
Answer: A,E
NEW QUESTION: 3
Select the CORRECT statement about deploying custom mediator artifacts.
A. If you have developed your custom mediator as a regular non-OSGI JAR, you have to put it in the
<EI_HOME>/extensions directory.
B. If you have developedyour custom mediator as an OSGI bundle, you have to put it in the
<EI_HOME>/dropins directory.
C. If itis a class mediator, you can put that JAR file in the <EI_HOME>/lib directory.
D. All of the above.
Answer: B
NEW QUESTION: 4
Scenario: A Citrix Administrator updates all of the machines within a Delivery Group. After
the update, an application stops working. The IT manager tells the administrator to revert all machines to the previous image.
How should the administrator revert allmachines to the previous image?
A. By selecting 'Rollback machine update' for the Delivery Group
B. By deleting the snapshot associated with the template virtual machine
C. By selecting 'Rollback machine update' for the Session Machine Catalog
D. By deleting the difference disks of the virtual machines within the Delivery Group
Answer: C