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NEW QUESTION: 1
Which two of the following provide protect against man-in-the-middle attacks? (Choose two.)
A. IPsec VPNs
B. Secure Sockets Layer
C. Network Address Translation
D. TCP sliding-window checking
E. TCP initial sequence number randomization?
Answer: A,B
Explanation:
IPSec prevents packet modification to thwart man-in-the-middle attacks. However, this strong security feature also generates operational problems. NAT frequently breaks IPSec because it modifies packets by substituting public IP addresses for private ones. Many IPSec products implement NAT traversal extensions, but support for this feature isn't universal, and interoperability is still an issue. SSL is almost as tough against man-in-the-middle attacks, without IPSec's NAT conflict. SSL rides on TCP, so it's insulated from IP and port modifications, and thus passes easily through NAT. SSL carries sequence numbers inside encrypted packets to prevent packet injection, and TLS uses message authentication to detect payload changes.
NEW QUESTION: 2
If you change the native VLAN on the trunk port to an unused VLAN, what happens if an attacker attempts a double-tagging attack?
A. The trunk port would go into an error-disabled state.
B. A VLAN hopping attack would be prevented.
C. The attacked VLAN will be pruned.
D. A VLAN hopping attack would be successful.
Answer: B
Explanation:
Explanation
VLAN hopping is a computer security exploit, a method of attacking networked resources on a virtual LAN (VLAN). The basic concept behind all VLAN hopping attacks is for an attacking host on a VLAN to gain access to traffic on other VLANs that would normally not be accessible. There are two primary methods of VLAN hopping: switch spoofing and double tagging.
Double Tagging can only be exploited when switches use "Native VLANs". Double Tagging can be mitigated by either one of the following actions:
+ Simply do not put any hosts on VLAN 1 (The default VLAN)
+ Change the native VLAN on all trunk ports to an unused VLAN ID Source:
https://en.wikipedia.org/wiki/VLAN_hopping
NEW QUESTION: 3
You are writing a client that sends a message to a JMS queue.
What two statements are true?
A. You can use resource injection to access a JMS destination from a servlet.
B. You cannot use a JNDI lookup to access a JMS destination from a session bean.
C. You must use a JNDI lookup to access a JMS destination from a standalone Java class.
D. You cannot use resource injection to access a JMS destination from a Java EE application client.
Answer: A,C
Explanation:
Explanation/Reference:
B: In addition to injecting a connection factory resource into a client program, you usually inject a destination resource. Unlike connection factories, destinations are specific to one domain or the other.
Note:
* A destination is the object a client uses to specify the target of messages it produces and the source of messages it consumes. In the PTP messaging domain, destinations are called queues. In the pub/sub messaging domain, destinations are called topics.
* In addition to looking up a connection factory in a client program, you usually look up a destination. Unlike connection factories, destinations are specific to one domain or the other. To create an application that allows you to use the same code for both topics and queues, you cast and assign the destination to a Destination object. To preserve the semantics of queues and topics, however, you cast and assign the object to a destination of the appropriate type.
For example, the following line of code performs a JNDI lookup of the previously created topic jms/MyTopic and casts and assigns it to a Destination object:
Destination myDest = (Destination) ctx.lookup("jms/MyTopic");
The following line of code looks up a queue named jms/MyQueue and casts and assigns it to a Queue object:
Queue myQueue = (Queue) ctx.lookup("jms/MyQueue");
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